GEP  Vol.2 No.2 , April 2014
Evaluation on Ecological Risks of Soil Heavy Metals in a Certain Area of Sichuan by Improved Fuzzy Mathematics Method
Abstract: Taking a certain area in Sichuan Province as the object of this study, this paper adopts fuzzy mathematics method to make an evaluation on ecological risks of heavy metal in soil of this area. On calculation of factors’ weights, the traditional method of giving weight according to pollutants’ concentrations fails to consider the toxicity of heavy metals, and can’t reflect their actual ecological effect. With reference to the toxicity coefficient in potential ecological risk index evaluation, this article revises the traditional fuzzy mathematics evaluation model and puts forward a new method to calculate factors’ weight by incorporating toxicity levels in weight setting. The results of this study indicate: surface soil of this area was good in general, with 91.2% samples belonging to the first level, 7.77% samples belonging to the second level, and only 1.03% belonging to the third level. Compared with the results of the evaluation method of the reality content of soil, soil quality is better than the results of the quantitative evaluation, and is closer to the actual local conditions.
Cite this paper: Cui, D. , Zhao, Q. and Xu, W. (2014) Evaluation on Ecological Risks of Soil Heavy Metals in a Certain Area of Sichuan by Improved Fuzzy Mathematics Method. Journal of Geoscience and Environment Protection, 2, 28-35. doi: 10.4236/gep.2014.22005.

[1]   Chen, H.-M. (2002). The Behavior and the Environment Quality of Chemical Substances in Soil (p. 54). Beijing: Press of Science.

[2]   Li, Z.-P., Chen, Y.-C., Yang, X.-C. et al. (2006). Assessment of Potential Ecological Hazard of Heavy Metals in Urban Soils in Chongqing City. Journal of Southwest Agricultural University (Natural Science), 28, 227-230, 251.

[3]   Li, J.-X., Shi, Z.-M., Zheng, L. et al. (2011). Geochemical Characteristics of Heavy Metals Pollution in Sediments from Tuojiang Drainage. Earth and Environment, 38, 481-487.

[4]   Imperato, M., Adamo, P., Naimo, D. et al. (2003). Spatial Distribution of Heavy Metals in Urban Soils of Naples City (Italy). Environmental Pollution, 123, 247-256.

[5]   Xiang, Y., Miao, Q.-L., & Feng, J.-F. (2006). Pollution of Heavy Metals in the Bottom Mud of Lake Taihu and Its Assessment of Potential Ecological Risk. Journal of Nanjing Institute of Meteorology, 29, 700-705.

[6]   Shi, Z.-M., Ni, S.-J., Zhang, C.-J. et al. (2010). Fuzzy Mathematics Geochemistry Assessment on Environmental Quality Based on Index Weight Determination of Element Toxicity: A Case Study of Air Dust near Ground in Chengdu Economic Region. Resources and Environment in the Yangtze Basin, 19, 209-213.

[7]   Lars, H. (1980). An Ecological Risk Index for Aquatic Pollution Control a Sedimentological Approach. Water Reseach, 14, 975-1001.