二安替比林间甲氧基苯基甲烷光度法测定钢样中的锰

Spectrophotometric Determination of Manganese in Steel with Diantipyryl-(m-methoxy)-Phenylmethane

在碱性介质中，空气氧化Ｍｎ（Ⅱ）为Ｍｎ（Ⅳ），然后在磷酸介质中，Ｆｅ３＋存在下，Ｍｎ（Ⅳ）和二安替比林间甲氧基苯基甲烷（ＤＡｍＭＭ）反应生成橙色产物，λｍａｘ＝４８０ｎｍ，ε＝２５６×１０４Ｌ·ｍｏＬ－１·Ｃｍ－１。锰的含量在０～５０μｇ／２５ｍＬ内符合比尔定律，方法用于钢样中锰的测定，结果满意。

In the alkaline medium, Mn(Ⅱ) is oxidized to Mn(Ⅳ) by air.In the presence of Fe 3+ ,diantipyryl-(m-methoxy)-phenylmethane react with Mn(Ⅳ) and form an orange product in phosphoric acid medium.The molar absorbtivity is 2 56×10 4 L·mol -1 ·cm -1 at 480nm and in accordance with Beer's law in the range of 0-50 mg/25ml. This method can be applied to the determination of Mn in steel with satisfactory results.