Determination of traces of palladium by adsorptive stripping voltammetry of the dimethylglyoxime complex |
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Authors: | Joseph Wang Kurian Varughese |
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Institution: | Department of Chemistry, New Mexico State University, Las Cruces, NM 88003 U.S.A. |
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Abstract: | Preconcentration is achieved by adsorption of a palladium-dimethylglyoxime complex on a hanging mercury drop electrode. Optimal conditions area stirred acetate buffer solution (pH 5.15) containing 2 × 10?4 M dimethylglyoxime and an accumulation potential of —0.20 V. The height of the stripping peak in a negative-going linear scan is linearly dependent on palladium concentration and preconcentration time (over the ranges 0–16 μg l?1 and 0–300 s, respectively). For a 10-min preconcentration time, the detection limit is 20 ng l?1 (2.1 × 10?10 M). Possible interferences by other trace metals are investigated. Palladium added to seawater samples was easily quantified. |
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