高等学校化学学报

高等学校化学学报 ›› 1994, Vol. 15 ›› Issue (1): 23.

• 论文 • 上一篇    下一篇

催化光度法测定痕量钼──钼(Ⅵ)－盐酸联氨－橙黄Ⅳ催化光度新体系

郑肇生, 吴和舟, 陈志贵, 黄天东   

  1. 福州大学化学系, 福州, 350002
  • 收稿日期:1993-02-10 修回日期:1993-06-20 出版日期:1994-01-24 发布日期:1994-01-24
  • 通讯作者: 吴和舟
  • 作者简介:郑肇生,男,56岁,副教授.
  • 基金资助:

    福建省自然科学基金

Catalytic Spectrophotometric Determination of Trace Molybdenum──A New Molybdenum(Ⅵ)-Diamine Hydrochloride Orange Ⅳ Catalytic Spectrophotometric System

ZHENG Zhao-Sheng, WU He-Zhou, CHEN Zhi-Gui, HUANG Tian-Dong   

  1. De partment of Chemistry, Fuzhou University, Fuzhou, 350002
  • Received:1993-02-10 Revised:1993-06-20 Online:1994-01-24 Published:1994-01-24

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摘要： 基于盐酸介质中,钼(Ⅵ)催化盐酸联氨还原橙黄Ⅳ的反应,建立了动力学分光光度法测定痕量钼的新方法。本法检出限为3.7×10-3μg/mL,测定钼量范围为0.025～1.8μg/mL;已将此法用于测定绿豆中的钼及钼酸铅和钼酸钡的溶度积。

关键词: 催化光度法, 橙黄Ⅳ, 钼

Abstract: A new catalytic spectrophotometric method for the determination of trace amount of Mo(Ⅵ) has been developed.The method is based on the catalytic effect of Mo(Ⅵ) on the reduction of orange Ⅳ with diamine hydrochloride. The effects of the solution PH,the reagent concentration and interfering ions on reaction rate have been studied.At.different temperatures,the linear range of determination is 0.025-1.8 μg/ mLfor molybdenum.The detection limit is 3.7×10-3 μg/mL,the relative standard deviation is 2.6%.The apparent activation energy of catalytic reaction is 46.0kJ/ mol.The method has been used to determine trace molybdenum in bean samples and the solubility product of both lead molybdate and barium molybdate.

Key words: Catalytic spectrophotometry, Orange Ⅳ, Molybdenum

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