引用本文:王美飞,杨丽莉,胡恩宇,沈敏.直接进样-气相色谱质谱法同时测定固定污染源排气中的含氟温室气体[J].环境监控与预警,2017,9(4):17-21
WANG Mei fei, YANG Li li, HU En yu, SHEN Min.Determination of Fluorinated Green House Gases in Stationary Source by Direct Injection Gas Chromatography Mass Spectrometry[J].Environmental Monitoring and Forewarning,2017,9(4):17-21
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直接进样-气相色谱质谱法同时测定固定污染源排气中的含氟温室气体
王美飞,杨丽莉,胡恩宇,沈敏
南京市环境监测中心站,江苏 南京 210013
摘要:
建立了一种直接进样-气相色谱质谱法同时分离和测定固定污染源排气中三氟甲烷、四氟甲烷、六氟乙烷和六氟化硫等含氟温室气体的方法。使用CP-SillicaPLOT毛细管填充柱可使上述4种目标化合物实现基线分离。分别用全扫描模式和选择离子扫描模式进行定量分析,方法检出限分别为0.12,0.19,0.10 ,0.08 mg/m3和2.8,3.4,1.7,3.1 μg/m3。探讨了样品保存容器与保存时间对样品浓度衰减的影响,指出Tedlar采样袋或铝塑复合膜采样袋可以较长时间保存样品,在常温下,样品可保存至少7 d。实际样品测定结果表明方法快速、简便,适用于固定污染源排气中含氟温室气体的测定。
关键词:  含氟温室气体  气质联用法  固定污染源
DOI:
分类号:X831;O657.7+1
文献标识码:B
基金项目:江苏省环境监测科研基金资助项目(1401)
Determination of Fluorinated Green House Gases in Stationary Source by Direct Injection Gas Chromatography Mass Spectrometry
WANG Meifei, YANG Lili, HU Enyu, SHEN Min
Nanjing Environmental Monitoring Center, Nanjing, Jiangsu 210013, China
Abstract:
A method has been established for simultaneous determination of 4 kinds of fluorinated green house gases including trifluoromethane, tetrafluoromethane, hexafluoroethane and sulfur hexafluoride in stationary source gas by direct injection gas chromatography mass spectrometry. The above 4 target compounds are baseline separated on a CP SillicaPLOT packed column. Full scan mode (SCAN) and select ion scanning mode (SIM) were both used for quantitative analysis. The method detection limits of the 4 target compounds were 0.12, 0.19, 0.10, 0.08 mg/m3in SCAN mode and 2.8, 3.4, 1.7, 3.1 μg/m3in SIM mode, respectively. The impact of containers used for sample preservation and the preservation time on the attenuation of sample concentration was discussed. The results showed that the Tedlar sampling bag or the gas sampling bag made of aluminum plastic composite film are appropriate. In the above 2 kinds of sampling bag, the target compounds remain stable at least 7 days. The real sample test showed that the current method is quick and easy, also it can be applied to determine the above fluorinated green house gases in stationary source gas.
Key words:  Fluorinated green house gases  Gas chromatography mass spectrometry  Stationary source