中文摘要：

利用湿筛法,将采自上海市不同土地利用类型下的表层土壤分成〈63、63-125、125-250、250-500和〉500μm 5种粒径组分,测定其16种美国环境保护署优控的多环芳烃（PAHs）含量。∑16PAHs浓度范围为5.2-125.6μg/g,金山石化区污染物浓度最高。不同粒级污染物浓度差别较大,最高值集中在〉125μm的粗砂粒部分,最低值出现在〈63μm粒径组分。除商业中心区外,各粒级组分中多环芳烃均以4环及以上多环芳烃为主。低环（2-3环）、中环（4环）、高环（5-6环）PAHs和∑16PAHs与土壤中总有机碳（TOC）、黑碳（BC）均呈显著性正相关（P〈0.01）。有机碳标准化PAHs浓度表明,有机质结合PAHs能力在125-250μm粒径组分最强,在〈63μm粒径组分最低。源解析表明样品土壤中PAHs主要来源于燃烧,住宅区虎丘、商业区金茂大厦地区土壤中PAHs部分可能源于石油泄漏。

英文摘要：

The concentrations of 16 polycyclic aromatic hydrocarbons （PAHs） in US EPA priority list were analyzed in five particle size fractions including 〈63,63-125,125-250,250-500, 〉 500 μm separated by wet sieve method. Soil samples were taken from different land use types in Shanghai. Total PAH concentrations ranged from 5.2 to 125.6 μg/g, with the highest concentration of pollutants in Jinshan, the largest petrochemical district in China. PAH concentrations in different size fractions vary greatly, with the highest in the coarse sand, while the lowest in 〈63p.m fractions. Excluding of the business district, the composition of PAHs in five size fractions showed similar patterns dominated by PAHs with four or more tings. A positive correlation between PAHs and TOC/BC content was found for lower ring （2-3 rings）, middle ring （4 rings）, high ring （5-6 rings） PAHs and E16PAHs （P〈0.01） respectively. When normalized by TOC, the highest PAH concentrations occurred in the 125-250 μm fractions, while 〈63 μm fractions showed relatively low PAH concentrations. The source apportionment indicated that PAHs in soils were mainly from combustion, and PAHs in soils taken from Huqiu, Jingmao could be partly from oil spill.