A Device and Rapid Method Without Pretreatment for Determination of Hydrogen Sulfide in Aqueous Samples

建立了免预处理测定水样中硫化氢浓度的快速简便方法.该法利用硫化氢的可气化、可透过气液分离膜的特征使之与复杂基底分离,基于亚甲基蓝比色法原理进行测定.自制PVC采样装置,内装显色剂(对氨基二甲基苯胺与硫酸高铁铵的混合液),以聚四氟乙烯气液分离膜封口;将该装置投入水样中,水中的硫化氢透过分离膜扩散进入装置并与显色剂反应;20 min后用分光光度计测定吸光值.利用标准曲线即可计算水中硫化氢的浓度,亦可通过目视比色法半定量快速检出,测定范围为0.05～10 mg(S2-)/L.本法简单、方便、低成本,省却了繁琐的预处理操作步骤,基底干扰小,可直接测定浑浊水样.本法有望发展成现场及原位的测定方法,用于低浓度硫化氢的定性和半定量快速分析.A rapid and simple method without pretreatment for the determination of hydrogen sulfide in water sample has been developed.It was based on the principle of methylene blue spectrophotometric method.The absorbing/color developing reagent was filled in a self-made PVC device sealed with PTFE membrane.Hydrogen sulfide permeated through PTFE membrane and reacted with the reagent for 20 min.Then the hydrogen sulfide concentration the range of 0.05~10 mg(S2-)/L could be quantified with a calibration curve by a spectrophotometer.The semi-quantitation could also be observed by naked eyes.The proposed method was simple,convenient,and low cost.Without tiresome pretreatment,it was time and labor saving.The complicate matrix would not interfere with the detection,and the direct detection of hydrogen sulfide in water on field or in-situ could be possible.厦门大学“挑战杯”和“凌峰计划”项目资