应用化学 ›› 1987, Vol. 0 ›› Issue (4): 61-65.

• 研究简报 • 上一篇    下一篇

铜-丁二酮肟-四硼酸钠体系络合吸附波的研究

李启隆, 刘京鹏   

  1. 北京师范大学化学系
  • 收稿日期:1986-07-15 修回日期:1986-09-05 出版日期:1987-08-10 发布日期:1987-08-10
  • 基金资助:
    教育部重点科学技术研究课题

STUDIES ON POLAROGRAPHIC ADSORPTIVE COMPLEX WAVE OF COPPER-DMG-Na2B4O7 SYST EM

Li Qilong, Liu Jingpeng   

  1. Department of Chemistry, Beijing Normal University
  • Received:1986-07-15 Revised:1986-09-05 Published:1987-08-10 Online:1987-08-10

摘要: ΠpoxopoBa等曾研究铜-丁二酮肟(DMG)-氨缓冲溶液体系的dc极谱行为。他们认为pH9.35,铜离子浓度3.5×10-4M,DMG浓度≤7×10-4M时是个扩散波(E1/2=-0.3V);当DMG浓度较大时,波呈峰形(Ep=0.5V),是个催化氢波。他们尚未研究该体系的灵敏度及其应用。我们用单扫示波极谱研究了铜-DMG-Na2B4O7,体系的极谱行为。铜一DMG络合物在Na2B407缓冲溶液(pH9.4)中还原,产生良好的示波极谱图,Ep=-0.34V(vs.SCE)。其峰电流与铜的浓度在5×10-8-3×10-8M范围成正比,并应用于污水中微量铜的测定。用连续变化法确定络合物的络合比Cu(II):DMG=1:2。用循环伏安法等手段研究该波的性质及其机理,并测定了不同铜浓度时体系的吸附量。实验表明,所研究体系的极谱波属于络合吸附波。

Abstract: In a supporting electrolyte containing 2?10-4M DMG, 0.025M Na2B4O7 at pH=9.4, a sensitive adsorptive complex wave of copper-DMG was obtained by using single-sweep polarography. The peak potential is -0.34V(vs.SCE). The peak height changes linearly with the concentration of copper in the range of 5?10-8 to 3?10-6M. The method has been applied successfully for the trace copper determination in waste water.