Studies on Polarographic Adsorption Wave of Lead-Strontium-Chlorophosphonazo Ⅲ Complex and Its Analytical Application

Abstract

Abstract: In the solution of NaNO₂, the complex of Pb²⁺-CPAⅢ(chlorophosphonazo Ⅲ) gives a polarographic adsorptive wave which is relative to [Pb²⁺] at-0. 60 V(vs. SCE) in single-sweep oscillopolarograph. The presence of Sr²⁺ion results in an increase of sensitivity, a good stability and negative shift of the peak potential to -0.61 V(vs. SCE) under certain conditions, and a new sensitive method for the determination of trace lead by this polarographic adsorptive wave is thus established. The detection Limit of this method is 1.0 ×10^-6 mol/L Pb²⁺.

Key words: Ternary-binuclear-complex, Polarographic adsorptive wave, Chlorophosphonazo Ⅲ, Lead

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Cai Qian-tao, Peng Zhang-zhu, Shi Wen-zhao . Studies on Polarographic Adsorption Wave of Lead-Strontium-Chlorophosphonazo Ⅲ Complex and Its Analytical Application[J]. Chem. J. Chinese Universities, 1991, 12(6): 731.

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Studies on Polarographic Adsorption Wave of Lead-Strontium-Chlorophosphonazo Ⅲ Complex and Its Analytical Application

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