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| Potential ecological risk assessment of heavy metals in sediment with uncertain background impact in a shallow lake |
| WANG Wen-cai1, TANG Chun-yan1,2, ZHANG Heng-jun1, WANG Zhong1, ZENG Fan-tang1, FAN Zhong-ya1,2 |
1. Research Center of Water Environment, South China Institute of Environmental Science, Ministry of Ecology and Environment, Guangzhou 510655, China;
2. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China |
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Abstract The vertical distribution and source of heavy metals in sediment were analyzed based on measured data in this study. Additionally, the potential ecological risk and pollution level of lake sediment were assessed by the Latin Hypercube Sampling method with empirical distribution of background value based on monitoring data. Results showed that the content of heavy metals and comprehensive potential ecological risk level gradually decreased with sediment depth, which indicated that the upper layer of sediment was accompanied by high risk. Uncertainty assessment method can obtain the envelope of comprehensive potential heavy metal ecological risk level in sediment vertically. Reliability of ecological risk beyond the threshold or confidence interval of potential ecological risk index with specific confidence could be given by uncertainty analysis. The comprehensive heavy metal potential ecological risk indexes with 90% confidence were in the range of 340.08~412.89 and 271.61~327.67 in the upper layers of two sampling cores, respectively. Decision-makers with different risk preferences can take restoration, sediment dredging, or other technologies based on the results, which was near the threshold of severe potential comprehensive ecological risk. This study aims to be useful for lake management and help decision-makers comprehensively assess soil and sediments risk.
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Received: 25 February 2019
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