锑电极电位溶出法测定锌、镉、铅  

Determination of Lead, Cadmium, Zinc Using Antimony Electrode by Potentiometric Stripping Analysis

作　　者：魏小平[1] 梁青梅[1] 李建平[1] 

机构地区：[1]桂林理工大学化学与生物工程学院,广西桂林541004

出　　处：《中国无机分析化学》2011年第4期19-23,共5页Chinese Journal of Inorganic Analytical Chemistry

基　　金：国家自然科学基金(No.21165007);广西自然科学基金(No.0728214)资助

摘　　要：提出了采用锑电极作为工作电极同时测定痕量重金属锌、镉、铅的电位溶出法。探讨了同时测定锌、镉、铅的最佳条件。在pH=5.0的HAc-NaAc缓冲溶液中,Zn2+、Cd2+、Pb2+分别在-1.07、-0.70、-0.52V得到灵敏的电位溶出峰。沉积时间为60s时,锌、镉、铅的质量浓度分别在0～16.0、0～1.6、0～0.08μg/mL范围内,与各自微分电位溶出峰高呈线性关系,检出限分别为4.0、0.3、0.03μg/L。测定了水样中痕量锌、镉、铅的含量,结果令人满意。Potentiome heavy metals（zinc, ca tric stripping analysis method was proposed dmium and lead） by use of antimony electrode for determination of trace amounts of as working electrode. The experimen tal conditions for simultaneous determination of zinc, cadmium and lead were optimized. In HAc-NaAc buffer solutions （pH=5.0）, the sensitive potentiometric stripping peaks （dt/dE） of Zn^2＋ ,Cd^2＋ ,Pb^2＋ ions were obtained as -1.07, -0.70 and -0.52 V, respectively. With the deposition time of 60 s, the potentiometric stripping peak value changed linearly with the ion concentrations in the range of 0 - 16.0 μg/mL, 0-1.6 μg/mL and 0-0.08 μg/mL for zinc, cadmium and lead, respectively. The detection limit of Zn^2＋ , Cd^2＋ and Pb^2＋ was 4.0, 0.3 and 0.03 μg/L, respectively. The method was applied to determine trace amounts of zinc, cadmium and lead in water samples with satisfactory results.

关 键 词：锑电极 电位溶出法 锌 镉 铅 

分 类 号：O657.1[理学—分析化学] TH832[理学—化学]