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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
Study on Color Reaction System of Lead with Meso-tetrakis(4-Sulfonatophenyl)Porphyrin(TPPS4)and Its Application in Some Food Analysis
【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。
【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.;
- 【文献出处】 食品科学 ,Food Science , 编辑部邮箱 ,2006年08期
- 【分类号】TS207.51
- 【被引频次】8
- 【下载频次】246