气质联用法测定环境空气中有机硫化物  

Determination of Organic Sulfur Compounds in Ambient Air by Gas Chromatography Equipped with Mass Spectrometry

作　　者：张凤菊[1] 金玲仁[1] 李红莉[1] 张文华[1] 朱晨[1] 

机构地区：[1]山东省环境监测中心站,山东济南250101

出　　处：《环境监测管理与技术》2014年第3期44-47,共4页The Administration and Technique of Environmental Monitoring

摘　　要：采用 SUMMA罐采集空气样品，在预浓缩系统中经3级冷阱捕集后，用气相色谱-质谱联用技术测定环境空气中7种痕量有机硫化物。对试验条件进行优化，使得甲硫醇、乙硫醇、甲硫醚、二硫化碳、噻吩、乙硫醚和二甲二硫醚等7种有机硫化物在21．47μg/m3～336．43μg/m3范围内线性良好。试验表明，7种有机硫化物的方法检出限为0．004μg/m3～0．036μg/m3；标准气体平行测定6次结果的 RSD为2．7％～6．2％，加标回收率为92．2％～97．5％。用该方法测定实际空气样品，并与傅立叶红外光谱法测定的结果进行比对，结果令人满意。Air sample was collected by SUMMA canisters and trapped through three stage cold traps in the pre-concentration system.Gas chromatography equipped with mass spectrometry （GC/MS）made it possible to do qualitative and quantitative analysis for seven kinds of organic sulfur compounds.Experimental conditions were optimized,the calibration curves showed a good linearity from 21.47 μg/m3 to 336.43 μg/m3 for methyl mercap-tan （CH3SH）,ethyl mercaptan （CH3CH2SH）,methyl sulfide [（CH3）2S],carbon disulfide （CS2）,thiophene （C4H4S）,1,1′-thiobis-ethane（C4H10S）and dimethyl disulfide [（CH3）2S2].Furthermore,experimental results indicated that method detection limits ranged between 0.004 μg/m3 and 0.036 μg/m3 and relative standard de-viation （n=6）of the seven kinds of organic sulfur compounds ranged from 2.7% to 6.2%.Spiked recoveries were between 92.2% and 97.5%.In addition,the study method was successfully applied on monitoring actual air samples.Finally,the experimental results were compared with the fourier transform infrared spectroscopy,satisfac-tory results were obtained.

关 键 词：有机硫化物 冷阱预浓缩 气相色谱质谱联用法 环境空气 

分 类 号：O657.63[理学—分析化学]