Articles | Volume 24, issue 6
https://doi.org/10.5194/acp-24-3769-2024
https://doi.org/10.5194/acp-24-3769-2024
Research article
 | 
27 Mar 2024
Research article |  | 27 Mar 2024

Distribution, chemical, and molecular composition of high and low molecular weight humic-like substances in ambient aerosols

Xingjun Fan, Ao Cheng, Xufang Yu, Tao Cao, Dan Chen, Wenchao Ji, Yongbing Cai, Fande Meng, Jianzhong Song, and Ping'an Peng

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Short summary
Molecular-level characteristics of high molecular weight (HMW) and low MW (LMW) humic-like substances (HULIS) were comprehensively investigated, where HMW HULIS had larger chromophores and larger molecular size than LMW HULIS and exhibited higher aromaticity and humification. Electrospray ionization high-resolution mass spectrometry revealed more aromatic molecules in HMW HULIS. HMW HULIS had more CHON compounds, while LMW HULIS had more CHO compounds.
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