潮白河密云段水体溶解性有机碳和重金属时空变化特征

doi:10.19741/j.issn.1673-4831.2019.0953

Abstract

Abstract: Elucidating dynamics of dissolved organic carbon (DOC) and heavy metals in drinking water sources provides critical implications for water source protection and drinking water treatments. In order to characterize tempo-spatial variations of DOC and heavy metals in Miyun section of Chaobai River which is a main drinking water source in Beijing, DOC and five heavy metals (Cu, Fe, Mn, Ni and Zn) as well as three water quality indicators [pH, total dissolved solids (TDS) and conductivity] in different seasons (spring, summer and autumn) and in different regions (R1: woodland region, R2: woodland and farmland mixed region, R3: urban region, and R4: farmland region) were investigated. The TDS and conductivity presented significant spatial heterogeneity among regions which were greatest in R4 (P<0.05), while seasonal variations of them in each region were subtle. The average DOC concentration was 30.60 mg·L^-1, with remarkable fluctuations across regions (P<0.05) and slight changes across seasons. The lowest DOC concentrations were found in R1 in all seasons. The average concentrations of Cu, Fe, Mn, Ni and Zn were 1.07, 9.29, 3.30, 1.64 and 2.91 μg·L^-1, respectively. Cu and Zn concentrations were greatest in spring, whilst Fe and Mn concentrations were greatest in summer and autumn. Significantly greater concentrations of five heavy metals were observed in R3 and R4 compared to the other regions. The spatial characteristics of DOC and heavy metal concentrations corresponded with the land use types adjacent to the stream. The water quality at stream sections in urban and agricultural regions was to a higher extent affected than in the regions with other land use types.

Key words: drinking water source, dissolved organic carbon, heavy metal, tempo-spatial characteristics

CLC Number:

X522

XU Xin-yao, PU Xiao, LIU Xun-liang, ZHANG Rui-ning, ZHANG Yu-hu, GAO Jing, DONG Xue, WANG Zi-kang. Tempo-spatial Variations of Dissolved Organic Carbon and Heavy Metals in Miyun Section of Chaobai River[J]. Journal of Ecology and Rural Environment, 2020, 36(9): 1177-1184.

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Tempo-spatial Variations of Dissolved Organic Carbon and Heavy Metals in Miyun Section of Chaobai River

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