摘要
利用１，１０－邻菲啉为活化剂，锰（Ⅱ）催化高碘酸钾氧化溴甲酚绿（Ｂ．Ｇ）褪色的指示反应，研究并建立了新的痕量锰的催化动力学光度分析法测定，方法具有一定的选择性，表观摩尔吸光系数可达６．４×１０６Ｌ·ｍｏｌ－１·ｃｍ－１，催化体系较非催化体系的总包反应表观活化能下降了１０１．５ｋＪ／ｍｏｌ，测量的线性范围在０～２００ｎｇＭｎ／２５ｍｌ。本法可直接用于茶叶、菠萝、桃叶等样品中痕量锰的测定，结果令人满意。
A new indication reaction based on oxidation of bromocresol green withpotassium periodate catalyzed by Manganese(Ⅱ)is developed.The sensitivityof the new method presented as apparent molor absorptivity equals 6.4 ×106L·mol-1·cm-1 and the linear range is from O to 200 ng Mn/25 ml.The methodhas been applied for determination of Manganese in tea, pineapple and peachleaves etc.The results are satisfactory.
关键词
溴甲酚绿
催化光度法
Manganese
Bromocresol green
Catalytic photometric method
