摘要
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。
The condition of colour reaction of cadmium with 5 Br PAN S has been studied.Cadmium with 5 Br PAN S forms a 1∶2 stable complex within pH 9.5 buffering solution.The maximum absorbance of the complex is at 548 nm and its apparent molar absorptivity is 3.3×10 4 L·mol -1 ·cm -1 .The amounds of cadmium is in the range of 0-16 μg/ml,which is conformed to the Beer′s law.The common metal ions can be separated,and enriched cadmium by sulfhydryl cotton fiber.Thus,it will greatly be improving the selectivity with a sensitivity of the system.The method has been used to determine the cadmium in water samples and results are satifactory.
出处
《矿物岩石》
CAS
CSCD
北大核心
1997年第2期98-101,共4页
Mineralogy and Petrology
