This document provides an overview of atomic absorption spectroscopy. It describes the basic principles, instrumentation, and applications of AAS. The key components of an AAS include a light source, atomizer, monochromator, and detector. Samples are atomized in a flame or graphite furnace and analyzed by measuring the absorption of light from a hollow cathode lamp at specific wavelengths corresponding to the element of interest. Calibration curves are used to determine unknown concentrations in samples. AAS is commonly used to analyze metals in environmental, food, and pharmaceutical applications.
Its all about absorption & emission of radiation by specific element present in the sample.
We can calculate Absorption in terms of Transmittence by Beer's Lambert law.
A= 2-log(%T) or A= log(transmittance)
Its all about absorption & emission of radiation by specific element present in the sample.
We can calculate Absorption in terms of Transmittence by Beer's Lambert law.
A= 2-log(%T) or A= log(transmittance)
Fourier Transform Infrared Spectroscopy-:A type of infrared spectroscopy.It is method of obtaining an infrared spectrum by measuring interferogram and then performimg a Fourier Transform upon the interferogram to obtain the spectrum.
Fourier transform infrared spectroscopy: advantage and disadvantage of conventional infrared spectroscopy, introduction to FTIR ,principle of FTIR, working, advantage, disadvantage and application of FTIR.
Atomic Absorption spectrometer is an instrument used for quantitative analysis of most of the metals in nano grams. This is highly sensitive technique used for analysis.
A technique to determine concentration of elements in the solution by aspirating this sample into flame. Evaporation, Atomization, Excitation ,Emission and Ionization occur in the flame.
A short lecture about Atomic Spectroscopy: Flame Photometry, Atomic Absorption, and Atomic Emission with Coupled Plasma (FP, AA and ICP-AES). Presented at 28.03.2011, Faculty of Agriculture, Hebrew University of Jerusalem, by Vasiliy Rosen, M.Sc.
Fourier Transform Infrared Spectroscopy-:A type of infrared spectroscopy.It is method of obtaining an infrared spectrum by measuring interferogram and then performimg a Fourier Transform upon the interferogram to obtain the spectrum.
Fourier transform infrared spectroscopy: advantage and disadvantage of conventional infrared spectroscopy, introduction to FTIR ,principle of FTIR, working, advantage, disadvantage and application of FTIR.
Atomic Absorption spectrometer is an instrument used for quantitative analysis of most of the metals in nano grams. This is highly sensitive technique used for analysis.
A technique to determine concentration of elements in the solution by aspirating this sample into flame. Evaporation, Atomization, Excitation ,Emission and Ionization occur in the flame.
A short lecture about Atomic Spectroscopy: Flame Photometry, Atomic Absorption, and Atomic Emission with Coupled Plasma (FP, AA and ICP-AES). Presented at 28.03.2011, Faculty of Agriculture, Hebrew University of Jerusalem, by Vasiliy Rosen, M.Sc.
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www.oecd.org/regional/regional-policy/
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Atomic Absorption Spectroscopy is a very common technique for detecting metals and metalloids in samples.
It is very reliable and simple to use.
It can analyze over 62 elements.
It also measures the concentration of metals in the sample.
It relate with the spectrophotometry. The components and the uses of each of them are detailed. The ultimate goal of using this spectrometry and the uses of them also explained well.
ATOMIC ABSORPTION SPECTROSCOPY by Faizan AkramFaizan Akram
Atomic absorption spectroscopy is a technique for determining the concentration of a particular metal element in a sample. Atomic absorption spectroscopy can be used to analyze the concentration of over 62 different metals in a solution.
a brief discussion of AAS, an analytical technique use for heavy metal analysis. Atomic absorption spectroscopy is a quantitative method of analysis of any kind of sample; that is applicable to many metals
AAS can be used to determine over 70 different elements in solution, or directly in solid samples via electro thermal vaporization.
Atomic Absorption Spectroscopy is a very common technique for detecting metals and metalloids in samples.
It is very reliable and simple to use.
It also measures the concentration of metals in the sample.
Atomic Absorption Spectroscopy is an analytical technique that measures the concentration of an element by measuring the amount of light that is absorbed at a characteristic wavelength when it passes through cloud of atoms
As the number of atoms in the light path increases, the amount of light absorbed increases.
Applications: Presence of metals as an impurity or in alloys can be perform.
Level of metals could be detected in tissue samples like Aluminum in blood and Copper in brain tissues.
Due to wear and tear there are different sorts of metals which are given in the lubrication oils which could be determined for the analysis of conditions of machines.
Determination of elements in the agricultural samples.
Water sample analysis (e.g. Ca, Mg, Fe, Si, Al, Ba content).
Food sample analysis.
Analysis of animal feedstuffs (e.g. Mn, Fe, Cu, Cr, Se, Zn).
Analysis of additives in lubricating oils and greases (Ba, Ca, Na, Li, Zn, Mg). analysis of soils.
Clinical sample analysis (blood samples: whole blood, plasma, serum; Ca, Mg, Li, Na, K, Fe).
Analysis of Environmental samples such as- drinking water, ocean water, soil.
Pharmaceutical sample Analysis: Estimation of zinc in insulin preparation, calcium in calcium salt is done by using AAS. Principle: The sample, in solution, is aspirated as a spray into a chamber, where it is mixed with air and fuel.
This mixture passes through baffles, here large drops fall and are drained off. Only fine droplets reach the flame.
Light from the hollow-cathode lamp passes through the sample of ground-state atoms in the flame.
The amount of light absorbed is proportional to the concentration.
The element being determined must be reduced to the elemental state, vaporized, and imposed in the beam of the radiation in the source.
When a ground-state atom absorbs light energy, an excited atom is produced.
The excited atom then returns to the ground state, emitting light of the same energy as it absorbed.
The flame sample thus contains a dynamic population of ground-state and excited atoms, both absorbing and emitting radiant energy. The emitted energy from the flame will go in all directions, and it will be a steady emission.
Because the purpose of the instrument is to measure the amount of light absorbed, the light detector must be able to distinguish between the light beam emitted by the hollow cathode lamp and that emitted by excited atoms in the flame.
Pharmaceuticals: In some pharmaceutical manufacturing processes, minute quantities of a catalyst used in the process (usually a metal) are sometimes present in the final product. By using AAS the amount of catalyst present can be determined.
Atomic absorption spectroscopy (AAS) and atomic emission spectroscopy (AES) is a spectro analytical procedure for the quantitative determination of chemical elements by free atoms in the gaseous state.
Atomic absorption spectroscopy is based on absorption of light by free metallic ions.
In analytical chemistry the technique is used for determining the concentration of a particular element (the analyte) in a sample to be analyzed. AAS can be used to determine over 70 different elements in solution, or directly in solid samples via electrothermal vaporization
Atomic absorption spectrometry (AAS) is an analytical technique that measures the concentrations of elements.
Atomic absorption is so sensitive that it can measure down to parts per billion of a gram (µg dm–3 ) in a sample.
The technique makes use of the wavelengths of light specifically absorbed by an element. They correspond to the energies needed to promote electrons from one energy level to another, higher, energy level.
Atomic absorption spectrometry has many uses in different areas of chemistry.
Clinical analysis : Analysing metals in biological fluids such as blood and urine.
Environmental analysis: Monitoring our environment – eg finding out the levels of various elements in rivers, seawater, drinking water, air, petrol and drinks such as wine, beer and fruit drinks.
The technique makes use of the atomic absorption spectrum of a sample in order to assess the concentration of specific analytes within it. It requires standards with known analyte content to establish the relation between the measured absorbance and the analyte concentration and relies therefore on the [Beer–Lambert law].
The electrons within an atom exist at various energy levels. When the atom is exposed to its own unique wavelength, it can absorb the energy (photons) and electrons move from a ground state to excited states.
The radiant energy absorbed by the electrons is directly related to the transition that occurs during this process.
Furthermore, since the electronic structure of every element is unique, the radiation absorbed represents a unique property of each individual element and it can be measured.
An atomic absorption spectrometer uses these basic principles and applies them in practical quantitative analysis
A typical atomic absorption spectrometer consists of four main components:
Atomization
Light source,
Atomization system,
Monochromator &
Detection system
Atomization can be carried out either by a flame or furnace.
Heat energy is utilized in atomic absorption spectroscopy to convert metallic elements to atomic dissociated vapor.
The temperature should be controlled very carefully for the conversion of atomic vapor.
At too high temperatures, atoms
Instrumental Method of AnalysisUnit 2 (3) Atomic absorption spectroscopy/AAS/
Atomic flame Photometry
(Part -1)
Introduction- Briefing
Atomic spectroscopy involved three major techniques- Atomic emission spectroscopy,
Atomic absorption spectroscopy, and Atomic fluorescence spectroscopy
Principle, Theory of atomic Absorption spectroscopy
Interferences
Instrumentation-
Type AAS
1. Single beam atomic absorption spectrophotometer
2. Double beam atomic absorption spectrophotometer
the light source/radiation source- that emits the spectrum of the element of inetrest
the atomization system/ absorption cell- in which atoms the sample are produced (flame, graphites furnance etc
the monochromator- for light dispersion
the detection system- which measures the light intensity and amplified the signal
A read out device- that show the reading after it has been processed
Working AAS instrument (B. chopper, C. Flame atomizer - There is two types of burners in common used
1. Total consumption burner
2. Premixed burner
D. Fuel/ oxidant
E. Monochromator- Prism, gratting
F. Detectors-Photomultiplier tube
G. Recorder
Difference between Atomic Absorption Spectroscopy and Atomic Emission Spectroscopy
Advantange and limitation
Applications
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2. CONTENTS:CONTENTS:
Principle of AAS.Principle of AAS.
Instrumentation.Instrumentation.
Applications.Applications.
Test perform in AKU.Test perform in AKU.
3. INTRODUCTION:INTRODUCTION:
Atomic Absorption Spectroscopy is a very commonAtomic Absorption Spectroscopy is a very common
technique for detecting metals and metalloids intechnique for detecting metals and metalloids in
samples.samples.
It is very reliable and simple to use.It is very reliable and simple to use.
It can analyze over 62 elements.It can analyze over 62 elements.
It also measures the concentration of metals in theIt also measures the concentration of metals in the
sample.sample.
4. HISTORY:HISTORY:
The first atomic absorption spectrometer was built byThe first atomic absorption spectrometer was built by
CSIRO scientist Alan Walsh in 1954. Shown in theCSIRO scientist Alan Walsh in 1954. Shown in the
picture Alan Walsh(left), with a spectrometer.picture Alan Walsh(left), with a spectrometer.
5. Elements detectable by atomic absorption are highlighted in pink in thisElements detectable by atomic absorption are highlighted in pink in this
periodic tableperiodic table
6. PRINCIPLE:PRINCIPLE:
The technique uses basically the principle that freeThe technique uses basically the principle that free
atoms (gas) generated in an atomizer can absorbatoms (gas) generated in an atomizer can absorb
radiation at specific frequency.radiation at specific frequency.
Atomic-absorption spectroscopy quantifies theAtomic-absorption spectroscopy quantifies the
absorption of ground state atoms in the gaseous state .absorption of ground state atoms in the gaseous state .
The atoms absorb ultraviolet or visible light and makeThe atoms absorb ultraviolet or visible light and make
transitions to higher electronic energy levels. The analytetransitions to higher electronic energy levels. The analyte
concentration is determined from the amount ofconcentration is determined from the amount of
absorption.absorption.
7. - Concentration measurements are usually determined from aConcentration measurements are usually determined from a
working curve after calibrating the instrument with standardsworking curve after calibrating the instrument with standards
of known concentration.of known concentration.
- Atomic absorption is a very common technique forAtomic absorption is a very common technique for
detecting metals and metalloids in environmental samplesdetecting metals and metalloids in environmental samples..
11. LIGHT SOURCE:LIGHT SOURCE:
Hollow Cathode Lamp are the most common radiationHollow Cathode Lamp are the most common radiation
source in AAS.source in AAS.
It contains a tungsten anode and a hollow cylindricalIt contains a tungsten anode and a hollow cylindrical
cathode made of the element to be determined.cathode made of the element to be determined.
These are sealed in a glass tube filled with an inert gasThese are sealed in a glass tube filled with an inert gas
(neon or argon ) .(neon or argon ) .
Each element has its own unique lamp which must beEach element has its own unique lamp which must be
used for that analysis .used for that analysis .
12. NEBULIZER:NEBULIZER:
suck up liquid samples at controlled rate.suck up liquid samples at controlled rate.
create a fine aerosol spray for introduction into flame.create a fine aerosol spray for introduction into flame.
Mix the aerosol and fuel and oxidant thoroughlyMix the aerosol and fuel and oxidant thoroughly
for introduction into flame.for introduction into flame.
13. AtomizerAtomizer
ElementsElements to be analyzed needs to be in atomic sate.to be analyzed needs to be in atomic sate.
AtomizationAtomization isis separation of particles into individualseparation of particles into individual
molecules and breaking molecules into atoms. This ismolecules and breaking molecules into atoms. This is
done by exposing the analyte to high temperatures in adone by exposing the analyte to high temperatures in a
flame or graphite furnace .flame or graphite furnace .
15. FLAME ATOMIZERFLAME ATOMIZER::
To create flame, we need to mix an oxidant gas and aTo create flame, we need to mix an oxidant gas and a
fuel gas.fuel gas.
in most of the cases air-acetylene flame or nitrous oxide-in most of the cases air-acetylene flame or nitrous oxide-
acetylene flame is used.acetylene flame is used.
liquid or dissolved samples are typically used with flameliquid or dissolved samples are typically used with flame
atomizer.atomizer.
16.
17. GRAPHITE TUBE ATOMIZERGRAPHITE TUBE ATOMIZER::
uses a graphite coated furnace to vaporize the sample.uses a graphite coated furnace to vaporize the sample.
ln GFAAS sample, samples are deposited in a smallln GFAAS sample, samples are deposited in a small
graphite coated tube which can then be heated tographite coated tube which can then be heated to
vaporize and atomize the analyte.vaporize and atomize the analyte.
The graphite tubes are heated using a high currentThe graphite tubes are heated using a high current
power supply.power supply.
18. MONOCHROMATOR:MONOCHROMATOR:
This is a very important part in an AA spectrometer. It isThis is a very important part in an AA spectrometer. It is
used to separate out all of the thousands of lines.used to separate out all of the thousands of lines.
A monochromator is used to select the specificA monochromator is used to select the specific
wavelength of light which is absorbed by the sample,wavelength of light which is absorbed by the sample,
and to exclude other wavelengths.and to exclude other wavelengths.
The selection of the specific light allows theThe selection of the specific light allows the
determination of the selected element in the presence ofdetermination of the selected element in the presence of
others.others.
19. DETECTOR:DETECTOR:
The light selected by the monochromator is directed ontoThe light selected by the monochromator is directed onto
a detector that is typically a photomultiplier tube , whosea detector that is typically a photomultiplier tube , whose
function is to convert the light signal into an electricalfunction is to convert the light signal into an electrical
signal proportional to the light intensity.signal proportional to the light intensity.
The processing of electrical signal is fulfilled by a signalThe processing of electrical signal is fulfilled by a signal
amplifier . The signal could be displayed for readout , oramplifier . The signal could be displayed for readout , or
further fed into a data station for printout by thefurther fed into a data station for printout by the
requested formatrequested format..
20. Calibration CurveCalibration Curve
A calibration curve is used to determine the unknownA calibration curve is used to determine the unknown
concentration of an element in a solution. The instrumentconcentration of an element in a solution. The instrument
is calibrated using several solutions of knownis calibrated using several solutions of known
concentrations. The absorbance of each known solutionconcentrations. The absorbance of each known solution
is measured and then a calibration curve ofis measured and then a calibration curve of
concentration vs absorbance is plotted.concentration vs absorbance is plotted.
The sample solution is fed into the instrument, and theThe sample solution is fed into the instrument, and the
absorbance of the element in this solution isabsorbance of the element in this solution is
measured .The unknown concentration of the element ismeasured .The unknown concentration of the element is
then calculated from the calibration curvethen calculated from the calibration curve
21. APPLICATIONS:APPLICATIONS:
Determination of even small amounts of metals (lead,Determination of even small amounts of metals (lead,
mercury, calcium, magnesium, etc) as follows:mercury, calcium, magnesium, etc) as follows:
Environmental studies: drinking water, ocean water, soil.Environmental studies: drinking water, ocean water, soil.
Food industry.Food industry.
Pharmaceutical industry.Pharmaceutical industry.
22. TEST IN AKUTEST IN AKU
LEAD COCENTRATION.LEAD COCENTRATION.
ZINC COCENTRATION.ZINC COCENTRATION.
COPPER COCENTRATION.COPPER COCENTRATION.
23. REFERENCES:REFERENCES:
Vogel’s Textbook of Quantitative AnalysisVogel’s Textbook of Quantitative Analysis, G. Svehla,, G. Svehla,
Pearson.Pearson.
Principles of Instrumental AnalysisPrinciples of Instrumental Analysis, Skoog., Skoog.
Basic Concepts Of Analytical chemistryBasic Concepts Of Analytical chemistry, S M Khopkar., S M Khopkar.