New methodology for anodic stripping voltammetric determination of methylmercury |
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Institution: | Faculty of Chemistry, Maria Curie-Sklodowska University, M.C. Sklodowska square 3, 20-031 Lublin, Poland |
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Abstract: | A novel procedure for trace methylmercury determinations by anodic stripping voltammetry at a gold film electrode is presented. Measurements were performed in a flow system. For selective determination of methylmercury, the Hg2+ ions were masked by complexation with DTPA. Hg-DTPA complex is not reduced at the gold film electrode at the potential of methylmercury reduction to the metallic state. The calibration graph was linear from 5 × 10?9 to 1 × 10?7 mol L?1 for an accumulation time 600 s. A detection limit (based on 3σ criterion) for methylmercury was 2.3 × 10?9 mol L?1. The validation of the proposed procedure was made by analyses of human hair certified reference material. |
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