摘要
在硫酸介质中．高锰酸根氧化邻苯二酚紫使其退色，退色程度在一定范围内与高锰酸根加入量成良好的线性关系。据此建立了一种测定微量锰（Ⅱ）的新方法。最大吸收波长λmax＝550nm，表观摩尔吸光系数ε＝4．2×104L·mol-1·cm－1·。锰（Ⅱ）量在0－0．8mg／L范围内符合比耳定律．方法应用于求和面粉中微量锰（Ⅱ）的测定，结果满意。
In this paper, the decolouring reaction which results from the oxidation of pyrocatecholviolet by manganese(Ⅶ)in H2SO4 medium has been studied.The decrease in colour directty pro-portional to the amount of manganese.The maximum absorption is at 550nm with an apparent mo-lar absorptivity6. 5 x 104L. mul-1. cm-1. Beer's law is obeyed from 0 to 0. 8mg/L for man-ganese. The method has deen used for the determination of manganese in some materials with sat-isfactory results.
出处
《广州化学》
CAS
1998年第3期49-52,共4页
Guangzhou Chemistry
关键词
锰
邻苯二酚紫
退色光度法
测定
水
面粉
微量分析
manganese determination,pyrocatechol violet,decolour spectrophotometry
