二溴四苯基卟啉分光光度法测定水样中铅  

Spectrophotometric Determination of Lead in Water Samples with Dibromo-tetraphenylporphyrin as Chromogenic Reagent

作　　者：沈薇[1] 单驰[1] 张秀风[1] 朱卫华[1] 欧忠平[1] 

机构地区：[1]江苏大学化学化工学院,镇江212013

出　　处：《理化检验（化学分册）》2011年第9期1055-1057,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：江苏大学高级人才基金(05JDG051)

摘　　要：研究了显色剂二溴四苯基卟啉与铅（Ⅱ）的显色反应。在Tween-80微乳液及pH12的磷酸氢二钠-氢氧化钠缓冲溶液中，铅（Ⅱ）与显色剂形成1：1的稳定配合物。其最大吸收位于472nm波长处，表观摩尔吸光率为2．2×10^4L·mol-1·cm-1。铅（1I）的质量浓度在180μg·L-1以内符合比耳定律。方法用于环境水样中铅（Ⅱ）的测定，回收率在99．9％～102．0％之间。Dibromo-tetraphenyl-porphyrin （DBTPP） was used as a new chromogenic reagent for determination of lead（Ⅱ ）, and conditions for the colour reaction were studied. In a Na2 HPO4-NaOH buffer solution of pH 12, and in the presence of Tween-80, a stable coordination complex with the molar ratio [Pb（ Ⅱ ） ： （DBTPP）] of 1 to 1 was formed, with its absorption max. at the wavelength of 472 nm. Value of apparent molar absorptivity was found to be 2. 2×10^4L·mol-1·cm-1. Beer＇s law was held in the range within 180 μg·L-1. The proposed method was applied to the determination of lead in environmental water samples, giving values of recovery in the range of 99.9%--102.0%.

关 键 词：二溴四苯基卟啉 分光光度法 铅(Ⅱ) 环境水样 

分 类 号：O657.32[理学—分析化学]