Evaluation of offline sampling for atmospheric C3-C11 non-methane hydrocarbons

作     者：Zhiguo Liu Chengtang Liu Zhouming He Yujing Mu Chenglong Zhang Yuanyuan Zhang Pengfei Liu Yuzheng Wang Junfeng Liu Zhiguo Liu;Chengtang Liu;Zhouming He;Yujing Mu;Chenglong Zhang;Yuanyuan Zhang;Pengfei Liu;Yuzheng Wang;Junfeng Liu

作者机构：Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Center for Excellence in Urban Atmospheric EnvironmentInstitute of Regional EnvironmentChinese Academy of SciencesXiamen 361021China University of Chinese Academy of SciencesBeijing 100049China Clear Science&Technology Co.LtdBeijing 100029China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2022年第34卷第3期

页      面：132-140页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 07[理学] 070602[理学-大气物理学与大气环境] 0706[理学-大气科学] 

基　　金：This work was supported by the National Natural Science Foundation of China(Nos.21976190 21707151 22076202 41727805 41975164 21876186 41931287 and 41905109). 

主　　题：Non-methane hydrocarbons(NMHCs) Gas chromatography-flame ionization detector(GC-FID) Offline sampling Adsorption tubes Ozone scrubber 

摘      要：The concentration variation of C3-C11 non-methane hydrocarbons(NMHCs)collected in several types of commercial flexible bags and adsorption tubes was systematically inves-tigated using a gas chromatography-flame ionization detector(GC-FID)system.The per-centage loss of each NMHC in the polyvinyl fluoride(PVF)bags was less than 5%during a 7-hr storage period;significant NMHCs loss was detected in aluminum foil composite film and fluorinated ethylene propylene bags.The thermal desorption efficiency of NMHCs for adsorption tubes filled Carbopack B and Carboxen1000 sorbents was greater than 95%at 300℃,and the loss of NMHCs in the adsorption tubes during 20-days storage at 4℃was less than 8%.The thermal desorption efficiency for C11 NMHCs in the adsorption tube filled with Carbograph 1 and Carbosieve SⅢabsorbents was less than 40%at 300℃,and pyrolysis of the absorbents at 330℃interfered significantly with the measurements of some alkenes.The loss of alkenes was significant when NMHCs were sampled by cryo-enrichment at-90℃in the presence of O3 for the online NMHC measurements,and negligible for enrichment us-ing adsorption tubes at 25℃.Although O_(3)scrubbers have been widely used to eliminate the influence of O_(3)on NMHC measurements,the loss of NMHCs with carbon numbers greater than 8 was more than 10%.Therefore,PVF bags and adsorption tubes filled Carbopack B and Carboxen1000 sorbents were recommended for the sampling of atmospheric NMHCs.