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This document provides instructions for downloading, installing, and using the QGIS mapping software. It includes steps for opening shapefiles in QGIS, changing background colors, labeling districts, assigning unique colors to each district, classifying boro production data, and exporting maps. Screenshots accompany the text instructions to illustrate each mapping task.
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#1 guidelines for expression of stable isotope ratio results
This document provides guidelines for expressing stable isotope measurement results in a clear and consistent manner. It aims to clarify terminology related to isotope ratios and relative differences in isotope ratios. Key recommendations include using the delta (δ) notation to express relative differences compared to a standard, specifying the isotope when using terms like "depleted" or "enriched", and following International System of Units guidelines for formatting numbers, units, and uncertainty values. The guidelines are intended to improve communication of isotopic data across scientific disciplines.
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This document provides a guide for isotope ratio mass spectrometry (IRMS). It describes the key components and functioning of elemental analyzer IRMS (EA-IRMS) and thermal conversion EA-IRMS systems. These systems involve converting samples to simple gases like CO2, N2, CO, and H2 using an elemental analyzer, then introducing the gases into a mass spectrometer for isotope ratio analysis. The guide outlines instrument setup, calibration, making measurements, data handling procedures, quality assurance, and troubleshooting topics to help users reliably obtain isotope ratio data.
#1 isotope guidelines coplen 2011
This document provides guidelines for expressing stable isotope measurement results in a clear and consistent manner. It aims to clarify terminology related to isotope ratios and relative differences in isotope ratios. Key recommendations include using the delta (δ) notation to express relative differences compared to a reference standard, and specifying the isotope when using terms like "depleted" or "enriched". Measurement results should include associated uncertainties and be reported in a way consistent with international standards for quantities and units. The guidelines are intended to improve communication in scientific fields involving stable isotope measurements.
#1 stable isotope deltas tiny yet robust signatures in nature
This document discusses stable isotope deltas, which are tiny yet robust signatures that can be measured in nature. It explains that two fundamental processes, isotopic fractionation and isotope mixing, are responsible for most stable isotope variations seen in terrestrial systems. Isotopic fractionation occurs through equilibrium or kinetic processes that fractionate isotopes due to small differences in their physical or chemical properties. Isotope mixing models can provide information about processes like 14C abundances in the atmosphere and past ocean isotopic compositions. The document also proposes a new unit called the "urey" to describe isotope deltas in a way that overcomes limitations of traditional units.
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This document describes a method for determining the stable isotope ratios (d18O and d13C) of water and dissolved inorganic carbon using an elemental analyzer coupled to an isotope ratio mass spectrometer. Small amounts of water sample are equilibrated with CO2 gas in sealed vials. The headspace CO2 is then injected into the elemental analyzer for analysis. The method requires only a simple modification to the elemental analyzer and provides precise results without extensive offline sample preparation. Reproducible results with a precision of better than 0.2% can be obtained for both water isotope and dissolved inorganic carbon ratios using this coupled approach.
13 c analyses of calcium carbonate comparison between gb and ea
This document compares the GasBench and elemental analyzer techniques for analyzing the stable carbon isotope composition (d13C) of calcium carbonate samples. It analyzed the d13C of two in-house carbonate standards and ten paleosol samples using both techniques. The results found that for pure calcium carbonate samples, both techniques produced similar d13C values with comparable precision of better than 0.08%. However, the GasBench technique generally had slightly better precision, especially for samples with less than 85% calcium carbonate content. The study suggests the elemental analyzer technique can also be used to analyze the d13C of pure calcium carbonate samples.
13 doc analysis technique - isotope tracer tech inc
Samples are prepared for 13C analysis of dissolved organic carbon by adding phosphoric acid and potassium persulfate to water samples to expel inorganic carbon and digest organic carbon. Samples are then flushed with helium and microwaved to completely release carbon dioxide. Samples are analyzed using continuous flow isotope ratio mass spectrometry where a sample aliquot is injected and analyzed by comparing isotopic ratios to a reference gas. Three internal carbon standards are prepared and analyzed under the same conditions as samples to calibrate results reported against an international reference material.
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This document reviews normalization procedures and reference material selection for stable isotope analyses. It discusses that normalization methods using linear regression based on two or more reference standards are preferred over single-point normalization or normalization to a working gas. Using multiple reference standards that span the expected range of sample δ values and performing replicate measurements can reduce uncertainty by 50%. While chemical matching between reference materials and samples is important for some materials and techniques, like δ18O of nitrate or δ2H of hair, it is not always necessary. To ensure comparability, laboratories should report details of their normalization procedures and reference materials.
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This document provides guidelines for expressing stable isotope measurement results in a clear and consistent manner. It aims to clarify terminology related to isotope ratios and relative differences in isotope ratios. Key recommendations include using the delta (δ) notation to express relative differences compared to a reference standard, and specifying the isotope when using terms like "depleted" or "enriched". Measurement results should include associated uncertainties and be reported in a way consistent with international standards for quantities and units. The guidelines are intended to improve communication in scientific fields involving stable isotope measurements.
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This document discusses stable isotope deltas, which are tiny yet robust signatures that can be measured in nature. It explains that two fundamental processes, isotopic fractionation and isotope mixing, are responsible for most stable isotope variations seen in terrestrial systems. Isotopic fractionation occurs through equilibrium or kinetic processes that fractionate isotopes due to small differences in their physical or chemical properties. Isotope mixing models can provide information about processes like 14C abundances in the atmosphere and past ocean isotopic compositions. The document also proposes a new unit called the "urey" to describe isotope deltas in a way that overcomes limitations of traditional units.
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This document describes a method for determining the stable isotope ratios (d18O and d13C) of water and dissolved inorganic carbon using an elemental analyzer coupled to an isotope ratio mass spectrometer. Small amounts of water sample are equilibrated with CO2 gas in sealed vials. The headspace CO2 is then injected into the elemental analyzer for analysis. The method requires only a simple modification to the elemental analyzer and provides precise results without extensive offline sample preparation. Reproducible results with a precision of better than 0.2% can be obtained for both water isotope and dissolved inorganic carbon ratios using this coupled approach.
13 c analyses of calcium carbonate comparison between gb and ea
This document compares the GasBench and elemental analyzer techniques for analyzing the stable carbon isotope composition (d13C) of calcium carbonate samples. It analyzed the d13C of two in-house carbonate standards and ten paleosol samples using both techniques. The results found that for pure calcium carbonate samples, both techniques produced similar d13C values with comparable precision of better than 0.08%. However, the GasBench technique generally had slightly better precision, especially for samples with less than 85% calcium carbonate content. The study suggests the elemental analyzer technique can also be used to analyze the d13C of pure calcium carbonate samples.
13 doc analysis technique - isotope tracer tech inc
Samples are prepared for 13C analysis of dissolved organic carbon by adding phosphoric acid and potassium persulfate to water samples to expel inorganic carbon and digest organic carbon. Samples are then flushed with helium and microwaved to completely release carbon dioxide. Samples are analyzed using continuous flow isotope ratio mass spectrometry where a sample aliquot is injected and analyzed by comparing isotopic ratios to a reference gas. Three internal carbon standards are prepared and analyzed under the same conditions as samples to calibrate results reported against an international reference material.
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This document reviews normalization procedures and reference material selection for stable isotope analyses. It discusses that normalization methods using linear regression based on two or more reference standards are preferred over single-point normalization or normalization to a working gas. Using multiple reference standards that span the expected range of sample δ values and performing replicate measurements can reduce uncertainty by 50%. While chemical matching between reference materials and samples is important for some materials and techniques, like δ18O of nitrate or δ2H of hair, it is not always necessary. To ensure comparability, laboratories should report details of their normalization procedures and reference materials.
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This document describes 19 new organic reference materials developed for hydrogen, carbon, and nitrogen stable isotope ratio measurements, in addition to analyzing 3 pre-existing reference materials. The new reference materials span a wide range of isotope values and include materials like caffeines, n-alkanes, fatty acid methyl esters, glycines, L-valines, polyethylenes, and oils. Eleven laboratories from 7 countries performed isotope ratio measurements of the materials using multiple analytical techniques. Bayesian statistical analysis was used to determine the mean isotope values for each material. The new reference materials will enable normalization of sample measurements to international isotope scales.
Absolute isotopic scale for deuterium analysis of natural waters
This document defines an absolute isotopic scale for deuterium analysis of natural waters based on measurements of two reference standards - Standard Mean Ocean Water (SMOW) and Standard Light Antarctic Precipitation (SLAP). The absolute D/H ratios were measured through mass spectrometric comparison with calibration mixtures prepared in the laboratory. The results obtained are:
1) The absolute D/H ratio of SMOW is 155.76 ± 0.05 x 10-6.
2) The absolute D/H ratio of SLAP is 89.02 ± 0.05 x 10-6.
3) The δD value of SLAP relative to SMOW is -428.50 ±
Acid fumigation preparing c-13 solid samples for organic analysis
1) The document provides tips for preparing difficult soil, sediment, filter, wood, and carbonate samples for 13C and 15N analysis, including removing inorganic carbonates from calcareous samples.
2) It recommends weighing samples into silver capsules, placing them in an acid desiccator to release carbon dioxide from carbonates over 6-8 hours, then drying and re-encapsulating samples in tin capsules for combustion.
3) The additional tin capsule acts as an important combustion catalyst and prevents leaks that could lose sample material during crimping.
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This document describes a method for removing carbonates from soil samples prior to isotopic analysis of total organic carbon or carbon-13. It compares the effectiveness of acid fumigation using hydrochloric acid vapor versus acid washing. The key findings are:
1) Hydrochloric acid fumigation is highly effective at removing carbonates from soils, does not remove water-soluble organic carbon, and does not alter the carbon-13 signature of the residual soil organic matter.
2) Acid washing soils with hydrochloric acid, while removing carbonates, results in significant losses of total soil carbon and nitrogen as well as changes to the carbon-13 signature.
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Carbonate removal by acid fumigation for measuring 13 c
This study evaluated a method of removing carbonates from soil samples using acid fumigation to allow for accurate measurement of soil organic carbon concentrations and isotopic signatures. Soil samples from two depths were exposed to hydrochloric acid vapors for varying time periods. Analysis found that a minimum of 30 hours of exposure was needed to remove all carbonates from surface soil samples containing 0.80% inorganic carbon, while 56 hours was required for subsurface samples containing 1.94% inorganic carbon. The rate of inorganic carbon removal was similar to previous studies. A correction factor was also used to account for mass changes during fumigation to allow accurate determination of soil organic carbon concentrations.
Carbonate removal from coastal sediments for the determination of organic c a...
The document compares two methods for removing inorganic carbon from samples to isolate organic carbon for analysis: the aqueous method using hydrochloric acid (HClaq) and the vaporous method using hydrochloric acid vapor (HClvap). It evaluates the methods based on their ability to have low blank levels, efficiently remove dolomite, yield accurate measurements of organic carbon percentage and isotopic signatures (δ13C and Δ14C). The vaporous method met all criteria if samples were not overexposed to acid. The aqueous method gave similar results but was less reliable and consistently underestimated organic carbon percentage. Optimal acid exposure times need to be determined for each sample type to obtain the most accurate isotopic measurements.
Forensic application of irms
This document provides an overview of stable isotope ratio mass spectrometry (IRMS) and its forensic applications. IRMS is a technique that can help distinguish between sources of the same substance. It does this by measuring the natural variations in isotope ratios present due to fractionation effects during chemical and physical processes. The document reviews how IRMS has been used to individualize samples in cases involving explosives, ignitable liquids, and illicit drugs. It also discusses the delta notation and standards used to report isotope ratio data and the kinetic and thermodynamic fractionation effects that create characteristic isotope ratio signatures.
Improved method for analysis of dic in natural water samples
This improved method allows for the isotopic and quantitative analysis of dissolved inorganic carbon (DIC) in natural water samples. It involves injecting an aliquot of water into a glass tube containing phosphoric acid, which converts the DIC into gaseous and aqueous carbon dioxide. After 15-24 hours of equilibration, a portion of the headspace gas, mainly carbon dioxide, is introduced into a gas chromatograph coupled to an isotope ratio mass spectrometer to measure the carbon isotope ratio and determine the δ13C value of DIC. Standard solutions are used to calibrate the method and account for carbon isotope fractionation between gaseous and aqueous carbon dioxide phases. The method can analyze around 50 samples per day and
Introduction to isotopic calculation
This document provides an introduction to isotopic calculations, including:
- Methods for expressing isotopic abundances using terms like atom percent and fractional abundance.
- Isotopic mass balance calculations for combinations of materials and isotope dilution analyses.
- The delta notation used to express differences in isotopic composition between samples.
- How fractionations between isotopes can provide information about isotope effects and processes samples have undergone.
- How the reversibility of reactions and whether systems are open or closed impact isotopic distributions between reactants and products at equilibrium.
Isotope ratio mass spectrometry minireview
Isotope ratio mass spectrometry (IRMS) is a technique that determines the relative abundances of isotopes in a sample to find its geographic, chemical, and biological origins. Variations in isotope ratios of elements like carbon, hydrogen, oxygen, sulfur, and nitrogen occur through kinetic and thermodynamic processes and can differentiate between chemically identical samples. IRMS instruments precisely measure subtle differences in natural isotope abundances to provide information in many fields. Sample introduction is usually through elemental analyzers, gas chromatography, or liquid chromatography interfaced with an IRMS instrument.
Measurement of slap2 and gisp 17 o and proposed vsmow slap normalization
The document presents new measurements of the δ17O values of SLAP2 and GISP ice core water samples. It aims to establish a standardized δ17O value for SLAP to improve normalization and reduce discrepancies in reported δ17O and 17Oexcess values between laboratories. The authors measured the samples on a mass spectrometer and recommend defining SLAP to have δ18O = -55.5‰ and 17Oexcess = 0, yielding an approximate δ17O value of -29.6968‰. Using this normalization, their measured values of GISP were δ17O = -13.16 ± 0.05‰ and 17Oexcess = 22 ± 11 per meg. They conclude
Method of sampling and analysis of 13 c dic in groundwaters
This document describes a new method for analyzing the stable carbon isotopic composition (δ13C) of dissolved inorganic carbon (DIC) in groundwater samples. The method uses a gas evolution technique where water samples are injected into vials containing phosphoric acid, which causes the DIC to evolve as CO2 gas. The vials are then analyzed using an automated continuous-flow gas preparation system coupled to an isotope ratio mass spectrometer. This allows for fast (10 minute) analysis of DIC δ13C with high precision (0.1‰) and accuracy. The method is robust, requires minimal field handling, and is well-suited for large sample batches analyzed using an autosampler.
New approaches for stable isotope ratio measurements iaea tecdoc 1247
1) New analytical techniques for stable isotope ratio measurements have emerged over the past decade, including non-mass spectrometric techniques using laser spectroscopy and mass-spectrometric techniques with on-line or continuous flow sample introduction.
2) Two promising non-mass spectrometric techniques are infrared laser absorption spectrometry for simultaneous measurement of hydrogen, oxygen, and oxygen isotopes in water, and laser assisted isotope ratio analysis for carbon isotopes in CO2.
3) While mass spectrometry remains dominant, on-line and continuous flow techniques have improved precision and enabled new applications by coupling devices like gas chromatography to isotope ratio mass spectrometry. However, standardization of techniques and reference materials remains an ongoing challenge.
Sample weight calculator
This document provides instructions for using an online sample weight calculator to determine the optimal sample weights for isotope analysis. Users enter the percentage of nitrogen and carbon in their material, and the calculator returns results for the smallest and optimal sample weights within limits of 75mg total weight and 12mg of carbon. Sample weights should be optimized to target 20 micrograms of nitrogen while not exceeding 100 micrograms.
Isotope ratio mass spectrometer description
The document discusses isotope ratio mass spectrometry (IRMS) and its application in stable isotope analysis. IRMS allows for precise measurements of stable isotope ratios in samples to determine their composition and origin. It involves reducing complex compounds in a sample to simple molecules like CO2 or N2, then using a mass spectrometer to separate the different isotopes based on their mass and measure their ratios. This provides information about isotopes like hydrogen, oxygen, carbon, nitrogen and sulfur in the sample. The document also describes the principles and procedures for analyzing specific isotopes like carbon-13, nitrogen-15, hydrogen-2 and oxygen-18 using a continuous flow isotope ratio mass spectrometer.
Irms (introduction)
The document discusses isotope ratio mass spectrometry (IRMS) techniques in Malaysia. It provides:
1) A history of IRMS use in Malaysia, including the purchase of the first IRMS in 1989 and a newer model in 2007 with expanded isotope measurement capabilities.
2) Details on the current SERCON GEO20-20 IRMS, including its sample introduction modes, elemental analyzer and water equilibration system for preparing samples prior to analysis.
3) An overview of the theory behind stable isotope measurements, including atomic structure, isotope definitions, and fractionation processes. The document outlines common environmental isotopes measured by IRMS and their applications.
L18 accident case studies 8 october, 2015
This document discusses radiological accidents involving radioactive sources and x-ray devices. It provides an overview of major accidents that have occurred worldwide. The objectives are to inform radiation protection officers and others handling radioactive materials about past accidents and their causes. Several case studies are examined, including an accident in Bangladesh involving overexposure from an Ir-192 source during industrial radiography. Common causes of accidents identified include failures in safety systems, security, and human errors stemming from lack of safety culture and information sharing. The highest risk sources in accidents are discussed as well as groupings of accidents by practice, hazard effects, and consequences. Lessons learned focus on improving regulatory control, training, emergency response, and information dissemination.
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The document discusses quality assurance programs for industrial practices. It defines quality assurance and explains that QA programs measure process quality to help produce quality products, but cannot guarantee results. An effective QA program includes organizational structure, responsibilities, management measures, and an interdisciplinary approach. It also outlines basic requirements for QA programs such as quality policy, planning, training, document control, work processes, design, procurement, inspections, management self-assessment and independent assessment.
L16 radiation shielding
1. The document discusses principles of radiation shielding, including the use of time, distance, and shielding materials to reduce radiation exposure. It provides examples showing how to calculate exposure levels based on these principles.
2. Shielding materials like lead, steel, concrete, and tungsten are discussed. Metrics like half-value layer and tenth-value layer are introduced to characterize the shielding ability of different materials against different radiation types.
3. The concept of buildup factor is explained, which accounts for increased radiation levels due to scattering in shielding materials. Proper ordering of shielding layers can help minimize radiation buildup.
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2016 new organic reference materials for h, c, n measurements supporting in...
This document describes 19 new organic reference materials developed for hydrogen, carbon, and nitrogen stable isotope ratio measurements, in addition to analyzing 3 pre-existing reference materials. The new reference materials span a wide range of isotope values and include materials like caffeines, n-alkanes, fatty acid methyl esters, glycines, L-valines, polyethylenes, and oils. Eleven laboratories from 7 countries performed isotope ratio measurements of the materials using multiple analytical techniques. Bayesian statistical analysis was used to determine the mean isotope values for each material. The new reference materials will enable normalization of sample measurements to international isotope scales.
Absolute isotopic scale for deuterium analysis of natural waters
This document defines an absolute isotopic scale for deuterium analysis of natural waters based on measurements of two reference standards - Standard Mean Ocean Water (SMOW) and Standard Light Antarctic Precipitation (SLAP). The absolute D/H ratios were measured through mass spectrometric comparison with calibration mixtures prepared in the laboratory. The results obtained are:
1) The absolute D/H ratio of SMOW is 155.76 ± 0.05 x 10-6.
2) The absolute D/H ratio of SLAP is 89.02 ± 0.05 x 10-6.
3) The δD value of SLAP relative to SMOW is -428.50 ±
Acid fumigation preparing c-13 solid samples for organic analysis
1) The document provides tips for preparing difficult soil, sediment, filter, wood, and carbonate samples for 13C and 15N analysis, including removing inorganic carbonates from calcareous samples.
2) It recommends weighing samples into silver capsules, placing them in an acid desiccator to release carbon dioxide from carbonates over 6-8 hours, then drying and re-encapsulating samples in tin capsules for combustion.
3) The additional tin capsule acts as an important combustion catalyst and prevents leaks that could lose sample material during crimping.
Acid fumigation of soils to remove co3 prior to c 13 isotopic analysis
This document describes a method for removing carbonates from soil samples prior to isotopic analysis of total organic carbon or carbon-13. It compares the effectiveness of acid fumigation using hydrochloric acid vapor versus acid washing. The key findings are:
1) Hydrochloric acid fumigation is highly effective at removing carbonates from soils, does not remove water-soluble organic carbon, and does not alter the carbon-13 signature of the residual soil organic matter.
2) Acid washing soils with hydrochloric acid, while removing carbonates, results in significant losses of total soil carbon and nitrogen as well as changes to the carbon-13 signature.
3) Hydrochloric acid f
Carbonate removal by acid fumigation for measuring 13 c
This study evaluated a method of removing carbonates from soil samples using acid fumigation to allow for accurate measurement of soil organic carbon concentrations and isotopic signatures. Soil samples from two depths were exposed to hydrochloric acid vapors for varying time periods. Analysis found that a minimum of 30 hours of exposure was needed to remove all carbonates from surface soil samples containing 0.80% inorganic carbon, while 56 hours was required for subsurface samples containing 1.94% inorganic carbon. The rate of inorganic carbon removal was similar to previous studies. A correction factor was also used to account for mass changes during fumigation to allow accurate determination of soil organic carbon concentrations.
Carbonate removal from coastal sediments for the determination of organic c a...
The document compares two methods for removing inorganic carbon from samples to isolate organic carbon for analysis: the aqueous method using hydrochloric acid (HClaq) and the vaporous method using hydrochloric acid vapor (HClvap). It evaluates the methods based on their ability to have low blank levels, efficiently remove dolomite, yield accurate measurements of organic carbon percentage and isotopic signatures (δ13C and Δ14C). The vaporous method met all criteria if samples were not overexposed to acid. The aqueous method gave similar results but was less reliable and consistently underestimated organic carbon percentage. Optimal acid exposure times need to be determined for each sample type to obtain the most accurate isotopic measurements.
Forensic application of irms
This document provides an overview of stable isotope ratio mass spectrometry (IRMS) and its forensic applications. IRMS is a technique that can help distinguish between sources of the same substance. It does this by measuring the natural variations in isotope ratios present due to fractionation effects during chemical and physical processes. The document reviews how IRMS has been used to individualize samples in cases involving explosives, ignitable liquids, and illicit drugs. It also discusses the delta notation and standards used to report isotope ratio data and the kinetic and thermodynamic fractionation effects that create characteristic isotope ratio signatures.
Improved method for analysis of dic in natural water samples
This improved method allows for the isotopic and quantitative analysis of dissolved inorganic carbon (DIC) in natural water samples. It involves injecting an aliquot of water into a glass tube containing phosphoric acid, which converts the DIC into gaseous and aqueous carbon dioxide. After 15-24 hours of equilibration, a portion of the headspace gas, mainly carbon dioxide, is introduced into a gas chromatograph coupled to an isotope ratio mass spectrometer to measure the carbon isotope ratio and determine the δ13C value of DIC. Standard solutions are used to calibrate the method and account for carbon isotope fractionation between gaseous and aqueous carbon dioxide phases. The method can analyze around 50 samples per day and
Introduction to isotopic calculation
This document provides an introduction to isotopic calculations, including:
- Methods for expressing isotopic abundances using terms like atom percent and fractional abundance.
- Isotopic mass balance calculations for combinations of materials and isotope dilution analyses.
- The delta notation used to express differences in isotopic composition between samples.
- How fractionations between isotopes can provide information about isotope effects and processes samples have undergone.
- How the reversibility of reactions and whether systems are open or closed impact isotopic distributions between reactants and products at equilibrium.
Isotope ratio mass spectrometry minireview
Isotope ratio mass spectrometry (IRMS) is a technique that determines the relative abundances of isotopes in a sample to find its geographic, chemical, and biological origins. Variations in isotope ratios of elements like carbon, hydrogen, oxygen, sulfur, and nitrogen occur through kinetic and thermodynamic processes and can differentiate between chemically identical samples. IRMS instruments precisely measure subtle differences in natural isotope abundances to provide information in many fields. Sample introduction is usually through elemental analyzers, gas chromatography, or liquid chromatography interfaced with an IRMS instrument.
Measurement of slap2 and gisp 17 o and proposed vsmow slap normalization
The document presents new measurements of the δ17O values of SLAP2 and GISP ice core water samples. It aims to establish a standardized δ17O value for SLAP to improve normalization and reduce discrepancies in reported δ17O and 17Oexcess values between laboratories. The authors measured the samples on a mass spectrometer and recommend defining SLAP to have δ18O = -55.5‰ and 17Oexcess = 0, yielding an approximate δ17O value of -29.6968‰. Using this normalization, their measured values of GISP were δ17O = -13.16 ± 0.05‰ and 17Oexcess = 22 ± 11 per meg. They conclude
Method of sampling and analysis of 13 c dic in groundwaters
This document describes a new method for analyzing the stable carbon isotopic composition (δ13C) of dissolved inorganic carbon (DIC) in groundwater samples. The method uses a gas evolution technique where water samples are injected into vials containing phosphoric acid, which causes the DIC to evolve as CO2 gas. The vials are then analyzed using an automated continuous-flow gas preparation system coupled to an isotope ratio mass spectrometer. This allows for fast (10 minute) analysis of DIC δ13C with high precision (0.1‰) and accuracy. The method is robust, requires minimal field handling, and is well-suited for large sample batches analyzed using an autosampler.
New approaches for stable isotope ratio measurements iaea tecdoc 1247
1) New analytical techniques for stable isotope ratio measurements have emerged over the past decade, including non-mass spectrometric techniques using laser spectroscopy and mass-spectrometric techniques with on-line or continuous flow sample introduction.
2) Two promising non-mass spectrometric techniques are infrared laser absorption spectrometry for simultaneous measurement of hydrogen, oxygen, and oxygen isotopes in water, and laser assisted isotope ratio analysis for carbon isotopes in CO2.
3) While mass spectrometry remains dominant, on-line and continuous flow techniques have improved precision and enabled new applications by coupling devices like gas chromatography to isotope ratio mass spectrometry. However, standardization of techniques and reference materials remains an ongoing challenge.
Sample weight calculator
This document provides instructions for using an online sample weight calculator to determine the optimal sample weights for isotope analysis. Users enter the percentage of nitrogen and carbon in their material, and the calculator returns results for the smallest and optimal sample weights within limits of 75mg total weight and 12mg of carbon. Sample weights should be optimized to target 20 micrograms of nitrogen while not exceeding 100 micrograms.
Isotope ratio mass spectrometer description
The document discusses isotope ratio mass spectrometry (IRMS) and its application in stable isotope analysis. IRMS allows for precise measurements of stable isotope ratios in samples to determine their composition and origin. It involves reducing complex compounds in a sample to simple molecules like CO2 or N2, then using a mass spectrometer to separate the different isotopes based on their mass and measure their ratios. This provides information about isotopes like hydrogen, oxygen, carbon, nitrogen and sulfur in the sample. The document also describes the principles and procedures for analyzing specific isotopes like carbon-13, nitrogen-15, hydrogen-2 and oxygen-18 using a continuous flow isotope ratio mass spectrometer.
Irms (introduction)
The document discusses isotope ratio mass spectrometry (IRMS) techniques in Malaysia. It provides:
1) A history of IRMS use in Malaysia, including the purchase of the first IRMS in 1989 and a newer model in 2007 with expanded isotope measurement capabilities.
2) Details on the current SERCON GEO20-20 IRMS, including its sample introduction modes, elemental analyzer and water equilibration system for preparing samples prior to analysis.
3) An overview of the theory behind stable isotope measurements, including atomic structure, isotope definitions, and fractionation processes. The document outlines common environmental isotopes measured by IRMS and their applications.
L18 accident case studies 8 october, 2015
This document discusses radiological accidents involving radioactive sources and x-ray devices. It provides an overview of major accidents that have occurred worldwide. The objectives are to inform radiation protection officers and others handling radioactive materials about past accidents and their causes. Several case studies are examined, including an accident in Bangladesh involving overexposure from an Ir-192 source during industrial radiography. Common causes of accidents identified include failures in safety systems, security, and human errors stemming from lack of safety culture and information sharing. The highest risk sources in accidents are discussed as well as groupings of accidents by practice, hazard effects, and consequences. Lessons learned focus on improving regulatory control, training, emergency response, and information dissemination.
L17 qa in industrial practices
This document discusses quality assurance and quality control programs for industrial radiation practices. It provides definitions of QA and QC, including that QA is a set of processes to ensure desirable outcomes by reducing defects. It outlines the key elements of a comprehensive QA program, including a quality assurance committee, policies and procedures manual, and quality audits. The document also discusses international standards and guidelines for QA programs from organizations like the IAEA and ISO.
L17 qa for industrial practices
The document discusses quality assurance programs for industrial practices. It defines quality assurance and explains that QA programs measure process quality to help produce quality products, but cannot guarantee results. An effective QA program includes organizational structure, responsibilities, management measures, and an interdisciplinary approach. It also outlines basic requirements for QA programs such as quality policy, planning, training, document control, work processes, design, procurement, inspections, management self-assessment and independent assessment.
L16 radiation shielding
1. The document discusses principles of radiation shielding, including the use of time, distance, and shielding materials to reduce radiation exposure. It provides examples showing how to calculate exposure levels based on these principles.
2. Shielding materials like lead, steel, concrete, and tungsten are discussed. Metrics like half-value layer and tenth-value layer are introduced to characterize the shielding ability of different materials against different radiation types.
3. The concept of buildup factor is explained, which accounts for increased radiation levels due to scattering in shielding materials. Proper ordering of shielding layers can help minimize radiation buildup.
More from Mahbubul Hassan (20)
2016 new organic reference materials for h, c, n measurements supporting in...
2016 new organic reference materials for h, c, n measurements supporting in...
Absolute isotopic scale for deuterium analysis of natural waters
Absolute isotopic scale for deuterium analysis of natural waters
Acid fumigation preparing c-13 solid samples for organic analysis
Acid fumigation preparing c-13 solid samples for organic analysis
Acid fumigation of soils to remove co3 prior to c 13 isotopic analysis
Acid fumigation of soils to remove co3 prior to c 13 isotopic analysis
Carbonate removal by acid fumigation for measuring 13 c
Carbonate removal by acid fumigation for measuring 13 c
Carbonate removal from coastal sediments for the determination of organic c a...
Carbonate removal from coastal sediments for the determination of organic c a...
Improved method for analysis of dic in natural water samples
Improved method for analysis of dic in natural water samples
Measurement of slap2 and gisp 17 o and proposed vsmow slap normalization
Measurement of slap2 and gisp 17 o and proposed vsmow slap normalization
Method of sampling and analysis of 13 c dic in groundwaters
Method of sampling and analysis of 13 c dic in groundwaters
New approaches for stable isotope ratio measurements iaea tecdoc 1247
New approaches for stable isotope ratio measurements iaea tecdoc 1247
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IEA World Energy Investment June 2024- Statistics
IEA World Energy Investment Report 2024
Publication: June 2024
原版制作(英国Southampton毕业证书)南安普顿大学毕业证录取通知书一模一样
学校原件一模一样【微信：741003700 】《(英国Southampton毕业证书)南安普顿大学毕业证》【微信：741003700 】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
【主营项目】
一.毕业证【q微741003700】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【q/微741003700】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
Abiy Berehe - Texas Commission on Environmental Quality Updates
Abiy Berehe - Texas Commission on Environmental Quality UpdatesTexas Alliance of Groundwater Districts
Presented at June 6-7 Texas Alliance of Groundwater Districts Business MeetingBorder towns and spaces of (in)visibility.pdf
This report explores the significance of border towns and spaces for strengthening responses to young people on the move. In particular it explores the linkages of young people to local service centres with the aim of further developing service, protection, and support strategies for migrant children in border areas across the region. The report is based on a small-scale fieldwork study in the border towns of Chipata and Katete in Zambia conducted in July 2023. Border towns and spaces provide a rich source of information about issues related to the informal or irregular movement of young people across borders, including smuggling and trafficking. They can help build a picture of the nature and scope of the type of movement young migrants undertake and also the forms of protection available to them. Border towns and spaces also provide a lens through which we can better understand the vulnerabilities of young people on the move and, critically, the strategies they use to navigate challenges and access support.
The findings in this report highlight some of the key factors shaping the experiences and vulnerabilities of young people on the move – particularly their proximity to border spaces and how this affects the risks that they face. The report describes strategies that young people on the move employ to remain below the radar of visibility to state and non-state actors due to fear of arrest, detention, and deportation while also trying to keep themselves safe and access support in border towns. These strategies of (in)visibility provide a way to protect themselves yet at the same time also heighten some of the risks young people face as their vulnerabilities are not always recognised by those who could offer support.
In this report we show that the realities and challenges of life and migration in this region and in Zambia need to be better understood for support to be strengthened and tuned to meet the specific needs of young people on the move. This includes understanding the role of state and non-state stakeholders, the impact of laws and policies and, critically, the experiences of the young people themselves. We provide recommendations for immediate action, recommendations for programming to support young people on the move in the two towns that would reduce risk for young people in this area, and recommendations for longer term policy advocacy.
Practical guide for the celebration of World Environment Day on june 5th.
Land degradation, desertification and drought resilience. UN ENVIRONMENT PROGRAMME -WORLD ENVIRONMENT DAY 2024.
United Nations World Oceans Day 2024; June 8th " Awaken new dephts".
The program will expand our perspectives and appreciation for our blue planet, build new foundations for our relationship to the ocean, and ignite a wave of action toward necessary change.
RFP for Reno's Community Assistance Center
Property appraisals completed in May for downtown Reno’s Community Assistance and Triage Centers (CAC) reveal that repairing the buildings to bring them back into service would cost an estimated $10.1 million—nearly four times the amount previously reported by city staff.
原版制作(Hope毕业证书)利物浦霍普大学毕业证文凭证书一模一样
学校原件一模一样【微信：741003700 】《(Hope毕业证书)利物浦霍普大学毕业证文凭证书》【微信：741003700 】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
【主营项目】
一.毕业证【q微741003700】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【q/微741003700】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
在线办理美国乔治华盛顿大学毕业证（gwu毕业证书）学历学位证书原版一模一样
原版一模一样【微信：741003700 】【美国乔治华盛顿大学毕业证（gwu毕业证书）学历学位证书】【微信：741003700 】学位证，留信认证（真实可查，永久存档）offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原海外各大学 Bachelor Diploma degree, Master Degree Diploma
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
快速办理(UVM毕业证书)佛蒙特大学毕业证学位证一模一样
学校原件一模一样【微信：741003700 】《(UVM毕业证书)佛蒙特大学毕业证学位证》【微信：741003700 】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
【主营项目】
一.毕业证【q微741003700】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【q/微741003700】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
在线办理(ISU毕业证书)爱荷华州立大学毕业证学历证书一模一样
学校原件一模一样【微信：741003700 】《(ISU毕业证书)爱荷华州立大学毕业证学历证书》【微信：741003700 】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
【主营项目】
一.毕业证【q微741003700】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【q/微741003700】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
PAS PSDF Mop Up Workshop Presentation 2024 .pptx
This is the slide deck of what PAS learnt supporting councils awarded Planning Skills Delivery Funds
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Researching the client.pptxsxssssssssssssssssssssss
Researching the client.pptxsxssssssssssssssssssssss
Abiy Berehe - Texas Commission on Environmental Quality Updates
Abiy Berehe - Texas Commission on Environmental Quality Updates
Practical guide for the celebration of World Environment Day on june 5th.
Practical guide for the celebration of World Environment Day on june 5th.
United Nations World Oceans Day 2024; June 8th " Awaken new dephts".
United Nations World Oceans Day 2024; June 8th " Awaken new dephts".
Qgis training nata
- 1. Preparation and Presentation of Geospatial Data in Maps Mr AFM Tariqul Islam Scientific Officer ASICT Division, BARI, Gazipur-1701 Email: tareq@bari.gov.bd QGIS Downlod Installation and Use
- 8. Always open with QGIS Desktop icon QGIS Operation
- 9. How to open shape file in QGIS 1 4 2 3 5
- 10. 6
- 11. 7
- 12. How to change background colour of a shape file 1. Right click 2. Select Properties
- 13. 3 4 5 6
- 15. How to show level (District Name) to a shape file
- 17. District map showing Name
- 18. How make different colour for each district
- 20. 1-Select Graduated 2- no. of class 3- Select Colour 4-Classify 5 How to classify Boro Production
- 21. Boro Production classified map
- 22. How to Export Map from software
- 26. 1-use for Tittle 2- click then drag on map 3-click then drag on map 4-click and drag
- 27. For changing Title first click on Then write your desired title
- 28. 1 2
- 30. 1- Right click 2 How to add New data in shape file
- 31. 1 2 3 4 5
- 32. 1 2- click on district 3- input production data 4