【摘要】 研究了Ｍｎ（Ⅶ）对中性红的退色作用，并借此分光光度法测定Ｍｎ。实验表明，在Ｈ２ＳＯ４介质中，中性红被Ｍｎ（Ⅶ）氧化而退色，且退色的程度随Ｍｎ（Ⅶ）存在量呈线性关系。有色溶液的最大吸收波长为５３０ｎｍ，表观摩尔吸光系数为１．４×１０４Ｌ·ｍｏｌ－１·ｃｍ－１，Ｍｎ（Ⅶ）量在０～２μｇ／ｍＬ范围内服从比尔定律。方法简单、快速、准确，选择性好，在用于测定地质样品中痕量锰时，结果满意更多还原

【Abstract】 In this paper,the decolouration resulting from the oxidation of neutral red by manganese (Ⅶ) in 0 07￣0 18 mol/L H 2SO 4 has been studied The decrease in colour is directly proportional to the amount of manganese The maximum absorption is at 530 nm and the apparent molar absorptivity is 1 4×10 4L·mol -1 ·cm -1 Beer′s law is obeyed from 0 to 2 μg/mL of manganese(Ⅶ) This method was satisfactorily used for the determination of trace manganese in geological samples更多还原