|
| Vertical distribution and migration of heavy metals in sediment cores of Taihu Lake |
| Received:September 28, 2015 |
| View Full Text View/Add Comment Download reader |
| KeyWord:Taihu Lake;sediment cores;heavy metals;vertical distribution;migration |
| Author Name | Affiliation | E-mail | | YANG Chen | Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China
College of Environment, Hohai University, Nanjing 210098, China | | | WANG Pei-fang | Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China
College of Environment, Hohai University, Nanjing 210098, China | pfwang2005@hhu.edu.cn | | LIU Jia-jia | Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China
College of Environment, Hohai University, Nanjing 210098, China | | | WANG Chao | Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China
College of Environment, Hohai University, Nanjing 210098, China | | | HOU Jun | Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China
College of Environment, Hohai University, Nanjing 210098, China | | | QIAN Jin | Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China
College of Environment, Hohai University, Nanjing 210098, China | |
|
| Hits: 3318 |
| Download times: 3093 |
| Abstract: |
| Studying the distribution of heavy metals in sediment profiles is of great significance for understanding the pollution history and migration of heavy metals in lake sediments. Here we collected sediment cores from Taihu Lake, and determined total content and fractions of Cd, Pb, Cu, and Cr. The total content of Cd, Pb, Cu, and Cr decreased with increasing depth, with the turning points appeared in 1950 and 1980, especially in 1980. Meiliang bay, Zhushan bay and Gonghu bay suffered from very severe pollution, followed by the central area. The residual fraction of the metals was dominant. The average values of residual Cd, Pb, Cu, and Cr accounted for 59.74%, 81.67%, 77.81% and 59.74% of their total, respectively. The exchangeable Cd and Cu fractions were respectively 15.81% and 13.62%, while the proportion of iron and manganese oxides bound Pb was 11.36%. Migration rates of heavy metals in the upper sediments were higher, whereas the heavy metals in bottom sediments were relatively stable and poorly mobile. Calculation of the form migration of heavy metals showed that exchangeable metals were higher in the surface sediments as they were adsorbed on fine particulate matter, settled directly in the surface sediments and moved downward along with the sediment movements. At deeper sediments where iron and manganese oxides and AVS(Acid Volatile Sulfide) accumulated, the exchangeable metals were transferred into iron and manganese oxides bound, organic matter and sulphide bound fractions. |
|
|
|
