摘要
本文研究了在ＰＨ４．８的邻苯二甲酸氢钾──氢氧化钠介质中痕量Ｍｎ（Ⅱ）对ＫＩＯ４氧化铬黑Ｔ褪色的新指示反应；其反应的活化能为６０．１８ＫＪ．ｍｏｌ－１，表现速率常数ｋ＝７．３９×１０－３ｍｉｎ－１，半衰期Ｔ１／２为９３．８ｍｍ，该反应为一级反应，由此建立了催化动力学光度法测定痕量锰的新方法。本方法的检出限量为１．４５×１０－１０ｇｍｌ－１，测定范围为０～０．１ｕｂ／２５ｍｌ。对白糖和包菜中锰的测定，结果个人满意。
A new method has been studied in this paper based on the fact that trace Mn(Ⅱ) in a solution of KHC8H4O4──NaOH(PH4.8)catalyzes the discoloring reaction of Eriochrome black T by KIO4.The apparent activation energy of the reaction is 60.18 KJ. mol-1 , the apparent rate constant is 7.39×10-3min-1 and the half life period(T1/2) is 93. 8 min. and it is a first order reaction. The detection limit is 1. 45×10-10g. ml-1 The range of measurement is 0～0. 1 ugMn(Ⅱ)/25ml,The method has been used ror determining trace Mn(Ⅱ) in sugar and cabbage with satisfactory results.
出处
《宝鸡文理学院学报（自然科学版）》
CAS
1995年第1期21-24,共4页
Journal of Baoji University of Arts and Sciences(Natural Science Edition)
关键词
催化光度法
铬黑T体系
高碘酸钾
catalytic spectrophotometic method,Manganese determination
