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Spatial Distribution, Ecological Risk Assessment and Source Identification for Nutrients and Heavy Metals in Surface Sediments from Tangxun Lake, Wuhan, Central China


Affiliations
1 Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
2 Oriental Link Holdings Pty Ltd, Unit 8, 24 Parkland Road, Osborne Park, Australia
 

The nutrient and heavy metal contents of sediments in the largest urban lake in Wuhan City in China are determined through a detailed analysis of the present condition of Tangxun Lake pollution. Total nitrogen (TN) and total phosphorus (TP) contents in vertical change are experimentally analysed by using the geoaccumulation index (Igeo) and potential ecological risk index to evaluate the heavy metal pollution in Tangxun Lake. Results reveal that the nutrient content in the surface sediment of Tangxun Lake decreases as depth increases. The maximum concentrations of TN and TP in the surface layer reach 0 cm to 6 cm in depth, and different pollution levels of heavy metals are detected in the sediments. The heavy metal contents along the vertical direction are similar, and the degree of pollution exhibits the following order: Cd > As > Zn > Cu > Cr > Pb. The potential ecological harm index is evaluated, and the following ecological risk degree of heavy metals is obtained: Cd > As > Pb > Cu > Cr > Zn. Multivariate statistical analyses suggest that Pb, Cu, Cr, and Zn are mainly from natural sources, Cd and As are from anthropogenic sources, and TN and TP are from urban sewage and fisheries. This study provides significant insights into the pollution treatment of Tangxun Lake in China.

Keywords

Tangxun lake sediment, Nutrients, Heavy metals, Environmental risk.
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  • Spatial Distribution, Ecological Risk Assessment and Source Identification for Nutrients and Heavy Metals in Surface Sediments from Tangxun Lake, Wuhan, Central China

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Authors

Shaolin Zhao
Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
Ye Li
Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
Dongbin Liu
Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
Bo Li
Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
Huafeng Xiao
Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
Wei Cheng
Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
Ang Li
Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China
Joel Chong
Oriental Link Holdings Pty Ltd, Unit 8, 24 Parkland Road, Osborne Park, Australia

Abstract


The nutrient and heavy metal contents of sediments in the largest urban lake in Wuhan City in China are determined through a detailed analysis of the present condition of Tangxun Lake pollution. Total nitrogen (TN) and total phosphorus (TP) contents in vertical change are experimentally analysed by using the geoaccumulation index (Igeo) and potential ecological risk index to evaluate the heavy metal pollution in Tangxun Lake. Results reveal that the nutrient content in the surface sediment of Tangxun Lake decreases as depth increases. The maximum concentrations of TN and TP in the surface layer reach 0 cm to 6 cm in depth, and different pollution levels of heavy metals are detected in the sediments. The heavy metal contents along the vertical direction are similar, and the degree of pollution exhibits the following order: Cd > As > Zn > Cu > Cr > Pb. The potential ecological harm index is evaluated, and the following ecological risk degree of heavy metals is obtained: Cd > As > Pb > Cu > Cr > Zn. Multivariate statistical analyses suggest that Pb, Cu, Cr, and Zn are mainly from natural sources, Cd and As are from anthropogenic sources, and TN and TP are from urban sewage and fisheries. This study provides significant insights into the pollution treatment of Tangxun Lake in China.

Keywords


Tangxun lake sediment, Nutrients, Heavy metals, Environmental risk.

References