锡-向红菲啰啉络合物的1.5次微分吸附伏安法研究

Study on the 1. 5th Order Differential Adsorption Voltammetry of Tin-Bathophenanline Complex

本文研究了锡-向红菲啰啉体系在悬汞电极上的伏安行为,在pH＝2.80的0.07mol/L氯乙酸-氯乙酸钠介质中,Sn(IV)-向红菲啰啉络合物于1.5次微分伏安图上在-0.56V(us.SCE)电位处产生一良好的吸附还原波,波高与Sn(IV)的浓度在5.0×10^(-9)~6.O×10^(-7)mol/L范围内呈线性关系,检出下限为2.5×10^(-9)mol/L Sn(IV),用本法对冶金标样中锡进行测定,取得了满意的结果.

The electrochemical behavior of tin-4,7-diphenyl-1,10-phenanthroline(BPT) system at a hanging mercury electrode was investigated in a buffer solution of 0. 07 mol/L ClCH2COOH-ClCH2COONa (pH = 2. 80), the Sn(Ⅳ)-BPT complex produces a reduction peak at -0. 56 V(vs.SCE) on the 1. 5th order differential linear sweep voltammetric curve. The detection limit and linear range of tin are 2. 5×10-9 mol/L and 5. 0×10-9-6. 0×10-7 mol/L respectively. This method has been applied to the determiantion of tin in metallic standardized samples.