Determination of lead and cadmium in zinc chloride-ammonium chloride electrolyte system by anodic stripping voltammetry
MU Peng-tao1,SHEN Qing-feng2,YU Xiao-hua2,XU Shuang-quan2,LIU Chun-xia*1
1.Research Center for Analysis and Measurement, Kunming University of Science and Technology, Kunming 650093, China; 2.Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
Abstract：The simultaneous determination of Pb2+ and Cd2+ in ZnCl2-NH4Cl 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 0.015 V/s. Pb2+ and Cd2+ showed sensitive stripping peaks at -0.48 V and -0.68 V, respectively. The common ions in solution had no interference with the determination. The concentration of Pb2+ and Cd2+ in range of 9.7×10-9-2.4×10-4 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-NH4Cl 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.
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MU Peng-tao,SHEN Qing-feng,YU Xiao-hua,XU Shuang-quan,LIU Chun-xia. Determination of lead and cadmium in zinc chloride-ammonium chloride electrolyte system by anodic stripping voltammetry. , 2016, 36(4): 17-22.
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