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| Pollution characteristics and potential ecological risks of heavy metals in topsoil of Beijing |
| XIONG Qiu-lin1, ZHAO Jia-yin2, ZHAO Wen-ji1, WANG Hao-fei1, LI Wei-wang1, YU Xue1, OU Yang1, YANG Xing-chuan1 |
1. Urban Environmental Process and Digital Modeling Laboratory, College of Resources, Environment & Tourism, Capital Normal University, Beijing 100048, China;
2. College of Environmental Sciences and Enginnering, Peking University, Beijing 100871, China |
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Abstract In order to study the pollution characteristics and potential ecological risk of heavy metals in topsoil of Beijing, topsoil samples were collected in different functional areas of Beijing during November 2013 to December 2013. And 49groups of topsoil samples with different particle sizes were obtained using settling-out method after the settlement and classification from the initial samples. Then the concentrations of 8heavy metals Cr, Ni, Cu, Zn, Mo, Cd, Ba and Pb were measured by ICP-MS. The results showed that the average concentrations of Cd, Cu, Zn and Pb were respectively 1.4mg/kg, 85mg/kg, 333mg/kg and 69mg/kg in topsoil of Beijing, and the pollution of those heavy metals in traffic areas was significantly heavier than that in other functional areas. Geo-accumulation indexes of Cd, Cu, Mo, Ni, Pb and Zn were negatively correlated with the particle size. That is to say, the smaller the particle size was, the higher the corresponding value would be, and the higher its pollution degree would be. The total potential ecological risks of heavy metals in traffic areas were much higher than those in other functional areas. And the total potential ecological risks of heavy metals in industrial zones and urban-rural fringe areas were the second highest. The smaller the particle size was, the higher the potential ecological indexes would be, and the bigger its potential ecological risk would be. In addition, the potential ecological risk of Cd accounted for the most part of the total potential ecological risks.
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Received: 17 October 2016
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