高等学校化学学报 ›› 1991, Vol. 12 ›› Issue (6): 731.

• 论文 • 上一篇    下一篇

铅-锶-偶氮氯膦Ⅲ体系极谱吸附波的研究及应用

蔡乾涛, 彭掌珠, 施文赵   

  1. 华中理工大学化学系, 430074
  • 收稿日期:1989-12-06 出版日期:1991-06-24 发布日期:1991-06-24
  • 通讯作者: 蔡乾涛
  • 基金资助:

    国家自然科学基金

Studies on Polarographic Adsorption Wave of Lead-Strontium-Chlorophosphonazo Ⅲ Complex and Its Analytical Application

Cai Qian-tao, Peng Zhang-zhu, Shi Wen-zhao   

  1. Department of Chemistry, Huazhong University of Science and Technology, Wuhan, 430074
  • Received:1989-12-06 Online:1991-06-24 Published:1991-06-24

摘要: 在NaNO2底液中,Pb2+与偶氮氯磷Ⅲ形成2:1的络合物,于-0.60V(vs.SCE)处产生一与Pb2+浓度有关的极谱吸附波。加入Sr2+后,形成铅-锶-偶氮氯膦Ⅲ三元异双核络合物,其极谱波灵敏度增加、稳定性更好,峰电位负移至-0.61V。利用此波建立了测定痕量铅的极谱吸附波分析法,用以测定蕃茄叶标样(美国NBS,SRM-1573)中痕量铅,结果良好。还研究了此络合物组成及极谱波性质。

关键词: 三元异双核络合物, 极谱吸附波, 偶氮氯膦Ⅲ,

Abstract: In the solution of NaNO2, the complex of Pb2+-CPAⅢ(chlorophosphonazo Ⅲ) gives a polarographic adsorptive wave which is relative to [Pb2+] at-0. 60 V(vs. SCE) in single-sweep oscillopolarograph. The presence of Sr2+ion results in an increase of sensitivity, a good stability and negative shift of the peak potential to -0.61 V(vs. SCE) under certain conditions, and a new sensitive method for the determination of trace lead by this polarographic adsorptive wave is thus established. The detection Limit of this method is 1.0 ×10-6 mol/L Pb2+.

Key words: Ternary-binuclear-complex, Polarographic adsorptive wave, Chlorophosphonazo Ⅲ, Lead

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