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Explain in detail anodic stripping voltammetry.(short questions)
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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 two steps:
1. Preconcentration: The analyte metal ions are deposited onto a working electrode (usually a hanging mercury drop electrode or a glassy carbon electrode) by applying a negative potential. This step concentrates the metal ions on the electrode surface.
2. Stripping: The potential is then scanned in a positive direction. As the potential becomes more positive, the deposited metal ions are oxidized and stripped from the electrode surface. The current generated during this oxidation process is measured as a peak, and the peak height is directly proportional to the concentration of the metal in the sample.
ASV is a very sensitive technique, capable of detecting metals at concentrations as low as parts per billion (ppb). It is commonly used in environmental monitoring, food analysis, and clinical chemistry.
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