便携式气相色谱法快速测定恶臭气体样品中的硫化物

建立一种利用便携式气相色谱仪快速、简便地测定恶臭气体样品中硫化物的方法,对硫化氢、甲硫醇、甲硫醚及二硫化碳能实现良好分离,光离子化检测器PID可实现甲硫醇、甲硫醚、二硫化碳的快速定性、定量分析,还能避免高浓度二氧化硫对测定的干扰,检出限分别为0.05、0.03、0.02ppm,精密度好,相对标准偏差RSD分别小于11.6%、7.89%和2.14%,经实际应用,效果良好。

Quick Determination of Sulfides in Malodorous Gas Samples by Portable Gas Chromatography

An easy and fast determination method was established for sulfides in malodorous gas samples.In this paper,a portable gas chromatograph equipped with photo ionization detector(PID) was used.A good separation was achieved among the following compounds: Sulfureted hydrogen,methyl mercaptan,dimethyl sulfide and carbon disulfide.PID makes it possible to do qualitative and quantitative analysis for the other three compounds except for sulfureted hydrogen.High concentration of sulfur dioxide doesn’t interfere with the determination since it’s no response in PID.For those three compounds,the determination limits come to be 0.05,0.03 and 0.02 ppm respectively.And the relative standard deviations(RSD) are less than 11.6%,7.89% and 2.14% respectively.The present method is successfully applied to environmental emergency monitoring.