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Article

The Impacts of Precipitation on Fluorescent Dissolved Organic Matter (FDOM) in an Urban River System

1
College of Urban and Environmental Sciences, Peking University, No.5 Yiheyuan Road, Haidian District, Beijing 100871, China
2
Chemical Science College, University Bordeaux, UMR EPOC CNRS 5805, F-33400 Talence, France
3
China Academy of Building Research, No. 30 Beisanhuan East Road, Chaoyang District, Beijing 100029, China
*
Author to whom correspondence should be addressed.
Academic Editors: Giovanni Libralato and Wen-Tao Li
Water 2022, 14(15), 2323; https://doi.org/10.3390/w14152323
Received: 24 May 2022 / Revised: 22 July 2022 / Accepted: 25 July 2022 / Published: 27 July 2022
(This article belongs to the Special Issue Water Quality and Contaminant Transport in Aquatic Environments)
Precipitation is considered a key factor influencing the fluorescent dissolved organic matter (FDOM) of urban rivers. However, the multiple effects of precipitation on FDOM in urban rivers and the long-term impacts of precipitation on the spatial patterns of FDOM are seldom known. Spatiotemporal variations of FDOM at 36 sites from the urban rivers of Jinan City during dry and wet seasons were investigated in this study. Four components were identified using an excitation–emission matrix and parallel factor analysis. Overall, the total fluorescence intensities in dry and wet seasons ranged from 6.59 to 35.7 quinine sulfate units (QSU) and 3.42 to 69.3 QSU, respectively. Significant variations were found for different components that C2 and C3 declined but C4 increased in the wet season (p < 0.05). The temporal variations for different components could be explained by the different combined effects of precipitation dilution and flushing. Three different reference FDOM sources, including background water, spring water, and wastewater treatment plant (WWTP) outlets, were illustrated using principal coordinate analysis (PCoA). The places of FDOM in most sites were more closed to the PCoA location of WWTP outlets in the dry season while central shifted in the wet season. The changes of FDOM sources in the wet season could be explained by the mixed effect of precipitation. In conclusion, this study provided new insights into the multiple impacts of precipitation on FDOM in urban river systems, and also data support for precise pollution discharge and water resource management. View Full-Text
Keywords: precipitation; fluorescent dissolved organic matter (FDOM); spatiotemporal variations; principal coordinates analysis (PCoA); EEM-PARAFAC; Xiaoqing River precipitation; fluorescent dissolved organic matter (FDOM); spatiotemporal variations; principal coordinates analysis (PCoA); EEM-PARAFAC; Xiaoqing River
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MDPI and ACS Style

Yang, J.; Gao, C.; Zhang, X. The Impacts of Precipitation on Fluorescent Dissolved Organic Matter (FDOM) in an Urban River System. Water 2022, 14, 2323. https://doi.org/10.3390/w14152323

AMA Style

Yang J, Gao C, Zhang X. The Impacts of Precipitation on Fluorescent Dissolved Organic Matter (FDOM) in an Urban River System. Water. 2022; 14(15):2323. https://doi.org/10.3390/w14152323

Chicago/Turabian Style

Yang, Jiashuai, Chan Gao, and Xuantong Zhang. 2022. "The Impacts of Precipitation on Fluorescent Dissolved Organic Matter (FDOM) in an Urban River System" Water 14, no. 15: 2323. https://doi.org/10.3390/w14152323

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