【摘要】 采用阳极溶出伏安法,建立了在ZnCl2-NH4Cl体系中,使用乙二胺四乙酸二钠（EDTA）和磺基水杨酸消除Cu²⁺对Pb²⁺测定的影响,不经预分离同时测定溶液中Pb²⁺和Cd²⁺的方法。在扫描电位为-0.80^-0.30V、富集电位为-0.85V、富集时间为100s、扫描速率为0.015V/s的优化试验条件下,Pb²⁺和Cd²⁺分别在-0.48V和-0.68V处有灵敏的溶出峰。溶液中可能存在的常见离子不干扰测定。Pb²⁺、Cd²⁺浓度分别在9.7×10-9².4×10-4、1.8×10-8⁸.9×10-5 mol/L范围内与其峰电流呈良好的线性关系,相关系数分别为0.995和0.998。方法中Pb²⁺、Cd²⁺的检出限分别为3.9×10-9、1.9×10-9 mol/L。采用实验方法测定了ZnSO4电解液和ZnCl2-NH4Cl电解液中的Pb²⁺和Cd²⁺,结果的相对标准偏差（RSD,n=6）分别为0.83%².1%、0.56%⁰.75%,回收率分别为89%¹08%、92%¹04%。更多还原

【Abstract】 The simultaneous determination of Pb²⁺and Cd²⁺in ZnCl2-NH4 Cl system by anodic stripping voltammetry was established without pre-separation.The influence of Cu²⁺on the determination of Pb²⁺was eliminated using ethylene diamine tetraacetic acid（EDTA）and sulfosalicylic acid as masking agent.The optimal determination conditions were as follows:the scanning potential was-0.80^-0.30 V,the enrichment potential was-0.85 V,the enrichment time was 100 s,and the scanning rate was 0.015V/s.Pb²⁺and Cd²⁺showed sensitive stripping peaks at-0.48Vand-0.68 V,respectively.The common ions in solution had no interference with the determination.The concentration of Pb²⁺and Cd²⁺in range of9.7×10-9-2.4×10-4 and 1.8×10-8-8.9×10-5 mol/L showed good linearity to the peak current.The correlation coefficient was 0.995 and 0.998,respectively.The detection limit of Pb²⁺and Cd²⁺was 3.9×10-9 and 1.9×10-9 mol/L,respectively.The content of Pb²⁺and Cd²⁺in ZnSO4 electrolyte and ZnCl2-NH4 Cl electrolyte was determined by the proposed method.The relative standard deviation（RSD,n=6）was 0.83%-2.1% and 0.56%-0.75%,and the recoveries were 89%-108% and 92%-104%,respectively.更多还原