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| Pollution characteristics of metals and nutrients in different regions of Lake Taihu based on diffusive gradients in thin-films technique |
| Received:March 02, 2016 |
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| KeyWord:Lake Taihu;DGT;precipitated zirconia gel;P;speciation;regional pollution |
| Author Name | Affiliation | E-mail | | ZHOU Chun-yang | State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China | | | GUAN Dong-xing | State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China | | | HAN Yong-he | State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China | | | PAN Yue | State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China | | | FANG Xu | State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China | | | WANG Xing-yu | State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China | | | ZHENG Jian-lun | State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China | | | LI Ya-qing | State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | WEI Tian-jiao | State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China | | | ZOU Yi-tao | State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China | | | CUI Xin-yi | State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China | | | LUO Jun | State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China | esluojun@nju.edu.cn |
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| Abstract: |
| Concentrations of metals and nutrients in water and sediments from 7 different regions in Lake Taihu were measured using in situ diffusive gradients in thin-films(DGT) technique. Their regional pollution characteristics were evaluated. Results showed that the concentrations of metals and nutrients measured by DGT were lower than those by chemical extraction. Simultaneous measurements of multiple elements at ultra-low concentration levels were obtained using DGT. No obvious differences were found in DGT-measured concentrations of metals in water among 7 regions, while large differences were observed in DGT-measured concentrations of metals in sediments among these regions. Iron, As, Zn, Ni and W were heavily polluted in Zhushan Bay, Meiliang Bay and Lake Gong, compared to the central Lake, Lake Xu and East Lake Taihu. Overall, the order of DGT-measured concentrations of metals in sediments was Fe> Mn> Zn> Ni> As> W> Co> Mo> Cu. Unlike metals, the average P concentrations measured by DGT in water were high, with the highest value(83.2 μg·L-1) appeared in Lake Gong. As for DGT-measured P in the sediments, Zhushan Bay, Meiliang Bay and Coastal region were heavily polluted, with the highest value of 500 μg·L-1 detected. By comparing P concentrations in sediments with those in water, it was found that the sediments in Zhushan Bay, Meiliang Bay and Coastal region probably acted as P sources, which potentially released P to the overlying water. |
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