高等学校化学学报

高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (10): 1873.

• 研究论文 • 上一篇    下一篇

二苯碳酰二肼柠檬酸盐光度法快速测定水中铬(Ⅵ)

陈焕文, 徐抒平, 于爱民, 金钦汉   

  1. 长春分析仪器研究和技术开发中心, 吉林大学化学学院, 长春 130023
  • 收稿日期:2001-05-26 出版日期:2002-10-24 发布日期:2002-10-24
  • 通讯作者: 金钦汉(1937年出生),男,教授,博士生导师,主要从事光谱分析研究.

In situ Rapid Determination of Chromium(Ⅵ) in Water Using Portable Photometer and Diphenylcarbazine Citrate

CHEN Huan-Wen, XU Shu-Ping, YU Ai-Min, JIN Qin-Han   

  1. Changchun R &D Center for Analytical Instruments, College of Chemistry, Jilin University, Changchun 130023, China
  • Received:2001-05-26 Online:2002-10-24 Published:2002-10-24

PDF (PC)

被引次数

25

摘要： 合成了一种二苯碳酰二肼柠檬酸盐,建立了基于这种试剂和手持式光度计的铬(Ⅵ)的快速现场测定方法.在弱酸性介质中,此试剂与铬(Ⅵ)形成紫红色产物,λmax=540nm,摩尔吸光系数ε=3.32×104L·mol-1·cm-1,铬(Ⅵ)含量在0.03～2.00mg/L内符合比尔定律.该法用于电镀废水中铬(Ⅵ)的快速测定,结果令人满意.

关键词: 现场光度法, 手持式光度计, 铬(Ⅵ), 二苯碳酰二肼柠檬酸盐

Abstract: The trace Cr(Ⅵ) is usually determined by colorimetry using diphenylcarbazine, which is not able to be dissolved in water. In this paper, the diphenylcarbazine citrate was synthesized and the solubility of the diphenylcarbazine citrate was improved notably. Therefore, a new rapid spectrometry for Cr(Ⅵ) determination in situ was established using the reagent newly synthesized and the portable photometer made in our lab. In the weak acid medium, diphenylcarbazine citrate is colored by Cr(Ⅵ) to form a magenta-colored complex as the diphenylcarbazine usually does. The molar absorptivity for Cr(Ⅵ) is 3.32×104 L·mol-1·cm-1 at 540 nm, and the Beer's law is obeyed in the range of 0.03-2.00 mg/L. All the analysis can be completed within 3 minutes. Contents of Cr(Ⅵ) in electroplating waste water and industrial waste water were determined in situ, and all the results were satisfactory.

Key words: In situ spectrometry, Portable photometer, Cr(Ⅵ), Diphenylcarbazine citrate

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