极谱法测定高纯氧化铋中微量铅的方法研究  

determination of Trace Lead in High Purity Bismuth Oxide by Polarography

作　　者：黄坚[1] 龚竹青[2] 晏超[1] 

机构地区：[1]中南大学化学化工学院,长沙410083 [2]中南大学冶金科学与工程学院,长沙410083

出　　处：《分析试验室》2005年第10期34-36,共3页Chinese Journal of Analysis Laboratory

摘　　要：在HCl-NaAc底液中, 铅(Ⅱ)与碘(Ⅰ)可生成稳定络合物,并且能在滴汞电极表面被吸附,产生灵敏的络合吸附波,示波极谱的峰电位(vs.SCE)为-0.55 V.本法测定铅的检出限为5.67×10-9 mol/L,线性范围为1.93×10-7～2.90×10-6 mol/L.方法可用于测定高纯氧化铋中的微量铅.本文还对铅(Ⅱ)与碘(Ⅰ)络合吸附波的性质进行了讨论.Abstract： In HCl-NaAc buffer solution, Pb^2＋ with Ⅰ^- can form stable compounds adsorbed on the surface of a mercury dropping electrode and produce a sensitive polarographic wave with peak potential at -0.55 V （vs. SCE）. The derivative peak height is directly proportional to the lead concentration in the range of 1.93 × 10^-7 - 2.90 × 10^-6 mol/L and the detection limit is 5.67 × 10^-9 mol/L. The method was used to determine the trace lead in high purity Bismuth oxide with satisfactory resuits. The characteristic of the adsorption wave of Pb^2＋ with Ⅰ^- was discussed in details.

关 键 词：铅 氧化铋 碘络合物 极谱 吸附波 

分 类 号：O657.12[理学—分析化学]