Studies on Electrochemical Analysis of Precious Metals (Ⅸ)--Determination of Micro-Rhodium by ASV

Abstract

Abstract: We used the cation exchange resin as enrichment to separate rhodium which has been successfully determined in the samples. Anew and simple system of determinating Rh at a glass carbon electrode by anodic stripping voltammetry (ASV) was studied. The optimum supporting electrolytic system was 0.07mol·dm^-3H₂SO₄-HgCl₂.Between quantitative orders of Rh³⁺from 10^-10g/m Lto 10^-7g/mL, the concentration on peak current is linear. The detection limit reached 0.1ng. The coefficient variation are 0.0057% and 0.0058% respectively with samples of chloridized residue and refined mineral for 6 replicate determinations. Results obtained by this method quite agree with that of other methods. The industrial waste water and second nickel anode mud were also determined. Its coefficient variations were 0.0087% and 0.010% respectively.The recovery rate of chloridized residue was in the range of 93-106%.

Key words: Precious metal, Electrochemical analysis, Rhodium, Anodic stripping voltammetry

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Zhang Yuxiang, Lu Fan, Duan Guiyun, Yang Wenxiu. Studies on Electrochemical Analysis of Precious Metals (Ⅸ)--Determination of Micro-Rhodium by ASV[J]. Chem. J. Chinese Universities, 1989, 10(2): 194.

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Studies on Electrochemical Analysis of Precious Metals (Ⅸ)--Determination of Micro-Rhodium by ASV

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