氧化偶氮胂M褪色光度法测定微量锰的研究

Spectrophotometric Determination of Manganese by Decolouring Arsenazo M

在酸性介质中，Ｍｎ（Ⅶ）强的氧化性对偶氮胂Ｍ有褪色作用，借此进行吸光光度法测定微量锰的研究。实验表明，在１８～２７ｍｏｌ／ＬＨ２ＳＯ４介质中，有色溶液的最大吸收波长为５４０ｎｍ，表观摩尔吸光系数为１８３×１０４Ｌ／ｍｏｌ·ｃｍ，锰量在０～１４μｇ／ｍｌ范围内与有色溶液吸光度的减少值呈线性关系。方法简单快速、选择性好、准确度高，灵敏度是高锰酸盐法的近８倍，可用于测定水样、地质样品中的微量锰。在测定某些地质样品中的微量锰时，结果满意。

In this paper,the decolouring reaction which results from the oxidation of Arsenazo M by manganese()in 1827mol/L H2SO4 has been studied.The decrease in colour is directly proportional to the amount of manganese.The maximum absorption is at 540nm.Beer 's law is obeyed from 0 to 14 g/ml of manganese.The method was satisfactory in determining the trace manganese in geological mineral samples.