高等学校化学学报

高等学校化学学报 ›› 1989, Vol. 10 ›› Issue (2): 140.

• 研究论文 • 上一篇    下一篇

Zn(Ⅱ)-TPPS4-CTAB显色反应及三波长吸光光度法测定痕量锌的研究

潘祖亭, 徐勉懿, 刘晓秀   

  1. 武汉大学化学系
  • 收稿日期:1987-08-11 出版日期:1989-02-24 发布日期:1989-02-24
  • 通讯作者: 潘祖亭

Studies of the Color System of Zn(Ⅱ)-TPPS4-CTAB and the Determination of Trace Zinc with Triwave-length Spectrophotometry

Pan Zuting, Xu Mianyi, Liu Xiaoxiu   

  1. Department of Chemistry, Wuhan University, Wuhan
  • Received:1987-08-11 Online:1989-02-24 Published:1989-02-24

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摘要： 本文报道以TPPS4为显色剂、Hg(Ⅱ)为催化剂、CTAB为辅助配合剂,Zn(Ⅱ)在室温下极易形成Zn(Ⅱ)-TPPS4-CTAB三元配合物。以三峰三波长胶束吸光光度法测定痕量锌,具有极高的灵敏度,ε=8.5×105L·mol-1·cm-1。应用本法测定了部分人发、水样、矿石、铝合金等试样中的痕量锌,获得了满意的结果。

关键词: 锌, 四(4-磺基苯)卟啉, 三波长, 吸光光度法

Abstract: Zinc(Ⅱ) reacts quickly with tetrakis- (4-sulphophenyl) porphyrin (TPPS4) and cethyltrimethylammonium bromide (CTAB) in the presence of mercury(Ⅱ) at room temperature. The complexes Zn(n)-TPPS4-CTAB, Hg(Ⅱ)-TPPS4-GTAB and the reagent show maximum absorption wavelengths at 427 nm, 447 nm and 417 nm, respectively. Anew method for the determination of trace zinc with triwavelength spectrophotometry is described and the molar absorptivity is 8.5 ×105L·mol-1cm-1. After the ion-exchange separation, this method is of high selectivity and has been successfully applied to the determination of zinc in aluminium alloys, ores, natural water and human hair.

Key words: Zinc, Tetrakis-(4-sulphophenyl) porphyrin, Triwavelength, Spectro- photometry

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