The document provides information about measuring electrical conductivity:
- Electrical conductivity is a measure of a solution's ability to conduct electricity and depends on ion concentration, temperature, and ion type/charge.
- Conductivity is measured using a conductivity cell and meter, which applies a voltage to electrodes in contact with the solution.
- The cell constant relates the measured resistance to conductivity and must be regularly calibrated using standard solutions.
- Conductivity increases with temperature so measurements are corrected to 25°C.
- Different ions contribute differently to conductivity based on their charge and concentration. Conductivity can thus estimate total dissolved solids in a solution.
Definition of chrono potentiometry
Introduction about chrono potentiomerty
Experimental setup of chronopotentiometry
Theory of chronopotentiometry
Output wave function of chrono potentiometry
Analysis of an chronopotentiometry
Main window of chronopotentiometry
used files in chronopotentiometry
disadvantages of chronopotentiometry
Application of chrono potentiometry
compare of chronopotentiometry
Using hardware
Feature of files in chronopotentiometry
Branches of chemistry, careers in chemistry, in the chemistry laboratory, laboratory rules, why chemistry apparatus are made of glass, the bunsen burner, differences between a luminous and non-luminous flame, apparatus for measuring volume, temperature, mass, time, etc
Organic chemistry has two main divisions. One division deals with aliphatic (fatty) compounds, the first compounds you encountered in Organic Chemistry I. The second division includes the aromatic (fragrant) compounds, of which benzene is a typical example.
CONDUCTIVITY-TYPES-VARIATION WITH DILUTION-KOHLRAUSCH LAW - TRANSFERENCE NUMBER -DETERMINATION - IONIC MOBILITY - APPLICATION OF CONDUCTANCE MEASUREMENTS - CONDUCTOMENTRIC TITRATION
Definition of chrono potentiometry
Introduction about chrono potentiomerty
Experimental setup of chronopotentiometry
Theory of chronopotentiometry
Output wave function of chrono potentiometry
Analysis of an chronopotentiometry
Main window of chronopotentiometry
used files in chronopotentiometry
disadvantages of chronopotentiometry
Application of chrono potentiometry
compare of chronopotentiometry
Using hardware
Feature of files in chronopotentiometry
Branches of chemistry, careers in chemistry, in the chemistry laboratory, laboratory rules, why chemistry apparatus are made of glass, the bunsen burner, differences between a luminous and non-luminous flame, apparatus for measuring volume, temperature, mass, time, etc
Organic chemistry has two main divisions. One division deals with aliphatic (fatty) compounds, the first compounds you encountered in Organic Chemistry I. The second division includes the aromatic (fragrant) compounds, of which benzene is a typical example.
CONDUCTIVITY-TYPES-VARIATION WITH DILUTION-KOHLRAUSCH LAW - TRANSFERENCE NUMBER -DETERMINATION - IONIC MOBILITY - APPLICATION OF CONDUCTANCE MEASUREMENTS - CONDUCTOMENTRIC TITRATION
Experiment 4: Electropolymerized Conducting Polymers.
Introduction:
Conductive polymers (CP) exhibit very useful properties such as flexibility, solubility [1], electrical conductivity, low energy optical transitions, low ionization potential, and high electron affinity.[2] These characterizations make them such effective candidates for many applications such as antistatic and antimagnetic shielding devices[3], microwave attenuation[4], light emitting devices, optical sensors, enzymatic biosensors[5], electronic circuits, and detectors of odors and flavors. The most widely known conducting polymers are polypyrole, polyanaline, and polythiophene. By applying an electrical potential (reversible reaction), these polymers can be reduced. The role of these polymers when they are used as active templates in biosensor applications is the immobilization of dynamic species on the electrode. This will contribute to enhancing the sensitivity and the accuracy of analyte detection. CPs have been used for stabilizing numerous biological species such as enzymes, antibodies, haptens, DNA, and more interestingly the whole cells. [1]
Aim:
The aim of performing this experiment is to create a conducting polypyrrole film which consists of a stabilized enzyme, identify the film and its characteristics, and utilize it as glucose biosensor.
Procedure:
“Refer to Manual for NANO 3101/8302, Electropolymerized Conducting Polymers, Flinders University, p.24-29.”
Results and Discussion:
In the biosensor uses, the deposition of the polymers on the electrode surface can be done by applying an oxidative potential. During this action, the enzymes can be stabilized, and by modifying the deposition time, the amounts of the deposited layer can be recreated. The sensitivity, selectivity, and the accuracy of detection of the biosensors are reliant on the architecture of the polymer, the biological activity of the enzymatic immobilization, and the electropolymerisation circumstances.
In this experiment, the glucose oxidase (enzyme) was immobilized in a conducting polypyrole film on an electrode to find out their appropriateness as a functioning electrode. The performance of the electrode was measured through a Cyclic Voltammogram (CV) of ferricyanide
The geometric area of the electrode was measured by a ruler, and it was found to be 3.14 mm ²which is identical to 0.00314 cm².
The Randles-Sevcik equation is used in the redox reactions
at 25 C °
Where is the peak current, A is the electrode area (cm²), n is the number of electrons involved, C is the concentration of the bulk (mol/ml) for active species, v is the scan rate (V/s), and D is the diffusion coefficient.
n = 1, therefore
, therefore = 0.002756809.
V = 20mV/s = 0.02 V/s, therefore
C = 10 mM = 0.01 mol/L = 0.00001 mol/mL.
can be determined from figure.1
Figure 1: Cyclic Voltammograms (CV) as a function of escalating the scan rate for Platinum Electrode in ferrricyanide solution.
This c ...
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The continuous monitoring of liquid temperature in cryogenic application is essential requirement from control and safety point of view. . Several factors must be considered when selecting the type of sensor to be used in a specific application Any temperature dependent parameter can be used as a sensor if it fits the requirements of the given application. These parameters include resistance, forward voltage (diodes), thermal EMFs, capacitance, expansion/contraction of various materials, magnetic properties, noise properties, nuclear orientation properties, etc. The two most commonly used parameters in cryogenic are voltage (diodes) and resistance. There are several reasons for choosing diode thermometry or resistance thermometry. Therefore this paper present the demand of precision measurement of temperature is addressed using semiconductor diode type sensor and resistor type sensor by sensor characteristic.
Diabetes is a rapidly and serious health problem in Pakistan. This chronic condition is associated with serious long-term complications, including higher risk of heart disease and stroke. Aggressive treatment of hypertension and hyperlipideamia can result in a substantial reduction in cardiovascular events in patients with diabetes 1. Consequently pharmacist-led diabetes cardiovascular risk (DCVR) clinics have been established in both primary and secondary care sites in NHS Lothian during the past five years. An audit of the pharmaceutical care delivery at the clinics was conducted in order to evaluate practice and to standardize the pharmacists’ documentation of outcomes. Pharmaceutical care issues (PCI) and patient details were collected both prospectively and retrospectively from three DCVR clinics. The PCI`s were categorized according to a triangularised system consisting of multiple categories. These were ‘checks’, ‘changes’ (‘change in drug therapy process’ and ‘change in drug therapy’), ‘drug therapy problems’ and ‘quality assurance descriptors’ (‘timer perspective’ and ‘degree of change’). A verified medication assessment tool (MAT) for patients with chronic cardiovascular disease was applied to the patients from one of the clinics. The tool was used to quantify PCI`s and pharmacist actions that were centered on implementing or enforcing clinical guideline standards. A database was developed to be used as an assessment tool and to standardize the documentation of achievement of outcomes. Feedback on the audit of the pharmaceutical care delivery and the database was received from the DCVR clinic pharmacist at a focus group meeting.
Willie Nelson Net Worth: A Journey Through Music, Movies, and Business Venturesgreendigital
Willie Nelson is a name that resonates within the world of music and entertainment. Known for his unique voice, and masterful guitar skills. and an extraordinary career spanning several decades. Nelson has become a legend in the country music scene. But, his influence extends far beyond the realm of music. with ventures in acting, writing, activism, and business. This comprehensive article delves into Willie Nelson net worth. exploring the various facets of his career that have contributed to his large fortune.
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Introduction
Willie Nelson net worth is a testament to his enduring influence and success in many fields. Born on April 29, 1933, in Abbott, Texas. Nelson's journey from a humble beginning to becoming one of the most iconic figures in American music is nothing short of inspirational. His net worth, which estimated to be around $25 million as of 2024. reflects a career that is as diverse as it is prolific.
Early Life and Musical Beginnings
Humble Origins
Willie Hugh Nelson was born during the Great Depression. a time of significant economic hardship in the United States. Raised by his grandparents. Nelson found solace and inspiration in music from an early age. His grandmother taught him to play the guitar. setting the stage for what would become an illustrious career.
First Steps in Music
Nelson's initial foray into the music industry was fraught with challenges. He moved to Nashville, Tennessee, to pursue his dreams, but success did not come . Working as a songwriter, Nelson penned hits for other artists. which helped him gain a foothold in the competitive music scene. His songwriting skills contributed to his early earnings. laying the foundation for his net worth.
Rise to Stardom
Breakthrough Albums
The 1970s marked a turning point in Willie Nelson's career. His albums "Shotgun Willie" (1973), "Red Headed Stranger" (1975). and "Stardust" (1978) received critical acclaim and commercial success. These albums not only solidified his position in the country music genre. but also introduced his music to a broader audience. The success of these albums played a crucial role in boosting Willie Nelson net worth.
Iconic Songs
Willie Nelson net worth is also attributed to his extensive catalog of hit songs. Tracks like "Blue Eyes Crying in the Rain," "On the Road Again," and "Always on My Mind" have become timeless classics. These songs have not only earned Nelson large royalties but have also ensured his continued relevance in the music industry.
Acting and Film Career
Hollywood Ventures
In addition to his music career, Willie Nelson has also made a mark in Hollywood. His distinctive personality and on-screen presence have landed him roles in several films and television shows. Notable appearances include roles in "The Electric Horseman" (1979), "Honeysuckle Rose" (1980), and "Barbarosa" (1982). These acting gigs have added a significant amount to Willie Nelson net worth.
Television Appearances
Nelson's char
WRI’s brand new “Food Service Playbook for Promoting Sustainable Food Choices” gives food service operators the very latest strategies for creating dining environments that empower consumers to choose sustainable, plant-rich dishes. This research builds off our first guide for food service, now with industry experience and insights from nearly 350 academic trials.
Artificial Reefs by Kuddle Life Foundation - May 2024punit537210
Situated in Pondicherry, India, Kuddle Life Foundation is a charitable, non-profit and non-governmental organization (NGO) dedicated to improving the living standards of coastal communities and simultaneously placing a strong emphasis on the protection of marine ecosystems.
One of the key areas we work in is Artificial Reefs. This presentation captures our journey so far and our learnings. We hope you get as excited about marine conservation and artificial reefs as we are.
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Micro RNAs (miRNAs) are small non-coding RNAs molecules having approximately 18-25 nucleotides, they are present in both plants and animals genomes. MiRNAs have diverse spatial expression patterns and regulate various developmental metabolisms, stress responses and other physiological processes. The dynamic gene expression playing major roles in phenotypic differences in organisms are believed to be controlled by miRNAs. Mutations in regions of regulatory factors, such as miRNA genes or transcription factors (TF) necessitated by dynamic environmental factors or pathogen infections, have tremendous effects on structure and expression of genes. The resultant novel gene products presents potential explanations for constant evolving desirable traits that have long been bred using conventional means, biotechnology or genetic engineering. Rice grain quality, yield, disease tolerance, climate-resilience and palatability properties are not exceptional to miRN Asmutations effects. There are new insights courtesy of high-throughput sequencing and improved proteomic techniques that organisms’ complexity and adaptations are highly contributed by miRNAs containing regulatory networks. This article aims to expound on how rice miRNAs could be driving evolution of traits and highlight the latest miRNA research progress. Moreover, the review accentuates miRNAs grey areas to be addressed and gives recommendations for further studies.
UNDERSTANDING WHAT GREEN WASHING IS!.pdfJulietMogola
Many companies today use green washing to lure the public into thinking they are conserving the environment but in real sense they are doing more harm. There have been such several cases from very big companies here in Kenya and also globally. This ranges from various sectors from manufacturing and goes to consumer products. Educating people on greenwashing will enable people to make better choices based on their analysis and not on what they see on marketing sites.
Summary of the Climate and Energy Policy of Australia
Electrical conductivity
1. Chapter 9
Electrical conductivity
1 Introduction
As in the case of metallic conductors, electrical current can flow through a solution of an
electrolyte also. For metallic conductors: current is carried by electrons, chemical
properties of metal are not changed and an increase in temperature increases
resistance. The characteristics of current flow in electrolytes in these respects are
different. The current is carried by ions, chemical changes occur in the solution and an
increase in temperature decreases the resistance.
Electrical conductivity (EC) is a measure of the ability of water to conduct an electric
current and depends on:
Concentration of the ions (higher concentration, higher EC)
Temperature of the solution (high temperature, higher EC)
Specific nature of the ions (higher specific ability and higher valence, higher EC)
Conductivity changes with storage time and temperature. The measurement should
therefore be made in situ (dipping the electrode in the stream or well water) or in the
field directly after sampling. The determination of the electrical conductivity is a rapid
and convenient means of estimating the concentration of ions in solution. Since each
ion has its own specific ability to conduct current, EC is only an estimate of the total ion
concentration.
2 Equations and dimensions
Ohm's law defines the relation between potential (V) and current (I). The resistance (R)
is the ratio between V and I:
V
R= (1)
I
The resistance depends upon the dimensions of the conductor, length, L, in cm, cross-
sectional area, A, in cm2
and the specific resistance, p, in ohm.cm, of the conductor:
L
R=p x (2)
A
In the present case our interest is in specific conductance or electrical conductivity
(which is the preferred term), the reciprocal of specific resistance, k, in 1/ohm.cm or
Siemens per centimetre, S/cm, which can be thought of as the conductance offered by
1 cm3
of electrolyte:
1 L 1
k= = — x — (3)
p A R
The resistance of the electrolyte is measured across two plates dipped in the liquid and
held at a fixed distance apart in a conductivity cell. The ratio L/A for the cell is called cell
constant, Kc, and has the dimensions 1/cm. The value of the constant is determined by
measuring the resistance of a standard solution of known conductivity:
Kc= R.k ( 4 )
2. 3 Unit of measurement and reporting
In the international system of units (SI) the electrical conductivity is expressed in
Siemens which is the reciprocal of resistance in ohm. The older unit for conductance
was mho. Report conductivity as milli Siemens per meter at 25°C (mS.m"1
). See table
for conversions.
4 Apparatus
An apparatus called a conductivity meter that consists of a conductivity cell and a meter
measures conductivity. The conductivity cell
consists of two electrodes (platinum plates)
rigidly held at a constant distance from each
other and are connected by cables to the
meter. The meter consists of a Wheatstone
bridge circuit as shown in the figure. The
source of electric current in the meter applies
a potential to the plates and the meter
measures the electrical resistance of the
solution. In order to avoid change of apparent
resistance with time due to chemical
reactions (polarisation effect at the
electrodes) alternating current is used. Some
meters read resistance (ohm) while others
read in units of conductivity (milli-Siemens
Ri R2 per meter). Platinised electrodes must be in
good condition (clean, black-coated) and require replating if readings of the standard
solution become erratic. Replating should be done in the laboratory. The cell should
always be kept in distilled water when not in use, and thoroughly rinsed in distilled water
after measurement.
5 The cell constant (calibration)
The design of the plates in the conductivity cell (size, shape, position and condition)
determines the conductivity measured and is reflected in the so-called cell constant (Kc),
Typical values for Kc are 0.1 to 2.0. The cell constant can be determined by using the
conductivity meter to measure the resistance of a standard solution of 0.0100mol/L
potassium chloride (KCI). The conductivity of the solution (141.2 mS/m at 25°C)
multiplied by the measured resistance gives the value of Kc, Equation 4. The cell
constant is subject to slow changes in time, even under ideal conditions. Thus,
determination of the cell constant must be done regularly.
3. 6 Temperature correction
Conductivity is highly temperature dependent. Electrolyte conductivity increases with
temperature at a rate of 0.0191 mS/m°C for a standard KCI solution of 0.0100M.
For natural waters, this temperature coefficient is only approximately the same as that
of the standard KCI solution. Thus, the more the sample temperature deviates from
25°C the greater the uncertainty in applying the temperature correction. Always record
the temperature of a sample (+0.1 °C) and report the measured conductivity at 25°C
(using a temperature coefficient of 0.0191 mS/m°C)
Most of the modern conductivity meters have a facility to calculate the specific
conductivity at 25°C using a built in temperature compensation from 0 to 60°C. The
compensation can be manual (measure temperature separately and adjust meter to
this) or automatic (there is a temperature electrode connected to the meter).
7 Conductivity factor for different ions
Current is carried by both cations and anions, but to a different degree. The conductivity
due to divalent cations is more than that of mono-valent cations. However, it is not true
for anions. The conductivity factors for major ions present in water are listed below.
Table 2 Conductivity Factors for ions commonly found in water
Ion
Conductivity Factor
fjS/cm per mg/L
Cations
Ca 2+
2.60
Mg2+
3.82
K+
1.84
Na+
2.13
Anions
HCO3- 0.715
cr 2.14
S04'- 1.54
NO3- 1.15
The conductivity of a water sample can be approximated using the following relationship
EC = E (C, X f,)
in which
EC = electrical conductivity, pS/ cm
Ci = concentration of ionic specie i in solution, mg / L
fi = conductivity factor for ionic specie i
4. Example 1
Given the following analysis of a water sample, estimate the EC value in ij S/cm and
mS/m.
Cations: Ca2+
= 85.0 mg/L, Mg2+
= 43.0 mg/L, K+
= 2.9 mg/L, Na+
= 92.0 mg/L
Anions: HC03" =362.0 mg/L, Cl"=131.0 mg/L, S04
2
"=89.0 mg/L, N03"=20.0 mg/L
Calculate the electrical conductivity of each ion using the data given in Table 3.
Table 3 Ion specific conductivity's
Ion
Cone.
mg/L
Factor
pS/cm per mg/L
Conductivity
pS/cm
Ca'+
85.0 2.60 221.0
Mg*+
43.0 3.82 164.3
K+
2.9 1.84 5.3
Na+
92.0 2.13 196.0
HC03" 362.0 0.716 258.8
c r 131.0 2.14 280.3
SO42
" 89.0 1.54 137.1
N03 20.0 1.15 23.0
[Total 1285.8
Electrical Conductivity = 1285.8 fjS/cm = 1285.8 X 0.1 = 128.58
mS/m (Table 1).
8 Use of EC measurement
• Check purity of distilled or de-ionised water
Table 4 Gradation of water for laboratory use.
Gradation of Water Use of water EC (mS/m)
Type I use at detection limit of method <0.01
Type II routine quantitative analysis <0.1
Type III washing and qualitative analysis <1
• Relations with many individual constituents and TDS can be established.
The relationship between TDS (mg/L) and EC (pS/cm) is often described by a
constant, that varies according to chemical composition: TDS = A x EC, where A
is in the range of 0.55 to 0.9. Typically the constant is high for chloride-rich
waters and low for sulphate rich waters.
• Check deterioration of samples in time (effect of storage)
If EC is checked at time of sampling and again prior to analysis in the laboratory,
the change in EC is a measure for the 'freshness' of the sample.
5. Example 2
For the water sample given in the example 1, calculate TDS and the corresponding
constant 'A'.
Ion
Cone.
Ion
Mg/L
Ca^+
85.0
43.0
K+
2.9
Na+
92.0
HC03 362.0
CI 131.0
S04"- 89.0
N03" 20.0
I = 824.9
TDS in the sample = 824.9 mg/L. EC value = 1285.8 pS/cm.
TDS
824.9
= A x EC
= Ax 1285.8
= 0.64
6. OPERATION OF CONDUCTIVITY METER
Measurement of the conductivity
1 .Connect the conductivity electrode to the measuring instrument.
2.Press the < 0>key. (display test appears briefly on the display, after this, the
measuring instrument automatically switches to the measuring mode.)
3.Select the parameter (TDS, Salinity, Conductivity) by pressing <M>key.
4. Immerse the electrode in the water sample.
5. Press <AR> Key to activate auto read.
6. Press <Run/Enter> Key to start the auto read measurement, AR flashes on the
display until a stable measured value is reached, this can be terminated at any time with
<Run/Enter> Key.
Storing the data
1.Press the <STO>key in the measuring mode (display number with the number of the
next free memory location).
2. Press <Run/Enter>key.
3. Enter the ID number with <V >< A>.
4.Terminate the save with <Run/Enter>key.
To see the data memory
1 Press <RCL>Key.(display SEr disp)
2.Press <Run/Enter>key (display number at which data store)
3.Press <Run/Enter>key (display identification number).
4.Press <Run/Enter>key (display day, month)
5.Press <Run/Enter>key (display time)
6.Press <M>key to return in measuring mode.
Calibration
1.Connect the conductivity Electrode to the measuring instrument.
2.Immerse the electrode in the electrolyte solution provided with the instrument.
2.Press the <Cal>in the measuring mode (display Cell).
3. Press <Run/Enter>key (display CAL and cell constant value ,it should be 0.450-
0.500Cm"1
)
note :- At this point ,this procedure can be terminated with<M>.
Precautions
1. Always keep the electrode dry before and after use with absorbent paper.
Need to Calibrate after a fixed interval.