Assessment of heavy metal pollution in wetland soils from the young and old reclaimed regions in the Pearl River Estuary, South China |
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Authors: | Bai Junhong Xiao Rong Cui Baoshan Zhang Kejiang Wang Qinggai Liu Xinhui Gao Haifeng Huang Laibin |
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Institution: | a State Key Laboratory of Water Environment Stimulation, School of Environment, Beijing Normal University, Beijing 100875, PR Chinab Department of Civil Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4c Appraisal Center for Environment and Engineering, Ministry of Environmental Protection, Beijing 100012, PR China |
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Abstract: | Soils were sampled in three types of wetlands from the young (A) and old (B) reclaimed regions of the Pearl River Estuary. They were analyzed for total concentrations of heavy metals to investigate their distributions and pollution levels in both regions. Results showed that most heavy metals in ditch and riparian wetlands did not significantly differ from those in reclaimed wetlands in A region, while significantly lower for Cd, Cu, Pb, and Zn in reclaimed wetlands in B region, suggesting higher effects of long-term reclamation. Iron, Cr and Cu were identified as metal pollutants of primary concern and had higher contributions to the total toxic units compared to other metals. Almost all metals exceeded their lowest effect levels and Fe and Cr even exceeded the severe effect levels. Multivariate analysis shows that Fe and Mn are controlled by parent rocks and other metals mainly originate from anthropogenic source. |
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Keywords: | Heavy metal Assessment Sediment quality guidelines Toxic units Multivariate analysis |
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