Indicator metal electrodes in Potentiometry analysis
In potentiometry, metal electrodes are used as indicator electrodes to measure the potential difference between the indicator electrode and a reference electrode. The potential difference is proportional to the concentration of the analyte in the solution.
Some common metal electrodes used as indicator electrodes in potentiometry include:
- Silver/silver chloride electrode (Ag/AgCl): This electrode is commonly used as a reference electrode and an indicator electrode in many potentiometric measurements.
- Platinum electrode: This electrode is often used as an indicator electrode in acid-base titrations and in the determination of certain ions, such as iodide and bromide.
- Gold electrode: This electrode is used as an indicator electrode in the determination of thiols and in the analysis of gold-containing samples.
- Mercury electrode: This electrode is used as an indicator electrode in the determination of many analytes, including heavy metals and organic compounds.
- Copper electrode: This electrode is used as an indicator electrode in the determination of certain ions, such as cyanide and sulfide.
The choice of indicator electrode depends on the nature of the analyte and the conditions of the measurement. Different electrode materials may have different sensitivities and selectivities for specific analytes.
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