What is Karl Fischer coulometric titration?
Karl Fischer titration is a classic titration method in chemical analysis that uses coulometric or volumetric titration to determine trace amounts of water in a sample. It was invented in 1935 by the German chemist Karl Fischer. Today, the titration is done with an automated Karl Fischer titrator.
What is a coulometric titration?
Coulometric titration is an absolute determination technique in which the mass of a given substance is determined by measuring the quantity of electricity required to electrolyze that substance; it does not necessarily require a standard solution. Thus the technique allows high-sensitivity measurements.
Which electrode is used in Karl Fischer titration?
The most advanced KF titration technology uses a double platinum electrode for electrochemical indication of the end point, but visual and photometric indicators are also used.
How many types of Karl Fischer titration are there?
There are two types of Karl Fischer titrators: volumetric and coulometric titrators. The main difference between the two is that with the volumetric method, the titrant is added directly to the sample by a burette.
What is the unique property of coulometric titration?
Coulometric titration has the advantage that constant current sources for the generation of titrants are relatively easy to make. The electrochemical generation of a titrant is much more sensitive and can be much more accurately controlled than the mechanical addition of titrant using a burette drive.
What is the basis of coulometric?
Coulometry is based on an exhaustive electrolysis of the analyte. By exhaustive we mean that the analyte is completely oxidized or reduced at the working electrode or that it reacts completely with a reagent generated at the working electrode.
Why Methanol is used in KF?
Methanol is typically used as the working medium in the titration cell. One-component volumetric reagents are easier to handle, and are usually less expensive than two-component reagents.
How do you calculate water factor?
Calculate the water equivalence factor, F, in mg of water per mL of reagent, by the formula: W/V, in which W is the weight, in mg, of the water; and V is the volume, in mL, of the reagent required.
What is coulometric analysis?
Coulometric analysis is an electrochemical method, in which an analyte of interest is exhaustively electrolysis adjacent to the surface of electrode [1].
What is Karl Fisher analysis?
The Karl Fischer method is used for many substances as a reference method. It is a chemical analysis procedure which is based on the oxidation of sulfur dioxide by iodine in a methanolic hydroxide solution.
What is Karl Fischer titration?
A Karl Fischer Titrator. Karl Fischer titration is a classic titration method in analytical chemistry that uses coulometric or volumetric titration to determine trace amounts of water in a sample.
What is coulometric titration?
Definition of coulometric titration. : a method of titration in which the titrating agent is produced in a solution by electrolysis and the required amount of the agent is determined by measuring the number of coulombs used in preparing it.
