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.
出处
《分析试验室》
CAS
CSCD
北大核心
2005年第10期34-36,共3页
Chinese Journal of Analysis Laboratory
关键词
铅
氧化铋
碘络合物
极谱
吸附波
Lead
Bismuth oxide
Polarogram
Adsorption wave
