高等学校化学学报 ›› 1982, Vol. 3 ›› Issue (2): 188-194.

• 论文 • 上一篇    下一篇

卟啉在分析化学中的应用(Ⅰ)——四-(4-三甲铵苯基)卟啉吸光光度法测定痕量铜

杨克让, 张传铀, 程介克   

  1. 武汉大学化学系
  • 收稿日期:1980-12-29 出版日期:1982-04-24 发布日期:1982-04-24

APPLICATION OF PORPHYRIN IN ANALYTICAL CHEMISTRY (I)——SPECTROPHOTOMETRIC DETERMINATION OF TRACE AMOUNTS OF COPPER WITH TETRAKIS-(4-TRIMETHYLAMMONIUMPHENYL) PORPHINE

Yang Kerang, Zhang Chuanyou, Cheng Jieke   

  1. Research Laboratory of Analytical Chemistry, Wuhan University, Wuhan
  • Received:1980-12-29 Online:1982-04-24 Published:1982-04-24

摘要: 本文提出以水溶性卟啉α、β、γ、δ-四-(4-三甲铵苯基)叶啉[简称T-(4-TAP)P]作显色剂并研完了T-(4-TAP)P与铜(Ⅱ)的显色反应。试验了21种金属离子及8种盐的干扰,影响均小。提出了吸光光度测定ppb级痕量铜的方法。应用于测定高纯稀土及水样中痕量铜,操作简便快速,结果满意。

Abstract: In this paper, the complex reaction of water-soluble α, β, γ, δ-tetrakis-(4-trimethylammoniumphenyl) porphine[T(4-TAP)P] with copper( I ) has been studied. The porphyrin was found to be a highly sensitive and highly selective reagent for direct spectrophotometric determination of copper at ng level. The Soret band of the complex lay at 411 nm(ε= 4.0 × 105), which is well separated from that of the reagent(431nm,ε = 4.7 × 105) below pH2. The complex formation is slow at room temperature and pH4.5, however, it can be accelerated by heating and completed within 5 min at 100℃. The sensitivity of the reagent and the complex for absorbance 0.001 were 0.13 ng Cu cm-2 and 0.16ng Cu cm-8 respectivly. 27 determinations of standard solutions containing 0.016μg ml-1 of copper gave a relative standard deviation of±1.8%. The interference of many ions and salts have been examined and found to be minimal. Large amounts of rare earth do not interfere with the determination. The simple and rapid methods established could be applied to the direct spectrophotometric determination of trace amounts of copper in high-purity rare earth samples and water samples with satisfactory result.