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区域环境与生态

李久海,董元华,曹志洪,王辉,杨林章,胡正义,林先贵,尹睿.慈溪市农田表层、亚表层土壤中多环芳烃(PAHs)的分布特征[J].环境科学学报,2007,27(11):1909-1914

Distribution of polycyclic aromatic hydrocarbons (PAHs) in the surface and subsurface soils in Cixi County

李久海
1. 中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室, 南京 210008; 2. 中国科学院南京土壤研究所-香港浸会大学土壤与环境联合开放实验室, 南京 210008

董元华
1. 中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室, 南京 210008; 2. 中国科学院南京土壤研究所-香港浸会大学土壤与环境联合开放实验室, 南京 210008

曹志洪
1. 中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室, 南京 210008; 2. 中国科学院南京土壤研究所-香港浸会大学土壤与环境联合开放实验室, 南京 210008

王辉
1. 中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室, 南京 210008; 2. 中国科学院南京土壤研究所-香港浸会大学土壤与环境联合开放实验室, 南京 210008

杨林章
1. 中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室, 南京 210008; 2. 中国科学院南京土壤研究所-香港浸会大学土壤与环境联合开放实验室, 南京 210008

胡正义
1. 中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室, 南京 210008; 2. 中国科学院南京土壤研究所-香港浸会大学土壤与环境联合开放实验室, 南京 210008

林先贵
1. 中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室, 南京 210008; 2. 中国科学院南京土壤研究所-香港浸会大学土壤与环境联合开放实验室, 南京 210008

尹睿
1. 中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室, 南京 210008; 2. 中国科学院南京土壤研究所-香港浸会大学土壤与环境联合开放实验室, 南京 210008

摘要：为了解多环芳烃在土壤中的迁移,研究了慈溪市农田表层土壤(耕层)和亚表层(犁底层)土壤中15种PAHs的含量及分布特征.表层土壤中PAHs的总量在70.4～325.1μg·kg^-1之间;含量较高的几种化合物为萘(Nap)、菲(Phe)、荧蒽(Fla)、芘(pyr)和(chr)等,但主要以4环以上芳烃为主;Fla/(Fla+Pyr)与IcP/(IcP+BgP)比值分析表明,表层土壤中的PAHs主要来源于草、木、煤等的燃烧和汽车尾气排放.亚表层土壤中,PAHs总量为29.5～232.3μg

Abstract：Samples of surface and subsurface layers of arable soils in Cixi County were collected and 15 polycyclic aromatic hydrocarbons (PAHs) in the samples were determined by HPLCwith a fluorescence detector. The results show that the total PAHs in the surface soils ranged from 70.4 to 325.1 μg·kg^-1, dominated by the large molecular weight PAHs with 4 or more aromatic rings. Nap, Phe, Fla, and Pyr were present at relatively high levels. The ratios of Fla/(Fla+pyr) and IcP/(IcP+BgP) indicate that the PAHs in the surface soils are probably originated from the combustion of grass, wood, and coal, and vehicle exhaust. In the subsurface soils, the total PAHs varied from 29.5 to 232.3 μg·kg^-1, with 2-ring, and 3-ring PAHs as the predominant compounds. The concentration ratios of individual PAHbetween the surface soils and the sub-surface soils are significantly correlated with the octanol-water partition coefficient (logKow), indicating that PAHs in the subsurface soils are mainly leached from the upper soils. Transport of each individual PAHin soils may be predicted according to its logKow value. PAHs contents in the subsurface soils are significantly correlated with soil organic matter contents (r=0.836, p<0.0001), but not for the surface soils. This suggests that agricultural management may influence the distribution of PAHs in the surface soils.