中文摘要：

饮食摄入是多环芳烃（PAHs）人体暴露的主要途径之一,探究PAHs污染对农产品安全和人体健康的影响具有重要意义。山西晋中拥有大型焦化企业,也是北方重要的大田蔬菜种植基地,当地PAHs污染的特征和影响具有相当的典型性。研究选取修文工业基地周边的大田蔬菜基地作为研究区域,分别采集大气（含气相和颗粒相）、菜地表土和卷心菜菜心样品,确定各类样品中母体PAHs的浓度水平、组成比例和分布特征。结果表明,蔬菜基地周边大气中母体PAHs的平均浓度为301 ng·m-3。大气母体PAHs主要存在于气相,低环（2～3环）组分占据优势。利用同分异构体特征比值和主成分分析对大气PAHs进行初步源解析,炼焦、燃煤和生物质燃烧、以及交通尾气排放是当地PAHs的主要排放源。菜地表土母体PAHs的中位数浓度为236ng·g-1,范围为130～703 ng·g-1,以中、高环（4～6环）组分为主,菜地表土母体PAHs浓度与土壤总有机碳（TOC）分数呈现显著正相关关系。当地大田种植卷心菜菜心的PAHs中位数浓度为12.9 ng·g-1,范围为0.9～47.6 ng·g-1,低环组分所占比例最大,其组分谱分布与大气相似。偏相关分析显示周边大气PAHs对卷心菜菜心PAHs的传输贡献要大于表土PAHs。

英文摘要：

Dietary intake is one of the main pathways for human＇s exposure to PAHs, therefore it is significant to investigate the impacts of PAHs pollution on safety of agricultural products and on human health. There were several large coking manufactures in Jinzhong County in Shanxi Province and some important planting fields for various veg-etables in Northern China. Thus, the characteristics and influences of local PAH pollution was fairly representative.The samples of ambient air（including gaseous and particulate phases）, topsoil and cabbage core（edible part） from eight vegetable plots near the local Xiuwen coking base were collected during the corresponding period. The concentrations, compositions and distribution of parent PAHs in different samples were determined. The results indicated that the median concentration of atmospheric parent PAHs close to the vegetable plots studied was up to 301 ng·m-3.Most of air parent PAHs occurred in gaseous phase, dominated by low molecular weight species with 2 ～ 3 rings.The specific ratios of paired isomeric species and principal component analysis were conducted to preliminarily identify the emitted sources of local parent PAHs. The major emission origins of the local PAHs could be apportioned as a mixture of coking, coal/biomass combustion and traffic tail gas. The median concentration of parent PAHs in topsoil from the vegetable plots was 236 ng·g^（-1）, ranged from 130 ng·g^（-1）to 703 ng·g^（-1）. The PAH components with 4 ～6 rings were dominant, and the PAHs concentrations in topsoil had a significantly positive correlation with soil TOC fractions. The median concentration of parent PAHs in the edible part of cabbages was 12.9 ng·g^（-1）, with the range from 0.9 ng·g^（-1）to 47.6 ng·g^（-1）. The PAHs profiles in cabbages were similar to those in the local air with prevailing low molecular weight species. The results of partial correlation analysis showed that the contribution of air PAHs transferred into the cabbages may be greater tha