某地农田土壤及其潜在污染源中多环芳烃检测与评价

Determination and Assessment of Polycyclic Aromatic Hydrocarbons in Farmland Soil and Their Potential Pollution Sources

通过对A、B两地农田土壤及其潜在污染源燃煤尘、交通尘和尾气尘等样品中多环芳烃(PAHs)的检测,结果表明,A、B两地土壤样品中∑PAHs范围分别为290 ng/g～2. 53× 10~3ng/g和564 ng/g～5. 50× 10~3ng/g,污染程度为中等—严重,且呈现出由工业园区周边土壤到化工企业周边土壤至油田周边土壤逐渐加重的趋势。A、B两地不同固体样品中∑PAHs由高到低分别为尾气尘>交通尘>燃煤尘>土壤和尾气尘>交通尘>土壤>燃煤尘。源解析表明,研究区土壤中PAHs受混合源(石油源和燃烧源)污染。燃烧源既有石油及其精炼产品的燃烧,又有木材、煤燃烧。

16 polycyclic aromatic hydrocarbons （PAHs） in farmland soil and their potential pollution sources such as coal combustion dust, traffic dust and vehicle exhaust fume from A, B two sites were investigated. The results showed that the ∑PAHs in the farmland soil samples from A,B two sites were in the range of 290 ng/g～2.53×10^3 ng/g and 564 ng/g～5.50×10^3 ng/g, respectively, indicating the pollution was from moderate to serious. The pollution level in the surrounding soil trended to increase gradually from industry park, chemical enterprise to oil deposit. The concentration of ∑PAHs from A,B two sites arranged in the order of exhaust fume〉traffic dust〉coal combustion dust〉soil, and vehicle exhaust fume〉traffic dust〉soil〉coal combustion dust, respectively. According to sources apportionment research, these PAHs in the farmland soil were originated from petroleum and the combustion of petroleum and its refined products, wood, coal.