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• W3202760403 endingPage "150485" @default.
• W3202760403 startingPage "150485" @default.
• W3202760403 abstract "Biodegradation is a key factor determining the properties and metal binding behaviour of dissolved organic matter (DOM). In this study, the contributions of biodegradation to DOM properties and metal binding behaviour in Dongping Lake were explored by using synchronous fluorescence (SF) spectroscopy, two-dimensional correlation spectroscopy (2D-COS) excitation-emission matrix and parallel factor analysis (EEM-PARAFAC). According to the ratio of the fluorescence intensity of different materials to the entire fluorescence intensity (%Fmax), protein-like substances were the main substances of DOM in this lake. The reduction of protein-like substances and the enhancement of humification could be found in the whole lake under the influence of biodegradation. 3 areas (Area A, Area B and Area C) were obtained by principal component analysis (PCA), however, PCA results suggested that DOM properties and sources had some differences in the 3 areas, and DOM bioavailability in Area C was stronger than that in the other 2 areas. With copper (Cu2+) and lead (Pb2+) addition, different substances exhibited various affinities to different metal types. The locations of crosspeaks in asynchronous maps illustrated that protein-like substances were more affiliative with Cu2+, while humic-like substances were bound to Pb2+ earlier. Biodegradation had a conspicuous impact the metal binding ability of DOM in Dongping Lake. The effective quenching constants (LogK) of protein-like substances (protein-like component 2: LogKCu = 3.85 ± 0.23, LogKPb = 3.32 ± 0.23) were higher than those of humic-like substances (humic-like component 3: LogKCu = 3.15 ± 0.02, LogKPb = 2.93 ± 0.17) for both Cu2+ and Pb2+ before biodegradation. When biodegradation was finished, binding ability of humic-like substances was enhanced from 3.15 ± 0.02 to 3.41 ± 0.10 for DOM-Cu and 2.93 ± 0.17 to 3.79 ± 0.15 for DOM-Pb. On a spatial scale, metal binding ability of DOM in Dongping Lake also changed due to the influence of biodegradation. For both DOM-Cu and DOM-Pb, binding ability in south of Dongping Lake was stronger than that in other areas with the end of biodegradation." @default.
• W3202760403 created "2021-10-11" @default.
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• W3202760403 date "2022-02-01" @default.
• W3202760403 modified "2023-10-01" @default.
• W3202760403 title "Investigation of the variations in dissolved organic matter properties and complexations with two typical heavy metals under the influence of biodegradation: A survey of an entire lake" @default.
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• W3202760403 doi "https://doi.org/10.1016/j.scitotenv.2021.150485" @default.
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