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Anodic stripping voltammetry.
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Anodic stripping voltammetry (ASV) is an electroanalytical technique used to determine the concentration of trace metals in a sample. It involves three steps:
1. Preconcentration: The analyte metal ions are deposited onto a working electrode (often a hanging mercury drop electrode) by applying a negative potential. This forms an amalgam of the metal with mercury.
2. Stripping: The potential is then reversed, and the metal is oxidized back into solution. This oxidation process generates a current peak proportional to the amount of metal deposited.
3. Detection: The current peak is measured and used to quantify the concentration of the analyte metal in the original sample.
ASV is highly sensitive and can detect metals at concentrations as low as parts per billion (ppb). It's widely used in environmental monitoring, food safety, and clinical analysis.
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