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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

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【Author】 YANG Hui-qin1,2,ZHANG Hong-bing2,DAI Cui-ping2,HAN Shi-tian1,*,YANG Jing-zhou2(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)

【机构】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；河北经贸大学生物科学与工程学院河北石家庄050061河北经贸大学生物科学与工程学院河北石家庄050061；河北石家庄050061；

【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。更多还原

【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.更多还原