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铜-四(4-甲氧基-3-磺酸苯基)卟啉络合物在0.1mol/L KOH溶液中,在-1.25V(vs.SCE)有一灵敏的吸附还原峰,峰高与Cu~(2+)浓度在3.1×10~(-9)～1.5×10~(-7)mol/L范围内呈线性关系。检出限达8×10~(-10)mol/L(富集2min)。本文详细讨论了测定铜的最佳条件,并对试剂及其铜络合物在悬汞电极上的伏安特性和吸附行为作了探讨。此法用于工业硫酸锌盐中微量铜的测定,结果与光度法、原子吸收法一致。
Copper (Ⅳ) -tetrakis (4-methoxy-3-sulfophenyl) porphyrin complex has a sensitive adsorption-reduction peak at -1.25 V (vs.SCE) in 0.1 mol / L KOH solution. The concentration of Cu 2+ showed a linear relationship in the range of 3.1 × 10 ~ (-9) ~ 1.5 × 10 ~ (-7) mol / L. The detection limit of 8 × 10 ~ (-10) mol / L (enrichment 2min). In this paper, the optimum conditions of copper determination are discussed in detail, and the voltammetric behavior and adsorption behavior of the reagents and their copper complexes on the hanging mercury electrode are discussed. This method is used for the determination of trace copper in industrial zinc sulfate salt. The result is consistent with the photometric method and atomic absorption method.