高等学校化学学报

高等学校化学学报 ›› 1993, Vol. 14 ›› Issue (6): 771.

• 研究论文 • 上一篇    下一篇

水中铬(Ⅵ)和铬(Ⅲ)的在线化学发光监测法

吕九如, 张新荣, 张八合, 秦伟, 章竹君   

  1. 陕西师范大学化学系, 西安 710062
  • 收稿日期:1992-10-14 修回日期:1993-02-28 出版日期:1993-06-24 发布日期:1993-06-24
  • 通讯作者: 吕九如.
  • 基金资助:

    国家自然科学基金

A Chemiluminescence Method for In-Line Monitor of Cr(Ⅵ) and Cr(Ⅲ) in Environmental Water

LU Jiu-Ru, ZHANG Xin-Rong, ZHANG Ba-He, QIN Wei, ZHANG Zhu-Jun   

  1. Department of Chemistry, Shanxi Normal University, Xian, 710062
  • Received:1992-10-14 Revised:1993-02-28 Online:1993-06-24 Published:1993-06-24

PDF (PC)

被引次数

28

摘要： 本文根据铬(Ⅵ)在酸性条件下可被H2O2还原为铬(Ⅲ)的性质,利用铬(Ⅲ)-H2O2-鲁米诺化学发光体系,建立了水中铬(Ⅵ)和铬(Ⅲ)的流动注射化学发光在线监测法。方法的检出限是4×10-11g/mL;线性范围为1×10-10～3×10-5g/mL;相对标准偏差小于2％(n=11)。此法操作简便、选择性较好,适用于环境水中铬(Ⅵ)和铬(Ⅲ)的实时性监测。

关键词: 铬(Ⅵ), 铬(Ⅲ), 化学发光分析, 实时性监测

Abstract: Achemiluminescenee method for in-line monitor of Cr(Ⅵ) and Cr(Ⅲ) in environmental water is proposed.The method is based on Cr(Ⅲ)-H2O2-luminoIchemiluminescence system.To determine Cr(Ⅲ) in sample, an anion-exchange column is used.Cr(Ⅲ) that passes through the column can be determined selectively by Cr(Ⅲ)-H2O2-luminol system.Cr(Ⅵ) can not be determined directly by this system because it can not react with H2O2 and luminol in alkaline medium.In order to determine Cr (Ⅵ), an cation-exchange column is used to separate Cr (Ⅵ) from Cr (Ⅲ) in sample.Cr (Ⅵ) that passes through the column is reduced into Cr(Ⅲ) by acidic H2O2 in the flow and determined subsequently with Cr(Ⅲ)-H2O2-luminol system in alkaline medium.By rotating the selecting-valve, Cr(Ⅲ) and Cr(Ⅵ) in sample can be determined alternatively.The method offers potential advantages of simplicity, selectivity and applicability to the determination of Cr(Ⅲ) and Cr(Ⅵ) in environmental water.The detection limit of the method is 4×10-11 g/mL Cr.The linear range is 10-5-10-10g/mL Cr.

Key words: Chromium(Ⅵ), Chromium(Ⅲ), Chemiluminescence analysis, Monitor in time

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