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气相色谱-质谱法测定环境空气中7种挥发性脂肪酸
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作者单位
高博,郭海萍,赵伟,于晓巍,耿卓,沈浩,王丽,刘明,陈来国,尹文华,余乐洹,胡国成 1.生态环境部华南环境科学研究所国家环境保护城市生态环境模拟与保护重点实验室2.广东第二师范学院生物与食品工程学院3.新疆大学化学化工学院 
基金项目:国家自然科学基金项目(41773127);广州市科技计划项目(201707010378);中央级公益性科研院所基本科研业务专项(PM-zx703-201903-037)
中文摘要:挥发性脂肪酸(VFAs)是典型的恶臭物质,其在环境空气中处于痕量水平。该文建立了同时测定环境空气中乙酸、丙酸、异丁酸、正丁酸、丙烯酸、异戊酸和正戊酸7种挥发性脂肪酸(VFAs)的气相色谱-质谱(GC-MS)分析方法。环境空气样品采用浸渍硅胶管采集,以超纯水提取,经甲基叔丁基醚萃取并浓缩定容后,GC-MS测定,内标法定量。结果显示,7种VFAs在各自的浓度范围内线性关系良好(r2≥0.995),检出限为0.11~4.78 μg/m3,加标回收率为62.3%~110%,相对标准偏差为2.2%~12%。该方法简便、准确、灵敏,适用于环境空气中VFAs的测定。
中文关键词:环境空气  挥发性脂肪酸  气相色谱-质谱法(GC-MS)  恶臭
 
Determination of Seven Volatile Fatty Acids in Ambient Air by Gas Chromatography-Mass Spectrometry
Abstract:Volatile fatty acids(VFAs) are typical malodorous substances,which are at trace levels in the ambient air.A method of gas chromatography-mass spectrometry(GC-MS) was established for the simultaneous determination of seven VFAs ie.acetic acid,propanoic acid,isobutyric acid,butyric acid,acrylic acid,isovaleric acid and valeric acid in ambient air.Ambient air samples were firstly collected with impregnated silica gel tube,then ultrasonically extracted with ultrapure water,finally partitioned with methyl tert-butyl ether,concentrated and set to a certain volume.The target compounds were determined by GC-MS,and quantified by internal standard method.Results showed that the calibration curves for seven VFAs were linear(r2≥0.995) in their respective concentration ranges with the detection limits of 0.11-4.78 μg/m3.The recoveries were in the range of 62.3%-110% with relative standard deviations of 2.2%-12%.The method is simple,accurate and sensitive,and is suitable for the determination of VFAs in ambient air.
Key Words:ambient air  volatile fatty acids  gas chromatography-mass spectrometry(GC-MS)  odor
引用本文:高博,郭海萍,赵伟,于晓巍,耿卓,沈浩,王丽,刘明,陈来国,尹文华,余乐洹,胡国成.气相色谱-质谱法测定环境空气中7种挥发性脂肪酸[J].分析测试学报,2019,(9):1108-1113.
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