土壤重金属污染潜在生态风险指数评价方法改进和案例验证
Improvement and case verification of potential ecological risk index assessment method for soil heavy metal contamination
-
摘要:
潜在生态风险指数(PERI)已广泛用于评价土壤重金属污染潜在生态风险，但以往采用了针对淡水湖泊沉积物的重金属毒性效应因子。本研究基于上地壳、土壤、淡水、维管植物、人体中的元素丰度，参照瑞典学者Håkanson的方法，估算和建议了针对土壤重金属污染生态风险评价的毒性效应因子。As、Cd、Co、Cr、Cu、Hg、Ni、Pb、Sb、Zn的毒性效应因子分别为15、30、12、10、6、40、7、7、15、1。提出了上述10种重金属土壤污染潜在生态风险评价分级体系：PERI < 160、160≤PERI < 320、320≤PERI < 640、640≤PERI分别代表低、中、高、非常高潜在生态风险。案例验证表明，该毒性效应因子和潜在生态风险评价分级体系适合土壤重金属污染潜在生态风险评价。
Abstract:Potential ecological risk index has been widely used to assess the potential ecological risk of soil heavy metal contamination.However, previous studies usually used the toxic-response factors which were suggested by Håkanson to assess the potential ecological risk of fresh lake sediments.According to Håkanson principle, this study estimated and suggested the toxic-response factors of heavy metals for the potential ecological risk assessment of soil contamination, based on the abundance of these heavy metals in upper crust, soils, fresh water, vascular plants, and human.Estimated toxic-response factor of As, Cd, Co, Cr, Cu, Hg, Ni, Pb, Sb, and Zn was 15, 30, 12, 10, 6, 40, 7, 7, 15, and 1, respectively.In addition, risk categories of soils contaminated by the 10 heavy metals were suggested: PERI < 160, 160≤PERI < 320, 320≤PERI < 640, and 640≤PERI represented low, moderate, high, and very high potential ecological risks, respectively.Case verification indicated these toxic-response factors and risk categories were suitable to the potential ecological risk assessment of soil heavy metal contamination.
下载: