本文参照碘量法测定天燃气中硫化氢含量GB/T1106.1-1998的分析步骤,结合样品的实际检测情况,提出用“沉淀过滤后分解碘量法”(下面简称沉淀法),分析低温甲醇洗工段甲醇中硫化氢,并对方法的测定条件作了改进。该方法不仅消除了甲醇中还原性物质的干扰,而且通过标准溶液浓度的改进,使测定结果准确、重复性好。 In this paper, with reference to the determination of hydrogen sulfide content in natural gas GB / T1106.1-1998 analytical procedures, combined with the actual detection of the sample, proposed “using iodine precipitation after precipitation decomposition method” (hereinafter referred to as precipitation method) The hydrogen sulfide in methanol in the low-temperature methanol washing section was analyzed, and the measuring conditions of the method were improved. The method not only eliminates the interference of reducing substances in methanol, but also improves the accuracy of the determination result and repeatability through the improvement of the standard solution concentration.