What is electroanalytical method in chemistry?
• Electroanalytical methods are a class of techniques in. analytical chemistry, which study an analyte by measuring the potential (volts) and/or current (amperes) in an electrochemical cell containing the analyte.
What are the types of Electroanalytical techniques?
The major electroanalytical methods include potentiometry, amperometry, conductometry, electrogravimetry, voltammetry (and polarography), and coulometry. The names of the methods reflect the measured electric property or its units.
What is the key difference between potentiometric and amperometric electroanalytical method?
The key difference between potentiometry and amperometry is that potentiometry measures the electric potential while maintaining a constant electric current between the two electrodes, whereas amperometry monitors electric current while keeping the potential constant.
What are the advantages of electroanalytical techniques?
Nowadays, electroanalytical methods are widely used in nanotechnological applications. They have unique features such as sensitivity, selectivity, rapid response, requirement of low volume of solutions and easy usage.
What is meant by coulometry?
Coulometry is an electrochemical method in which the total charge (the number of coulombs) consumed in the redox conversion of an analyte at an electrode is measured. It is not to be confused with colorimetry, the spectroscopic method.
What is the difference between coulometry and electrogravimetry?
In electrogravimetry, the product is weighed as a deposit on one of the electrodes. In coulometry, the quantity of electricity needed to complete the electrolysis is measured as coulombs. Both the methods are quite sensitive, rapid and accurate.
What is the principle of potentiometry?
Potentiometric Titration principle of Potentiometry Principle. When the pair of electrodes are placed in the sample solution or analyte, it shows the potential difference between two electrodes by the addition of the titrant or by the change in the concentration of ions.
What is potentiometric method of analysis?
Potentiometric titration belongs to chemical methods of analysis in which the endpoint of the titration is monitored with an indicator electrode that records the change of the potential as a function of the amount (usually the volume) of the added titrant of exactly known concentration.
How many electrodes are present in a coulometric analysis?
Instrumentation. Controlled-current coulometry normally is carried out using a two-electrode galvanostat, consisting of a working electrode and a counter electrode.
What are the types of coulometry?
There are two forms of coulometry: controlled potential coulometry and controlled-current coulometry. A three-electrode potentiostat is used to set the potential in controlled potential coulometry.