期刊
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
卷 109, 期 5, 页码 698-705出版社
SPRINGER
DOI: 10.1007/s00128-021-03418-x
关键词
Arsenic pollution; Surface sediment; Eutrophication; Urban lakes; Risk assessment
资金
- National Natural Science Foundation of China [42007339]
- Fundamental Research Funds for the Central Universities [SWU119009]
- Natural Science Foundation of Chongqing [cstc2020jcyj-msxmX0467]
- National Key R&D Program of China [2017YFA0207204, 2018YFD0800305]
This study evaluated the spatial distribution, ecological risk, and origin of arsenic in surface sediments from a hypertrophic urban lake in China. The results showed that arsenic concentration decreased from north to south, consistent with the eutrophication status of the lake. The contamination of arsenic was primarily influenced by anthropogenic factors, and although the current risk was low, there was a potential for moderate to high ecological risk.
Urban freshwaters containing arsenic are facing an increasing problem of eutrophication. This study evaluated the spatial distribution, ecological risk, and origin of As in surface sediments obtained from Caohai Lake, a typical hypertrophic urban lake in China. It revealed that the total As concentration in surface sediments decreased gradually from north to south, consisted with the lake eutrophication status. The average As level was 161 mg/kg, dominated by reducible and oxidisable fractions. The analyses of geoaccumulation index and enrichment factor indicated that As ranged between moderately-to-heavily and heavily contamination, was severely influenced by anthropogenic factors, i.e. industrial discharges and agricultural activities. Risk assessment code and potential ecological risk index results showed moderate to high potential ecological risk could be observed although the current As risk was low, supporting by the experimentally quantified As release data.
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