Significant Decrease in Heavy Metals in Surface Sediment after Ten-Year Sustainable Development in Huaxi Reservoir Located in Guiyang, Southwestern China
Xiangyang Zhou
Kejia Zhou
Rong Liu
Shanggui Sun
Xinqiang Guo
Int. J. Environ. Res. Public Health 2021, 18(14), 7684; https://doi.org/10.3390/ijerph18147684 (registeringDOI) - trăng tròn Jul 2021
In the Karst area of southwestern China, the heavy metals in the sediment of a reservoir are determined by both human activities & the high background values. Thus, this study explores the change of heavy metals in surface sediment after ten-year sustainable development <...> Read more.

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In the Karst area of southwestern Đài Loan Trung Quốc, the heavy metals in the sediment of a reservoir are determined by both human activities & the high background values. Thus, this study explores the change of heavy metals in surface sediment after ten-year sustainable development in the upstream areas of a reservoir, Huaxi Reservoir, located in Guiyang of southwestern China, then evaluates the risk of these heavy metals khổng lồ water environment systematically và finally identifies the sources in both 2019 & 2009. The results reveal that all of the measured heavy metals decrease dramatically & their spatial distributions change from the increase-decrease pattern to decrease-increase pattern, implying different locations of main source input. The risk indices based on the total or average content và relative or reference values have decreased to lớn the lowest cấp độ. However, those indices calculated from the absolute nội dung of each metalloid still show a low or a moderate risk because of the high background value, such as As & Cr. Moreover, although only one main source of heavy metals is identified in both 2019 & 2009, the risk from human activities still cannot be neglected because agricultural production và infrastructure construction would promote the weathering of soil and then these heavy metals from the soil will be brought inlớn the reservoir with the rainfall-runoff process. The high background value of specific heavy metals, e.g., As and Cr would still exert some challenges to the water environment protections because the non-point source input of heavy metal cannot be controlled easily by promulgating a series of bans. These results provide important reference for creating the policies of water environment protection, especially in some Karst area of southwestern Đài Loan Trung Quốc that exhibits high background value of heavy metals.Full article
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Comparisons on the average content of heavy metals between 2019 measured in this study & 2009 from literature <32> following the water flow direction; (a) As; (b) Pb; (c) Zn; (d) Cd; (e) Zn; (f) Cr.

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Comparisons on the average content of heavy metals between 2019 measured in this study và 2009 from literature <32> following the water flow direction; (a) As; (b) Pb; (c) Zn; (d) Cd; (e) Zn; (f) Cr.

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Remote sensing images from Google Earth around high value sampling sites in 2019.

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Igeo of heavy metals calculated from the data in 2019 và that of 2009 from literature <32>.

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CF values of heavy metals calculated from data in 2019 and that of 2009 from literature <32>.

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Eri value of heavy metals calculated from data in 2019 và that of 2009 from literature <32>.

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Sum of the toxic units in surface sediments of Huaxi Reservoir based on the data in 2019 and that of 2009 from literature <32>.


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