摘要
本文研究了新水溶性卟啉试剂５，１０，１５，２０－四（３－溴－４－磺酸苯基）卟啉［Ｔ（３－ＢｒＰ）ＰＳ＿４与铜的显色反应。在ｐＨ３，铜与５，１０，１５，２０－四（３－溴－４－磺酸苯基）卟啉形成１：１的稳定配合物。此配合物的最大吸收波长位于４１２．８ｎｍ，摩尔吸光系数为２．６１×１０￣５Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１）。铜量在０～３．０μｇ／２５ｍＬ范围内符合比尔定律，工作曲线回归方程为ｙ＝０．００９４３、＋０．１６７ｘ，相关系数为ｒ＝０．９９９７。方法有较高的灵敏度和较好的选择性，直接用于大米和茶叶中痕量铜的测定，结果与ＡＡＳ法一致。
new water-soluble reagent 5, 10,15,20-tetra( 3-bromo-4-sulphophenyl)porphine[T(3-BrP)PS_4] for the spectrophotometric deter-mination of trace amounts of copper(Ⅱ)hasbeen studied. The maximum absorption wave-lengths of T(3-BrP)PS_4 and its complex withcopper(Ⅱ)are 435.2nm and 412. 8nm respec-tively af pH 3.0. The composition of the com-plex is 1:1.The apparent molar absorptivityis 2.61×10￣5L·mol￣(-1)·cm￣(-1).Beer's law isobeyed in the range of 0～3. 0μg/25mL forcopper. The proposed method is highly sensi-tive and selective and has been difectly appliedto the determination of copper in rice, The re-sults obtained agree well with those by AAS.
出处
《分析试验室》
CAS
CSCD
北大核心
1996年第3期32-34,共3页
Chinese Journal of Analysis Laboratory
基金
浙江省自然科学基金
关键词
铜
磺酸苯基
卟啉
光度法
茶叶
米
tatra ( 3-bromo-4-sulphophenyl)porphine
spectrophotometricmethod
trace copper determination.
