Reagent optimization for on-line simultaneous polarographic determination of trace amounts of Cu²⁺, Cd²⁺ and Co²⁺ in the presence of anextremely large excess of Zn²⁺

Abstract

Reagents are optimized for the simultaneous determination of trace amounts of Cu²⁺, Cd²⁺ and Co²⁺ in zinc sulfate solution, which contains an extremely large excess of Zn²⁺. First, the reagents and their doses for the experiment are selected according to the characteristics of the zinc sulfate solution. Then, the reagent doses are optimized by analyzing the influence of reagent dose on the polarographic parameters (i.e. half-wave potential E_1/2 and limiting diffusion current I_p). Finally, the optimization results are verified by simultaneously determining trace amounts of Cu²⁺, Cd²⁺ and Co²⁺ in the presence of an extremely large excess of Zn²⁺. The determination results indicate that the optimized reagents exhibit wide linearity, low detection limits, high accuracy and good precision for the simultaneous determination of trace amounts of Cu²⁺, Cd²⁺ and Co²⁺ in the presence of an extremely large excess of Zn²⁺.

Keywords

on-line simultaneous determination / trace polymetallic ions / reagent optimization / high concentration ratio

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