高等学校化学学报 ›› 1991, Vol. 12 ›› Issue (6): 751.

• 论文 • 上一篇    下一篇

新显色剂偶氮胂DBF分光光度法测定稀土元素研究

张华山, 李庆阁   

  1. 武汉大学化学系, 430072
  • 收稿日期:1990-01-18 出版日期:1991-06-24 发布日期:1991-06-24
  • 通讯作者: 张华山
  • 基金资助:

    国家自然科学基金

New Chromogenic Reagent Arsenazo DBF Used for Spectrophotometric Determination of Rare Earth Elements

Zhang Hua-shan, Li Qing-ge   

  1. Department of Chemistry, Wuhan University, Wuhan, 430072
  • Received:1990-01-18 Online:1991-06-24 Published:1991-06-24

摘要: 变色酸双偶氮胂类化合物是光度法测定稀土元素的重要显色剂,如偶氮胂Ⅲ、三溴偶氮胂等。为研究各种取代基对这类显色剂与稀土配合物的影响,将对甲基二溴偶氮胂中的甲基换为甲酰基,合成得偶氮胂DBF,化学命名为2-(2-胂酸基苯偶氮)-7-(2,6二溴-4-甲酰基苯偶氮)-1,8-二羟基萘-3,6-二磺酸。

关键词: 偶氮胂DBF, 稀土, 分光光度法

Abstract: The present paper reports the synthesis of arsenazo DBF, its characteristic, its reaction with rare earths ions and its application to the selective determination of cerium-group in aluminium-alloy. Arsenazo DBF, 2-(2-arsonophenylazo)-7-( 2, 6-dibromo-4-formylphenylazo )-1,8-dihydroxynaphthalene-3,6-disulfonic acid reacts with cerium-group rare earths to form blue-green colour complexes in NaAe-HCl aqueous solution at pH 2.2.The absorptive peak is at 630 nm. The molar absorptivity of La complexe is 1.3×105 L·mol-1·cm-1. Beer's law is obeyed over the concentration range 0~12μg/25mL of La.

Key words: Arsenazo DBF, Rare earths, Spectrophotometry

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