吉林省松原油田井场周边农田土壤重金属含量特征及生态风险评价

Heavy Metals Content Characteristics and Ecological Risk Assessment of Surrounding Soil of Production Wells in Songyuan Oilfield of Jilin Province

以吉林省松原油田采油井周边农田土壤重金属Pb、Hg和As为研究对象,研究土壤中Pb、As、Hg的含量特征、潜在生态风险及其影响因素。结果表明:重金属Pb、Hg、As平均含量分别为6.392 8、0.0791和23.305 1 mg/kg,为土壤背景值的0.33、2.20和2.39倍,Hg和As在土壤中累积较明显。Hg含量有4%处于中度污染,16%为中度—重污染状态,Pb和As基本处于无污染状态。潜在生态风险由高到低为Hg、As、Pb,Hg有20%处于很强—极强生态风险级别。土壤重金属含量受到pH、OM含量的明显影响。

Heavy metals of Pb,Hg and As in farmland soil surrounding the production wells of Songyuan oilfield in Jilin Province were taken as the research object,the content characteristics,potential ecological risk and its influencing factors of Pb,As,Hg in soil were studied. The results showed that the average contents of heavy metal Pb,Hg,As were 6. 392 8,0. 0791,and 23. 305 1 mg/kg,respectively,which were 0. 33,2. 20 and2. 39 times of their background values in soil,indicating that Hg and As were accumulated apparently in soil. 4% of Hg was in the moderate pollution status,16% was in the medium-heavy pollution status,but Pb and As were almost in a state of non-pollution status. The potential ecological risk of heavy metals in the sequence of decending was Hg,As,Pb,and 20% of Hg was in the strong-very strong ecological risk levels. Soil heavy metal contents were affected by pH,OM content obviously.