镍(Ⅱ)-二甲酚橙-茶皂素显色反应的研究

Study of the Chromogenic Reaction of Ni(Ⅱ) with Xylenol Orange and Tea Saponin

以茶皂素为非离子型表面活性剂，系统研究镍（Ⅱ）－二甲酚橙－茶皂素显色体系，结果表明，在非离子表面活性剂茶皂素存在下，显色反应的λｍａｘ＝５９０ｎｍ，表观摩尔吸光系数ε＝１．１×１０４ｍｏｌ－１·Ｌ·ｃｍ－１，镍浓度在０～２．０μｇ·ｍｌ－１范围内符合比耳定律。该方法用于水样中镍的测定，结果满意。

The color reaction of Ni(Ⅱ) with xylenol orange and tea saponin was studied.In the presence of tea saponin,the apparent molar absorptivity of this reaction is 1 1×10 4 at 590 nm,Beer's law is obeyed in the range of 0～2 0 μg·ml -1 .The reaction can be used to determine Ni(Ⅱ) in water sample.