|
|
|
| Characteristics of nutrient and heavy metals pollution in sediments of Taihu watershed |
| YU Jia-jia1, YIN Hong-bin2, GAO Yong-nian2, TANG Wan-ying1 |
1. Nanjing University of Science & Technology, Nanjing 210094, China;
2. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China |
|
|
|
|
Abstract In this study, a total of 103-surface sediments were collected from lakes and rivers in Taihu watershed on the basis of different ecological zones. A total of 103 surface sediments were collected from lakes and rivers of Taihu watershed. The nutrients and heavy metals in sediments were analysed and the assessment of the ecological risk were carried out. The results showed that the concentration of total nitrogen descended as Ⅱ11 zone (hill zone of west lake) > Ⅱ21 zone (agricultural zone of Wuxiyu) > Ⅱ12 zone (mountain zone of Zhexi) > Ⅱ23 zone (agricultural zone of Husujia) > Ⅱ12 zone (wetland zone of Taihu Lake) with the value in the range of 550 to 3450mg/kg. The concentration of total phosphorus descended as Ⅱ23 zone > Ⅱ21 zone > Ⅱ22 zone > Ⅱ11 zone > Ⅱ12 zone with the value ranging from 320 to 2481mg/kg. The results of heavy metals in surface sediment of Taihu watershed indicated that the value of heavy metal concentrations were highest in zones of Ⅱ23 and Ⅱ21. While it was the lowest in zones of Ⅱ12, Ⅱ11 and Ⅱ22. The results of comprehensive pollution index (FF) indicated that the contamination of nutrients in sediment of Taihu watershed were very serious and a grading of pollution has been formed. The value of RI indicated that metals in Ⅱ21 zone rank the highest and then was zones of Ⅱ23,Ⅱ12 and Ⅱ22 and Ⅱ11 zone rank the lowest. The results of Igeo indicated that metals including As、Cu、Zn、Pb、Ni、Cr were not polluted while the value of Er indicated that Hg and Cd were the most polluted elements and which contribute a lot to the pollution status of metal in sediments of Taihu watershed.
|
|
Received: 01 November 2016
|
|
|
|
|
|
| [1] |
Zheng N, Wang Q, Liang Z, et al. Characterization of heavy metal concentrations in the sediments of three freshwater rivers in Huludao City, Northeast China[J]. Environmental Pollution, 2008,154(1):135-142.
|
| [2] |
甘树,卢少勇,秦普丰,等.太湖西岸湖滨带沉积物氮磷有机质分布及评价[J]. 环境科学, 2012,33(9):3064-3069.
|
| [3] |
秦延文,张雷,郑丙辉,等.太湖表层沉积物重金属赋存形态分析及污染特征[J]. 环境科学, 2012,33(12):4291-4299.
|
| [4] |
王莹,胡维平.太湖湖滨湿地沉积物营养元素分布特征及其环境意义[J]. 中国环境科学, 2015,35(1):204-210.
|
| [5] |
Gao Y, Gao J, Chen J, et al. Regionalizing aquatic ecosystems based on the river subbasin taxonomy concept and spatial clustering techniques[J]. International Journal of Environmental Research & Public Health, 2011,8(11):4367-85.
|
| [6] |
钱君龙,府灵敏.用过硫酸盐氧化法同时测定水中的总氮和总磷[J]. 环境科学, 1987,28(1):88-94.
|
| [7] |
Wang H, Wang C X, Wang Z J, et al. Fractionation of Heavy Metals in Surface Sediments of Taihu Lake, East China[J]. Environmental Geochemistry & Health, 2004,26(2/3):303-9.
|
| [8] |
王永华,钱少猛,徐南妮,等.巢Ⅱ23区底泥污染物分布特征及评价[J]. 环境科学研究, 2004,17(6):22-26.
|
| [9] |
杨洋,刘其根,胡忠军,等.太湖流域沉积物碳氮磷分布与污染评价[J]. 环境科学学报, 2014,34(12):3057-3064.
|
| [10] |
王胜强,孙津生,丁辉.海河沉积物重金属污染及潜在生态风险评价[J]. 环境工程, 2005,23(2):62-64.
|
| [11] |
徐争启,倪师军,庹先国,等.潜在生态危害指数法评价中重金属毒性系数计算[J]. 环境科学与技术, 2008,31(2):112-1.
|
| [12] |
李志宏,张云贵,任天志.太湖流域农业氮磷面源污染现状及防治对策[J]. 中国农学通报, 2008,11(24):24-29.
|
| [13] |
吴攀,秦伯强,于革,等.太湖上游流域经济发展对废水排放及入湖总磷的影响[J]. 湖泊科学, 2015,27(6):1107-1114.
|
| [14] |
Loska K, Wiechu?a D. Application of principal component analysis for the estimation of source of heavy metal contamination in surface sediments from the Rybnik Reservoir[J]. Chemosphere, 2003,51(8):723-33.
|
|
|
|
