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本文研究了５－（４－二乙氨基苯偶氮）－８－羟基喹啉（ＤＥＰＡＱ）与锰（Ⅱ）的显色反应。在非离子型表面活性剂ＴｒｉｔｏｎＸ－１００存在下，ｐＨ８．５的缓冲介质中，锰（Ⅱ）与ＤＥＰＡＱ形成１：２的红色配合物，最大吸收波长为５３０ｎｍ，表观摩尔吸光系数ε＝７．３×１０４Ｌ．ｍｏｌ－１．ｃｍ－１．锰量在０～２０μｇ／２５ｍＬ范围符合比尔定律。试验了常见阴阳离子的干扰情况。本法用于茶叶中微量锰的测定，取得了令人满意的结果。
In this paper, the color reaction of 5- (4-diethylaminophenylazo) -8-hydroxyquinoline (DEPAQ) with manganese (Ⅱ) was studied. In the presence of non-ionic surfactant TritonX-100, the reddish complex of manganese (Ⅱ) with DEPAQ in the buffer medium of pH 8.5 formed a maximum absorption wavelength of 530 nm with an apparent molar absorptivity of ε = 7 .3 × 104L. mol-1. cm-1. Beer’s law is obeyed in the range of 0 ~ 20μg / 25mL. Test the common interference of anion and cation. This method is used for the determination of trace manganese in tea and has achieved satisfactory results.