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The combination of ion chromatography and inductively coupled plasma mass spectrometry (IC-ICP/MS) is ideally suited for the detection of species of arsenic and mercury in their various oxidation levels and forms of chemical bonding. However, some species – as in the case of mercury – are reciprocally converted into one another during sample preparation, thus making a determination of the initial concentrations of the heavy metal species impossible. This article shows how these interconversions can be calculated with isotope dilution analysis and IC-ICP/MS in accordance with EPA method 6800.

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