Determination of mercury traces by differential-pulse stripping voltammetry after sorption of mercury vapour on a gold-plated electrode |
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Authors: | Fritz Scholz Lutz Nitschke Günter Henrion |
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Institution: | Wissenschaftsbereich Analytik, Sektion Chemie, Humboldt-Universität, 1040 Berlin, Hessische Straβe 1-2 German Democratic Republic |
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Abstract: | Trace mercury is reduced with tin(II) to mercury metal, which is volatilised by bubbling air through the solution. A certain fraction of this mercury is sorbed on a rotating gold disk electrode and stripped in a thiocyanate solution. The detection limit is about 30 ng Hg(II) in solution; the relative standard deviation is 6% for 100 ng Hg(II) (n = 7). The detection limit for mercury in air is 1.7 ng l?1 with a preconcentration time of 10 min. |
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