摘要
在碱性介质中，加热时空气氧化Ｍｎ（Ⅱ）为Ｍｎ（Ⅳ），Ｍｎ（Ⅳ）与二安替比林（３，４－二甲氧基）苯基甲烷反应生成橙色产物，吐温２０和乳酸起到协同增敏作用，λｍａｘ＝４６０ｎｍ，ε＝７．８×１０４Ｌ·ｍｏｌ－１·ｃｍ－１，锰量在０～１２μｇ／２５ｍＬ范围内符合比尔定律。柠檬酸可以消除Ｃｒ（Ⅲ）、Ｃｏ２＋、Ｃｕ２＋的干扰。用于测定茶叶中的Ｍｎ（Ⅱ），操作简便、快速、结果较好。
The reaction conditions of diantipyl (3,4 dimethoxy) phenylmethane(DADMM) with Mn(Ⅳ) were studied.In alkaline medium,Mn(Ⅱ) is oxidized to Mn(Ⅳ) by oxygen and then in H 3PO 4 medium,DADMM reacts with Mn(Ⅳ) to form an orange product,having an absorption maximum at 460nm with a molar absorptivity of 7.8×10 4 L·mol -1 ·cm -1 .Lactic acid and Tween 20 show synergic sensitizing effect on the reaction.Beer's law is obeyed for 0～12μg/25mL Mn(Ⅱ).The method has been used in the determination of manganese in green tea.
出处
《分析试验室》
CAS
CSCD
1997年第1期33-35,共3页
Chinese Journal of Analysis Laboratory
关键词
DADMM
锰
分光光度法
茶叶
Diantipyl (3,4 dimethoxy) phenylmethane
manganese
green tea
spectrophotometry
