导数示波极谱法测定锡铅  

DERIVATIVE OSCILLOPOLAROGRAPHIC DETERMINATION OF MICROAMOUNTS OF LEAD AND TIN

作　　者：李朝均[1] 黄淑英[1] 

机构地区：[1]四川省卫生防疫站,成都610031

出　　处：《理化检验（化学分册）》1999年第12期554-556,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：在H_2SO_4-H_2C_2O_4介质中,用示波极谱法.Pb(Ⅱ)和Sn(Ⅳ)-DPG体系可产生灵敏的络合吸附波.铅和锡的浓度分别在0.08～1.6mg·L^(-1)和0.01～0.4mg·L^(-1)范围内与各自的导数波高呈线性关系,检出限分别为0.01mg·L^(-1)和0.002mg·L^(-1),并用于硬聚氯乙烯饮用水管材和管件酸浸泡液及饮用水中微量铅和锡的测定,结果满意.同时,测得Sn(Ⅳ)-C_2O_4^(2-)-DPG电活性络合物的组成为[Sn(C_2O_4)_3]^(2-):DPG=1:1,对极谱波的性质和电极过程机理进行了研究.In a medium of H_2SO_4-H_2C_2O_4, sensitive adsorptive complex waves of Pb( I ) and Sn( R ) with diphenylguanidine are produced. The peak current is linearly related to the concentrations of lead and tin in the range of 0. 08~1.6mg ·L^(-1) for Pb and 0. 01~0. 4mg ·Sn. Detection limits obtained are 0.01mg ·L^(-1) for lead and 0. 002mg ·L^(-1) for tin respectively. The proposed method has been applied to the simultaneous determination of microamoums of lead and tin in the acid extraction solution in unplasticized ployuinyl chloride (PVC-U) pipes and fittings for drinking water and in the natural water with satisfactory results. The composition of complex of Sn( IV )-C_2O^(2-)_4-DPG system was estimated to be [Sn(C_2O^(2-)_4 )]^(2-):DPG=1:1. The mechanism of the electrode reaction was also studied.

关 键 词：测定 草酸 二苯胍 铅 锡 配合吸附波 

分 类 号：O614.433[理学—无机化学] O614.432[理学—化学]