Ag(Ⅰ)-5-Br-PADAP-SDS 体系的褪色分光光度法测定硫化物的研究

Spectrophotometric Determination of Sulfide by Decolour Reaction of Silver (Ⅰ)-5-Br-PADAP-SDS System

在ｐＨ５．３～６．６的ＨＡｃ－ＮａＡｃ缓冲介质中，有十二烷基硫酸钠存在，硫化物使Ａｇ（Ⅰ）－５－Ｂｒ－ＰＡＤＡＰ络合物的颜色减退。Ｓ２－在０～５μｇ／２５ｍＬ范围，吸光度减弱与Ｓ２－浓度成正比。其表现摩尔吸光系数为１．２×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。方法用于污水中硫化物的测定，结果满意。

In the presence of sodium dodecyl sulfate,colour of silver(Ⅰ)-5-Br-PADAP complex is faded by sulfide in buffer solution of NaAc-HAc (pH5 3～6 6).The decolour degree of complex is proportional to the concentration of sulfide in the range of 0～5μg/25mL with the apparent molar absorptivity of 1 2×10 5L·mol -1 ·cm -1 .The proposed method has been applied to the determination of sulfide in waste water with satisfactory results.