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本文研究了镉与５－Ｂｒ－ＰＡＮ－Ｓ的显色条件。在ｐＨ９．５的缓冲液中，形成１∶２型的稳定配合物，配合物的最大吸收峰位于５４８ｎｍ波长处，表观摩尔吸光系数ε＝３．３×１０４Ｌ·ｍｏｌ－１·ｃｍ－１。镉量ρ（Ｃｄ２＋）／（ｍｇ·Ｌ－１）在０～１．６范围内符合比尔定律。采用巯基棉分离水中离子富集镉，提高了方法的选择性。本法用于水样分析，结果令人满意
In this paper, the color conditions of cadmium and 5-Br-PAN-S were studied. In the buffer solution of pH9.5, a stable complex of 1: 2 type was formed. The maximum absorption peak of the complex was located at 548nm wavelength. The apparent molar absorptivity ε = 3.3 × 104L · mol-1 · cm-1 . The amount of Cd (Cd2 +) / (mg · L-1) complies with Beer’s law in the range of 0-1.6. The use of mercapto cotton to separate cadmium from water and improve the selectivity of the method. This method is used for water sample analysis, the results are satisfactory