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| Assessment of Heavy Metal and Nutrient Pollution in Surface Sediments from Rural River Network in Southern Jiangsu Province, China |
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| KeyWord:river network; sediment; heavy metal; nutrient; pollution assessment |
| Author Name | Affiliation | | BO Lu-ji | Institute of Soil Science，Chinese Academy of Sciences，Nanjing 210008，China；University of Chinese Academy of Sciences，Beijing 100049，China | | WANG De-jian | Institute of Soil Science，Chinese Academy of Sciences，Nanjing 210008，China | | ZHANG Gang | Institute of Soil Science，Chinese Academy of Sciences，Nanjing 210008，China | | RAN Jing | Institute of Soil Science，Chinese Academy of Sciences，Nanjing 210008，China；University of Chinese Academy of Sciences，Beijing 100049，China | | ZHENG Ji-cheng | Institute of Soil Science，Chinese Academy of Sciences，Nanjing 210008，China；University of Chinese Academy of Sciences，Beijing 100049，China |
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| Abstract: |
| River sediments could accumulate heavy metals and nutrients from and then release into water, causing water pollution. An investigation was performed to assess the pollution status and sources of heavy metals（As, Cd, Cr, Cu, Hg, Ni, Pb and Zn）, and nutrients [total nitrogen（TN）, total phosphorus（TP） and organic matter（OM）] in 34 surface sediment samples collected from rural rivers in Southern Jiangsu Province, China. The mean concentrations of As, Cd, Cr, Cu, Hg, Ni, Pb and Zn in surface sediments were 15.7, 6.11, 162, 124, 0.55, 86.3, 72.5 mg·kg-1 and 370 mg·kg-1, which were 1.6, 46.9, 2.1, 5.5, 1.9, 3.2, 2.8 times and 5.9 times higher than their background values in the soils of Jiangsu Province, respectively. TN and TP were averagely 2.54 g·kg-1 and 1.30 g·kg-1, respectively. The Index of Geoaccumulation showed that Cd was the most serious pollutant. Organic index and organic nitrogen of sediments were 0.98 and 0.24%, respectively, both falling into the level Ⅳ, implying their pollution. The discharges of domestic sewage and industrial wastewater were identified as major pollutant sources. The present results suggest that heavy metal and nutrient pollution have become an environmental issue in the studied area and immediate remediation measures should be implemented. |
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