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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.
In this paper, the voltammetric behavior of tin-red-phenanthroline system at the mercury-suspended electrode was investigated. In the 0.07mol / L sodium chloroacetate-sodium chloroacetate solution at pH = 2.80, the Sn (IV) The results showed that a good adsorption reduction wave was produced at a potential of -0.56V (us.SCE) on the 1.5th differential voltammogram. The wave height and concentration of Sn (IV) were between 5.0 × 10 ~ (-9) ~ 6.0 × 10 ~ (-7) mol / L. The lower limit of detection was 2.5 × 10 -9 mol / L Sn (IV). The content of tin in the metallurgical standard sample was determined by this method. Satisfying result.