一、概述关于硫化氢的测定已报导过许多方法。但要满足简便、快速、现场检测等要求,电化学方法较为合适。对此有一些专利和报告。本文叙述的方法是将被测气体通过具有良好导电性和透气性的多孔气体扩散电极组成的电化池,使被测气中的硫化氢在银催化电极上发生阳极反应而氧在铂催化电极上发生还原反应。由于环境气中氧的含量基本为一恒定值,故阴极电位可视为恒定,阳极电位则随硫化氢含量而变化。因此,通过电池电动势 I. Overview There are many methods reported for the determination of hydrogen sulfide. But to meet the simple, fast, on-site testing requirements, electrochemical method is more appropriate. There are some patents and reports on this. This article describes the method is to test the gas through a porous gas diffusion electrode with good conductivity and permeability of the composition of the electrochemical cell so that the measured hydrogen sulfide in the anode catalytic reaction of silver and oxygen in the platinum catalyst electrode A reduction reaction takes place. As the oxygen content in the atmosphere is basically a constant value, so the cathode potential can be considered constant, the anode potential changes with hydrogen sulfide content. Therefore, by the battery electromotive force