Abstract
A remarkably sensitive cathodic stripping voltammetric procedure for ultratrace measurements of selenium in the presence of added rhodium is described. The method is based on the accumulation and subsequent reduction of a Rh 2Se 3 layer on the hanging mercury drop electrode. Optimum experimental conditions were established, including the use of a 0.1 M sulfuric acid solution containing 10 μg1 −1 rhodium and preconcentration at −0.2 V followed by a fast linear scan. Such conditions yield an extremely low detection limit of 0.5 ng 1 −1 (6 x 10 −12 M) selenium following a 3-min preconcentration. The improved sensitivity (over earlier cathodic stripping voltammetric schemes) is coupled to high selectivity and precision. Applicability to assays of groundwater and river water samples is illustrated.
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