四(4-氯苯基)卟啉分光光度法测定微量铅(Ⅱ)  

Spectrophotometric Determination of Lead(Ⅱ) with meso-Tetrakis(4-chlorophenyl) porphyrin as a Chromogenic Reagent

作　　者：单驰[1] 李敏智[1] 朱敏[1] 朱卫华[1] 欧忠平[1] 

机构地区：[1]江苏大学化学化工学院,江苏镇江212013

出　　处：《分析科学学报》2012年第6期815-818,共4页Journal of Analytical Science

基　　金：国家自然科学基金(No.21171076);江苏大学高级人才基金(11JDG124)

摘　　要：研究了四(4-氯苯基)卟啉与微量铅(Ⅱ)的显色反应,探讨了显色剂、硼砂-氢氧化钠,表面活性剂Tween-80等的用量以及反应时间对配合物的生成以及稳定性的影响。结果表明,在pH=10的硼砂-氢氧化钠缓冲溶液及Tween-80微乳液中,铅(Ⅱ)与四(4-氯苯基)卟啉形成1∶1的稳定配合物。配合物的最大吸收位于466nm波长处,表观摩尔吸光系数ε=2.5×105L.mol-1.cm-1,铅(Ⅱ)浓度在160μg.L-1范围内符合比耳定律。方法用于环境水样中铅的测定,获得较好的结果。meso-Tetrakis（4-chlorophenyl）porphyrin（TCIPP） was used as a novel color reagent for the determination of lead（ II ）, and the conditions for the color reaction were studied, including the reation time,the amount of color reagent, buffer solution（Na2 B4 O7-NaOH） and Tween-80. In Na2 B4 O7-NaOH buffer solution of pH= 10,a stable complex with the molar ratio[Pb（ II ）： TCIPP] of 1：1 was formed in the presence of Tween-80, with its absorption maximum at 466 nrn and an apparent molar absorptivity （ε） of 2.5 ×10^5 mol. L-1 ·cm-1. Beer＇s Law was obeyed in the range of 160 ug.L-1 for Pb（II）. The proposed method was applied to the determination of lead in environmental water samples with satisfactory results.

关 键 词：四(4-氯苯基)卟啉 分光光度法 铅(11) 环境水样 

分 类 号：O657.32[理学—分析化学]