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- W2800282887 abstract "Excitation-emission matrix (EEM) spectra were used to analyze the fluorescence properties of water-soluble organic compounds (WSOC) in PM2.5 during winter and summer seasons in Lanzhou city, northwest China. Protein-like substances, humic-like substances and microbial by-products were found to be the main fluorophoric organic matter. Humification index (HIX), biological index (BIX) and fluorescence index (FI) were 1.2 ± 0.1, 1.4 ± 0.1 and 1.7 ± 0.2 in winter and 2.0 ± 0.3, 1.3 ± 0.1 and 1.2 ± 0.4 in summer, respectively, indicating higher aromaticity of WSOC in summer and terrestrial biogenic sources of WSOC in both seasons. Strong correlations were found between regional average fluorescence intensities (RAFI) at the fluorescence regions of II-V and water-soluble inorganic ions (K+, Cl−, NO3− and SO42−) in winter with the Spearman correlation coefficients ρ being larger than 0.7 and mostly around 0.9, suggesting significant contributions of bioaerosols, coal combustion and vehicle exhaust to PM2.5. Moderate correlations were found between RAFI and K+, Cl−, and NO3− in summer, indicating the more important roles of biogenic and vehicle exhaust than coal combustion sources in summer. High temperature in winter was conducive to and in summer prohibitive to polycondensation of WSOC, indicating the existence of an optimum temperature for such a process to occur. High relative humidity was unfavorable to the formation of fluorescent WSOC." @default.
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- W2800282887 date "2018-07-01" @default.
- W2800282887 modified "2023-10-16" @default.
- W2800282887 title "Fluorescence fingerprinting properties for exploring water-soluble organic compounds in PM2.5 in an industrial city of northwest China" @default.
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- W2800282887 doi "https://doi.org/10.1016/j.atmosenv.2018.04.049" @default.
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