沈抚污灌区农田土壤生态健康风险评价

doi:10.3976/j.issn.1002-4026.2017.02.014

Abstract

Abstract:

Based on the concentrations of Cd, Hg, As, Pb, Cu and Cr in the farmland soil of ShenFu sewage irrigation regions, soil ecological and health risks were evaluated with the Hakanson Potential Ecological Risk Index and the health risk assessment model recommend by the United States Environmental Protection Agency (USEPA) in this study. The results showed that the concentrations of Cd, Hg, Pb, Cu, Cr in this region were all higher than the soil background value in Liaoning Province, and showing an increasing trend year by year. Especially, Hg and Cd pollution was more serious, and the concentrations of them were over the grade Ⅱ national soil quality standard. Although the potential ecological risks of the 90% factors in soil samples were at a moderate risk level, different ways of sewage irrigation had some effects on the risk index, and the values of risk index in the area which had been sewage irrigated up to now were higher than the others. In the potential risk of single factor, the risks of Cd and Hg were more serious than other heavy metals, and it also showed that sewage irrigation would increase the heavy metal concentration in soil, and the ecological risk indexes of soil samples were 60% and 100% above the serious level respectively. In term of the evaluation of health risk, the HQ and HI values of six kinds of heavy metals in the regions were all lower than 1, which indicates that there is no noncarcinogenic risk in this area theoretically. However, the CR and TCR values of Cr、Cd and As were all higher than the standard values of the US EPA, which mean that these heavy metals would have a high carcinogenic risk.

Key words: heavy metals, health risk, assessment, sewage irrigation, ecological risk

CLC Number:

X825

WU Di, JIANG Neng-hui, WANG Yu, SUN Hui, LI Ting-ting. Risk assessment of farmland soil ecological health in Shen-Fu sewage irrigation regions[J].SHANDONG SCIENCE, 2017, 30(2): 95-105.

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Risk assessment of farmland soil ecological health in Shen-Fu sewage irrigation regions

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