分光光度法测定水中痕量锌  

Spectrophotometric Determination of Trace Amount of Zinc in Water

作　　者：张志华[1] 

机构地区：[1]邢台医学高等专科学校,邢台054000

出　　处：《理化检验（化学分册）》2013年第7期861-862,866,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：河北省科学技术研究与发展指导计划资助项目(12277707)

摘　　要：在pH 1.2邻苯二甲酸氢钾-盐酸缓冲溶液中,新型卟啉吡啶季铵盐显色剂-溴化5-[4-N-(对甲氧基)苄铵基吡啶基]-10,15,20-三(4-N-吡啶基)卟啉与锌(Ⅱ)形成1:1配合物。在此显色反应中,新型卟啉试剂具有显色和表面活性剂的双重功能。此配合物的最大吸收波长为424 nm,表观摩尔吸光率为4.96×10~5 L·mol^(-1)·cm^(-1),锌(Ⅱ)质量浓度在800μg·L^(-1)以内符合比耳定律。方法用于3个水样中锌(Ⅱ)的测定,方法的回收率和测定值的相对标准偏差(n=5)在96.0%~97.1%和0.43%~0.63%之间。A new chromogenic reagent, 5-[4-（p-methoxy） benzyl ammonium pyridinium]-10,15,20-tris（4-N- pyridinium） porphyrin bromide was used to react with Zn（ Ⅱ ） in potassium acid phthalate-HC1 buffer medium of pH 1.2 to form a coordination complex with molar ratio of 1 to 1. Absorption maximum of the complex lies at the wavelength of 424 nm with its molar absorptivity of 4. 96×10^5L·mol^-1·cm^-1. Linear relationship between values of absorbance and mass concentration of zinc was kept in the range within 800 μg · L^-1. In the reaction, this new reagent not only acted as a chromogenic reagent but also as a surfactant. Three water samples were analyzed by the present method, giving values of recovery and RSD＇s （n=5） in the ranges of 96.0%-97. 1 % and 0. 43%-0.63% respectively.

关 键 词：分光光度法 卟啉吡啶季铵盐 锌 

分 类 号：O657.32[理学—分析化学]