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- W3208294774 endingPage "127688" @default.
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- W3208294774 abstract "Water-soluble organic compounds (WSOC) have a significant impact on aerosol radiative forcing and climate change, and there is considerable uncertainty in predicting and mitigating their climate and environmental effects. Here, the effects of pH on the light absorption properties of WSOC in particulate matter from different typical emission sources and ambient aerosols were systematically investigated using UV-vis spectrophotometer. pH (2-10) had an important impact on the light absorption properties of WSOC. The absorption, aromaticity, and the light absorption capacity of WSOC increased significantly with increasing pH for all samples. The difference absorbance spectra (∆absorbance) showed that the change of light absorption properties with pH was related to the deprotonate of carboxyl and phenolic groups resonating with aromatic and conjugated systems, with the most likely structures being carboxylic acids and phenols. Coal combustion and summer samples exhibited much higher susceptibility of light absorption properties to pH variation (increased by 27.0% and 65.9% relative to the pH 2 level, respectively). Absorption indices of almost all samples were significantly correlated with pH, indicating that the light absorption properties of WSOC may be quantitatively related to pH. The pH-dependent light absorption properties may have profound implications for evaluating the climate impacts of aerosol WSOC such as radiative forcing." @default.
- W3208294774 created "2021-11-08" @default.
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- W3208294774 date "2022-02-01" @default.
- W3208294774 modified "2023-10-16" @default.
- W3208294774 title "Effects of pH on light absorption properties of water-soluble organic compounds in particulate matter emitted from typical emission sources" @default.
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- W3208294774 doi "https://doi.org/10.1016/j.jhazmat.2021.127688" @default.
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