根据大庆市城市功能区划,以表层土壤为研究对象,通过308个样品的采集、测定、分析,采用Hakanson潜在生态风险危害指数法评价土壤重金属元素的潜在生态危害程度。结果表明,表层土壤重金属污染程度较低,潜在生态危害风险较小,汞(Hg)和镉(Cd)是主要的潜在生态危害元素。汞的生态危害风险相对较大,有11.9%的样品处于较重及以上风险级别,镉的生态危害级别虽然较低,但中等危害级别分布范围较广。分别用致癌风险和非致癌风险模型进行了土壤重金属镉和汞对人体健康的风险评价,两种元素的风险指数均处于安全值范围内,不会对当地居民的健康构成风险。
Based on urban function zone divisions, 308 surface samples were collected from the urban soils of Daqing City, Heilongjiang Province, China, and determined in laboratory. The potential ecological hazard of heavy metals in the surface soils were assessed by using Hakanson’s potential risk index. The results show that the degrees of heavy metals pollution were lower in the surface soils of the study area, with lower potential ecological risk. As for the main hazard elements, Hg has higher ecological risk, of which 11.9% samples are above the heavy risk level; Cd has lower ecological risk, however, samples with middle risk level are widely distributed. In addition, the assessment results of human health risk show that the cancer and non-cancer hazard indexes of Cd and Hg are both below the threshold values, indicating that the effects of Cd and Hg pollution on human health are light in the urban area of Daqing City.
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