Articles | Volume 24, issue 13
https://doi.org/10.5194/acp-24-7575-2024
https://doi.org/10.5194/acp-24-7575-2024
Measurement report
 | 
04 Jul 2024
Measurement report |  | 04 Jul 2024

Measurement report: Effects of transition metal ions on the optical properties of humic-like substances (HULIS) reveal a structural preference – a case study of PM2.5 in Beijing, China

Juanjuan Qin, Leiming Zhang, Yuanyuan Qin, Shaoxuan Shi, Jingnan Li, Zhao Shu, Yuwei Gao, Ting Qi, Jihua Tan, and Xinming Wang

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Cited articles

Baduel, C., Monge, M. E., Voisin, D., Jaffrezo, J. L., George, C., Haddad, I. E., Marchand, N., and D'Anna, B.: Oxidation of atmospheric humic like substances by ozone: A kinetic and structural analysis approach, Environ. Sci. Technol., 45, 5238–5244, https://doi.org/10.1021/es200587z, 2011. 
Chen, Q., Ikemori, F., Higo, H., Asakawa, D., and Mochida, M.: Chemical structural characteristics of hulis and other fractionated organic matter in urban aerosols: Results from mass spectral and FT-IR analysis, Environ. Sci. Technol., 50, 1721–1730, https://doi.org/10.1021/acs.est.5b05277, 2016. 
Chen, Q. C., Miyazaki, Y., Kawamura, K., Matsumoto, K., Coburn, S., Volkamer, R., Iwamoto, Y., Kagami, S., Deng, Y. G., Ogawa, S., Ramasamy, S., Kato, S., Ida, A., Kajii, Y., and Mochida, M.: Characterization of chromophoric water-soluble organic matter in urban, forest, and marine aerosols by HR-ToF-AMS analysis and excitation emission matrix spectroscopy, Environ. Sci. Technol., 50, 10351–10360, https://doi.org/10.1021/acs.est.6b01643, 2016. 
Chen, W., Habibul, N., Liu, X. Y., Sheng, G. P., and Yu, H. Q.: FT-IR and synchronous fluorescence heterospectral two-dimensional correlation analyses on the binding characteristics of copper onto dissolved organic matter, Environ. Sci. Technol., 49, 2052–2058, https://doi.org/10.1021/es5049495, 2015. 
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The present research unveiled that acidity dominates while transition metal ions harmonize with the light absorption properties of humic-like substances (HULIS). Cu2+ has quenching effects on HULIS by complexation, hydrogen substitution, or electrostatic adsorption, with aromatic structures of HULIS. Such effects are less pronounced if from Mn2+, Ni2+, Zn2+, and Cu2+. Oxidized HULIS might contain electron-donating groups, whereas N-containing compounds might contain electron-withdrawing groups.
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