高等学校化学学报

高等学校化学学报 ›› 1987, Vol. 8 ›› Issue (3): 226.

• 研究简报 • 上一篇    下一篇

光化学反应在分析化学中应用的研究--利用铜(Ⅱ)的阻化作用测定微量铜

刘士斌, 门瑞芝, 朴铁花   

  1. 吉林大学化学系
  • 收稿日期:1985-08-06 出版日期:1987-03-24 发布日期:1987-03-24

Photochemical Reaction to the Application of Analytical Chemistry--Determination of Copper(Ⅱ) Based on Its Inhibitory Effect

Liu Shibin, Men Ruizhi, Piao Tiehua   

  1. Department of Ghemiatry, Jilin University, Changchun
  • Received:1985-08-06 Online:1987-03-24 Published:1987-03-24

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摘要： 在酸性介质中,碘离子在紫外光照射下产生的碘分子,与体系内预先加入的一定量的Na2S2O3作用,当Na2S2O3作用完后,再产生的碘分子将使淀粉指示剂显色。蓝色出现的时间与Na2S2O3的含量有关。某些金属离子对此反应会起加速作用,且反应速度的改变与金属离子浓度呈良好的线性关系。我们在研究应用上述体系测定环境样品中微量铬(Ⅵ)时发现,铜(Ⅱ)对此反应有明显的阻化作用。本文研究了利用铜(Ⅱ)的光阻化作用测定铜的可能性和确定光照时间与铜(Ⅱ)浓度的定量关系。

Abstract: Copper(Ⅱ) can effectively inhibit the photo-induced reaction of I2formation. Since there exists a quantitative relationship between irradiated time to the end-point versus concentration of copper(Ⅱ), therefore copper (Ⅱ) contained in samples can be quantitatively determined.The optimal experimental conditions have been examined. The interference behaviour of about 20 foreign ions were observed. This new method for the determination of micro-copper (Ⅱ) has been used in the analysis of tap water, lake water and cabbage samples and satisfactory result was obtained.The end-point was determined by "die-stop titration" method. The data were processed with a micro-computer,using a program written for lagrange's interpolation formula fitting to the nonlinear calibration curve.

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