How are coulometric method of analysis applied?
Coulometric methods of analysis are based on an exhaustive electrolysis of the analyte. By exhaustive we mean that the analyte is quantitatively oxidized or re- duced at the working electrode or reacts quantitatively with a reagent generated at the working electrode.
What method is 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.
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].
How do coulometric titrations differ from conventional titrations?
The main difference between the two is that with the volumetric method, the titrant is added directly to the sample by a burette. Conversely, with the coulometric method, the titrant is generated electrochemically in the titration cell.
What are the two types of coulometry?
There are two forms of coulometry: Controlled potential coulometry, in which we apply a constant potential to the electrochemical cell, and 2. Controlled-current coulometry, in which we pass a constant current through the electrochemical cell.
What is the role of oxidation and reduction in coulometric titration?
Coupling the mediator’s oxidation or reduction to an acid–base, precipitation, or complexation reaction involving the analyte allows for the coulometric titration of analytes that are not easily oxidized or reduced. For example, when using H2O as a mediator, oxidation at the anode produces H3O+
What are controlled-current coulometric techniques?
Controlled-current coulometric techniques have been developed for a range of analytes that may be determined by conventional redox titrimetry (e.g., acid-base, precipitation, or complexation). Timothée Houssin, Vincent Senez, in Waterborne Pathogens (Second Edition), 2021
What is an exhaustive coulometry?
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. 3. 1. There are two forms of coulometry: Controlled potential coulometry, in which we apply a constant potential to the electrochemical cell, and 2.