工业污水中硫化物测定的一种新分离法

A New Separation Method for Sulfide Analysis in Industrial Wastewater

硫化物分析方法通常使用部颁"环境监测分析方法"中的吹气法,在酸性条件下H2S随吹入载气(CO2或N2)的逸出而得到分离。该方法回收率虽高,但所需设备复杂,操作不方便。该文提出利用加入废水中的硫酸和Zn反应产生的H2为载体,使H2S随着H2的逸出得到分离。对模拟硫化物废水的分析表明,该分离方法的回收率为88～110,相对标准偏差为±3。对实际焦化废水中的硫化物含量进行的测定也得到了很好的结果。该文所提出的分离方法装置简单,操作方便,具有较高的准确度和精确度,可以应用推广。

Sulfide in wastewater was generally analyzed by blower procedure, where H2S in strong acidic conditions was separated by carrier gas （CO2 or N2） . This traditional procedure requires complex devices and complicated operations, though the recovery is very high. In this paper, we propose a new procedure that uses H2 generated in situ by Zn and H2SO4 as carrier gas to separate H2S. The result from simulated S^2- wastewater analysis suggests that the recovery is 88 -110 and the relative standard deviation is ±3. Satisfactory result is also obtained by measuring S^2- in coking plant wastewater. This method only requires simple devices, can be executed easily, and achieves high accuracy and precision; thus it provides promising application in the practice of sulfide analysis.