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Electrochemical Analyses and Redox Titration
Coulometry and Electrical Charge Analysis
Description
Coulometry is an analytical method that finds the amount of an analyte by measuring the electrical charge needed for its complete electrolysis. It is known for being rapid, accurate, and precise. Unlike many other methods, it does not require analytical standards.
The total charge passed during e...
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Transcript
库仑分析法利用完全电解分析物所需的电量来确定其含量,无需使用任何分析标准品。
电解过程中通过的总电荷量与分析物的量之间遵循法拉第电解定律。
为了实现高效的库仑测量,每摩尔在电极上发生转化的分析物,必须提供相当于法拉第常数乘以相关半反应中所涉及电子数的电荷量。
库仑分析法采用恒定电流或受控电位。
恒电流库仑法通过向体系施加恒定电流,测量随时间通过电解池的电荷量。
在控制电位库仑分析中,向体系施加恒定电位,并通过测量随时间变化的电流来测定通过电解池的电量。
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