预浓缩-气相色谱-质谱/电子捕获检测器测定环境空气中的卤代温室气体  

Determination of Halogenated Greenhouse Gases in Ambient Air by Preconcentration/Gas Chromatography-Mass Spectrometry with Electron Capture Detector

作　　者：贺辉 黄忠辉 黄钟坤 谢丹平 刘旺 HE Hui;HUANG Zhong-hui;HUANG Zhong-kun;XIE Dan-ping;LIU Wang(Guangdong Key Laboratory of Water and Air Pollution Control,South China Institute of Environmental Sciences,Ministry of Ecology and Environment,Guangzhou 510665,China)

机构地区：[1]生态环境部华南环境科学研究所、广东省水与大气污染防治重点实验室,广东广州510665

出　　处：《分析测试学报》2023年第4期432-438,共7页Journal of Instrumental Analysis

基　　金：广东省基础与应用基础研究基金项目(2021A1515110387);广州市科技计划项目(202102020315);中央级公益性科研院所基本科研业务专项(PM-zx703-202201-001)。

摘　　要：卤代温室气体(HGHGs)全球增温趋势极高,具有很强的温室效应,但其在环境空气中的浓度极低,因此准确测定环境空气中HGHGs是一项极具挑战性的工作。该文基于预浓缩-气相色谱-质谱/电子捕获检测器(GC-MS/ECD)建立了适用于环境空气中32种HGHGs的检测方法。分别考察了捕集流量、冷阱温度和电子捕获检测器温度对目标组分响应的影响,得到最优分析条件。采用优化后的条件对32种HGHGs进行方法验证,结果表明,32种HGHGs在20~800 pmol/mol范围内线性良好,相关系数(r)均大于0.99。方法检出限为0.21~1.17 pmol/mol,定量下限为0.84~4.68 pmol/mol,加标回收率为92.5%~104%,相对标准偏差(RSD)为0.50%~6.4%。该方法能够满足环境空气中HGHGs的监测需求,为大气中HGHGs的履约监测提供了一种可靠的技术手段。Halogenated greenhouse gases(HGHGs)have a strong greenhouse effect due to their high global warming potential.However,the mixing ratios of ambient HGHGs are very low,and it is a challenge to accurately determine HGHGs in ambient air.A preconcentration gas chromatographymass spectrometry with electron capture detector system(GC-MS/ECD)was established for the de⁃termination of 32 HGHGs in ambient air in this paper.The influences of capture flow,cold trap tem⁃perature and ECD temperature were investigated to obtain the optimal analysis conditions.Method validation experiments were carried out through the determination of 32 HGHGs.The results showed that good linear relationships in the range of 20-800 pmol/mol were obtained,and the correlation coefficients(r)for the 32 HGHGs were greater than 0.99.The method detection limits ranged from 0.21 pmol/mol to 1.17 pmol/mol,and the quantitation limits ranged from 0.84 pmol/mol to 4.68 pmol/mol.The spiked recoveries ranged from 92.5%to 104%,with relative standard deviations(RSDs)of 0.50%-6.4%.This method could satisfy the requirements for monitoring the HGHGs in ambient air,and it provides a reliable means for the analysis of HGHGs in ambient air.

关 键 词：卤代温室气体 预浓缩 气相色谱-质谱联用法 气相色谱-电子捕获检测法 环境空气 

分 类 号：O657.7[理学—分析化学] X132[理学—化学]