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By completely converting the analyte from one oxidation state to another, coulometry is an analytical method for measuring an unknown concentration of an analyte in solution.
Coulometry is an absolute measurement that does not require chemical standards or calibration, like gravimetry or titration. Therefore, it is useful for determining standards’ absolute concentration.
At an electrode, it is extremely challenging to completely oxidize or reduce a chemical species due to concentration polarization.
Therefore, an intermediate reagent that quantitatively reacts with the analyte is typically used for coulometry.
In order to avoid concentration polarization, an excess of a precursor is used to electrochemically generate the intermediate reagent.
The electrochemical transformation of I-, the precursor, into I2 (the intermediate reagent) is one example.
The chemical oxidation of organic compounds like ascorbic acid can then be accomplished with I2.The endpoint, which is the point at which all of the analyte has changed to the new oxidation state, is determined by some indicator that is also in the solution.
Starch is the indicator for the coulometric titration of ascorbic acid. A dark purple complex is formed when I2 binds to the starch at the endpoint and remains in solution.
The reaction stoichiometry and the amount of charge required to produce enough reagent to react with the analyte in its entirety are used to determine the analyte concentration.
The Global coulometry market accounted for $XX Billion in 2023 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2024 to 2030.
Metrohm presents the 899 Coulometer, the most minimal and adaptable Coulometer from Metrohm.
Because it has its own built-in magnetic stirrer, the 899 Coulometer doesn’t need much space. There is no requirement for a help pole by the same token. The titration cell is securely supported on the instrument’s upper side by an integrated holder.
Is there no place to plug the power cord into? With the 899 Coulometer, there is no issue. In this instance, users can rely on the instrument’s independent power supply, which is provided by an optional Power Box with a battery set. This implies clients can perform coulometric judgments of the water content anyplace they need.
The 899 Coulometer, on the other hand, has the capabilities of a fully developed Metrohm Coulometer.
As a result, it can be connected to an 885 Compact Oven Sample Changer or a manual oven (860 KF Thermoprep) for fully automated thermal sample preparation and subsequent coulometric water content determination.
