食品科学 ›› 2006, Vol. 27 ›› Issue (8): 217-220.

• 分析检测 • 上一篇    下一篇

铅与meso-四(4-磺酸苯基)卟啉的显色系统研究及其在食品中铅的检测应用

 杨会琴,  张红兵,  戴翠萍,  韩士田,  杨京周   

  1. 河北师范大学化学学院; 河北经贸大学生物科学与工程学院;
  • 出版日期:2006-08-15 发布日期:2011-10-14

Study on Color Reaction System of Lead with Meso-tetrakis(4-Sulfonatophenyl)Porphyrin(TPPS4)and Its Application in Some Food Analysis

YANG  Hui-Qin,   Zhang-Hong-Bing,   Dai-Cui-Ping,   Han-Shi-Tian,   Yang-Jing-Zhou   

  1. 1.College of Chemistry,Hebei Normal University,Shijiazhuang 050061,China;2.College of Biology Science and Engineering,Hebei Economy and Trade University,Shijiazhuang 050061,China.
  • Online:2006-08-15 Published:2011-10-14

摘要: 本文采用吸光光度法,研究并优化了了铅与水溶性络合剂meso-四(4-磺酸苯基)卟啉(TPPS4)的显色条件,实验表明,在碱性条件(pH12)下,用邻二氮菲、硫氰酸铵、酒石酸钾钠作联合掩蔽剂,盐酸羟胺作辅助络合剂,铅与TPPS4需12min即可生成淡紫色络合物,该络合物的吸收峰为465nm,络合比为1:1。当铅含量在0~0.2μg/ml范围内时,萃取曲线符合比尔定律,用APDC/MIBK体系萃取样品中的铅离子,与TPPS4络合后比色测定几种食品中的铅,结果可行。

关键词:  , 铅, 卟啉, 分光光度法

Abstract:  The color reaction of lead with meso-tetrakis(4-sulfophenyl)porphyrin(TPPS4)was studied in this paper by using spectrophotometric method.The results indicated that in the presence of hydroxylamine hydrochloride,with ortho-dinitrogenous ptenanthrene,NH4SCN and seignette saltat as masking agents,TPPS4 and lead is light purple in an alkaline solution of pH12 at room temperature.A stable l:1(M:L)complex is formed.The Soret band of the complex is at 465nm,and Beer’s law is obeyed in the range of 0~0.2μg of lead per ml.This method has been used to determine lead in some food with satisfactory results.

Key words: lead, meso-tetrakis(4-sulfophenyl)porphyrin(TPPS4), spectrophotometric method.