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Fluorescence characteristics of particulate water-soluble Organic Compounds Emitted from coal-fired boilers
Atmospheric Environment ( IF 5 ) Pub Date : 2020-02-01 , DOI: 10.1016/j.atmosenv.2020.117297 Yanrong Yang , Juanjuan Qin , Ting Qi , Xueming Zhou , Rongzhi Chen , Jihua Tan , Kang Xiao , Dongsheng Ji , Kebin He , Xiaoting Chen
Atmospheric Environment ( IF 5 ) Pub Date : 2020-02-01 , DOI: 10.1016/j.atmosenv.2020.117297 Yanrong Yang , Juanjuan Qin , Ting Qi , Xueming Zhou , Rongzhi Chen , Jihua Tan , Kang Xiao , Dongsheng Ji , Kebin He , Xiaoting Chen
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Abstract The fluorescence characteristics of particulate water-soluble organic compounds (WSOC) emitted by different power of coal-fired boilers (A total of 14 boilers including 1, 2, 4, 6, 10, 15, 20 tons steam per hour (t·h−1)) in Lanzhou, an industrial city of northwest China, were analyzed by excitation-emission matrix (EEM) fluorescence spectroscopy. Results showed that the fluorescence profiles of WSOC in different power coal-fired boiler samples had certain similarities, reflecting the consistency of the fluorophore structures in the coal-originated WSOC. In general, the main excitation (Ex) and emission (Em) wavelength ranges of fluorescence peaks generated by WSOC were λEx = 230–250 nm and λEm = 360–430 nm. Since the fluorophore of WSOC was mainly concentrated in the fluorescent regions II and III, the main components in the fluorophore were tryptophan-like, fulvic acid and humic-like substances. Humification index (HIX), fluorescence index (FI) and freshness index (BIX) were 0.36 ± 0.36, 2.09 ± 0.42 and 1.02 ± 0.30, respectively. It may indicate that the particulate WSOC had a lower degree of humification and lower aromaticity. In the range of larger Stokes shift (λEx−1-λEm−1 ≥ 1.2 μm−1), the normalized fluorescence intensity of WSOC showed the largest peak, suggesting that there may be many hydrophobic substances containing a large number of π-conjugated systems in WSOC. These findings are not only conducive to cognize the optical characteristics of particulate matter emitted from coal-fired pollution sources, but also help to consummate the spectral characteristics of coal-fired pollution sources.
更新日期：2020-02-01
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