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 

机构地区：[1]Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China [2]Center for Excellence in Urban Atmospheric Environment,Institute of Regional Environment,Chinese Academy of Sciences,Xiamen 361021,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]Clear Science&Technology Co.,Ltd,Beijing 100029,China

出　　处：《Journal of Environmental Sciences》2022年第3期132-140,共9页环境科学学报（英文版）

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

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.

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

分 类 号：X831[环境科学与工程—环境工程]