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- Title
Spatial Distribution, Ecological Risk Assessment and Source Identification for Nutrients and Heavy Metals in Surface Sediments from Tangxun Lake, Wuhan, Central China.
- Authors
Shaolin Zhao; Ye Li; Dongbin Liu; Bo Li; Huafeng Xiao; Wei Cheng; Ang Li; Joel Chong
- 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.
- Subjects
RISK -- Law &; legislation; SEDIMENTS; PHYSICAL geography; ECOLOGICAL risk assessment; ENVIRONMENTAL impact analysis
- Publication
Nature Environment & Pollution Technology, 2016, Vol 15, Issue 4, p1417
- ISSN
0972-6268
- Publication type
Article