化学
质谱法
煤
煤燃烧产物
微粒
生物量(生态学)
飞行时间质谱
环境化学
发色团
有机化学
色谱法
电离
海洋学
地质学
离子
作者
Yaoqiang Huo,Ziyu Guo,Qing Li,Di Wu,Xiang Ding,Anlin liu,Dou Dou Huang,Gaokun Qiu,Manman Wu,Zhijun Zhao,Hao Sun,Weihua Song,Xiang Li,Yingjun Chen,Tangchun Wu,Jianmin Chen
标识
DOI:10.1021/acs.est.0c08518
摘要
Identification of humic-like substances (HULIS) structures and components is still a major challenge owing to their chemical complexity. This study first employed a complementary method with the combination of two-dimensional gas chromatography–time-of-flight mass spectrometry and liquid chromatography–quadrupole-time-of-flight mass spectrometry to address low-polarity and polar components of HULIS in PM2.5 (particulate matter with an aerodynamic diameter less than 2.5 μm), respectively. The combination method showed a significant correlation in identifying overlapping species and performed well in uncovering the chemical complexity of HULIS. A total of 1246 compound species in HULIS (65.6–81.0% for each sample), approximately 1 order of magnitude more compounds than that reported in previous studies, were addressed in PM2.5 collected in real-world household biomass and coal combustion. Aromatics were the most abundant compounds (37.4–64.1% in biomass and 34.5–70.0% in coal samples) of the total mass in all HULIS samples according to carbon skeleton determination, while the major components included phenols (2.6–21.1%), ketones (6.0–17.1%), aldehydes (1.1–6.8%), esters (2.9–20.0%), amines/amides (3.2–8.5%), alcohols (3.8–17.0%), and acids (4.7–15.1%). Among the identified HULIS species, 11–36% mass in biomass and 11–41% in coal were chromophores, while another 22–35 and 23–29% mass were chromophore precursors, respectively. The combination method shows promise for uncovering HULIS fingerprinting.
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