What is stripping voltammetry? Taking a suitable example discuss the anodic
stripping voltammetry.
Stripping voltammetry is a group of electroanalytical techniques used to detect and quantify trace concentrations of various analytes, such as heavy metals, ions, and organic compounds. These techniques are based on the principles of electrochemical analysis, where the redox reactions of the analyte are exploited to provide information about its concentration. Stripping voltammetry can be further divided into anodic stripping voltammetry and cathodic stripping voltammetry, depending on whether the analyte is deposited on the electrode surface before or after its electrochemical reduction or oxidation.
Anodic stripping voltammetry (ASV) is a widely used electroanalytical method that specifically focuses on the electrochemical oxidation of the analyte of interest. It is particularly valuable for the analysis of trace metals in various samples, including environmental, biological, and industrial matrices. ASV involves three main steps: accumulation, cleaning (stripping), and measurement.
1. Accumulation: In this step, the analyte ions are accumulated on the working electrode surface through a process called preconcentration. An appropriate potential is applied to the working electrode, causing the analyte ions to electrostatically adsorb or form a complex with the electrode surface. The duration of this step can vary depending on the analyte's concentration and the electrode material but typically
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