[Spatiotemporal Distribution and Pollution Risk Assessment of Heavy Metals in Sediments of Main Water Supply Reservoirs in Central Zhuhai City].

• DOI: 10.13227/j.hjkx.202204006
• Publication Date: 2023-01-08
• Authors: En-Rui Wang; Kunfeng Zhang; Sheng Chang; Mo-Li Zhang; Qing Fu
• Keywords: Dry season; Wet season

The Modaomen and Hongwan waterways are the main estuaries of Pearl River system. Affected by tides, Fenghuangshan Reservoir, Dajingshan Zhuxiandong which subject to water transfer along river line, important drinking sources in central part Zhuhai City Guangdong-Hong Kong-Macao Greater Bay Area. Eight heavy metals 15 sampling points reservoir area were monitored two seasons (August October) 2019. environmental quality surface sediments three supply reservoirs was surveyed using correlation analysis, geoaccumulation index evaluation, ecological risk assessment, traceability analysis present study. results showed that order average content eight as follows: Reservoir>Dajingshan Reservoir>Fenghuangshan Reservoir. contents Hg, Zn, Pb Reservoir; As, Mn, Ni, Cu, Reservoir exceeded background values soil Guangdong province 1.88-2.75, 1.05-2.32, 1.69-6.45 times. Except for As Cu Cr Ni other elements characteristics dry season>wet season. evaluation method indicated pollution degree of: Among them, only slightly polluted elements, a whole or moderately polluted. potential overall low, at medium level. Hg risk-contributing factor reservoirs, with contribution rates 78.8%, 64.4%, 51.0%, respectively.