• 关键词：多氯联苯（PCBs）  土壤污染  来源解析  人群暴露

• 基金项目：国家自然科学基金项目（No. 41701582）

• 石阳
• 兰州大学资源环境学院，甘肃省环境污染预警与控制重点实验室，兰州 730000

• 王占祥
• 兰州大学资源环境学院，甘肃省环境污染预警与控制重点实验室，兰州 730000

• 连露露
• 兰州大学资源环境学院，甘肃省环境污染预警与控制重点实验室，兰州 730000

• 李子璇
• 西安汉唐分析监测有限公司，西安 710000

• 宋世杰
• 兰州大学资源环境学院，甘肃省环境污染预警与控制重点实验室，兰州 730000

• 高宏
• 兰州大学资源环境学院，甘肃省环境污染预警与控制重点实验室，兰州 730000

• 黄韬
• 兰州大学资源环境学院，甘肃省环境污染预警与控制重点实验室，兰州 730000

• 马建民
• 北京大学城市与环境学院，北京 100871

• 毛潇萱
• 兰州大学资源环境学院，甘肃省环境污染预警与控制重点实验室，兰州 730000

• 摘要：采用气相色谱质谱联用仪检测了我国西北干旱地区皋兰县城各区域土壤中18种多氯联苯（PCBs），并利用主成分分析、多元线性回归分析以及暴露模型对研究区PCBs污染来源、人群暴露和健康风险进行了探究和评价.研究区土壤PCBs浓度为3.675~19.146 ng·g^-1，临近工业园区和城区的农田土壤平均污染程度较高，四氯联苯和五氯联苯在∑₁₈PCBs中占有较高的质量分数.PCBs污染源以含PCBs电器设备回收处置相关的IP-PCBs污染源、燃烧和工业热过程源以及与燃烧相关的污染源为主，燃烧和工业热过程源可能会对研究区PCBs污染具有更大的贡献.研究区各类人群由于PCBs暴露导致的致癌风险较低，非致癌风险也处于可接受水平，但燃烧及工业热过程作为研究区可能的主要PCBs来源，可能会对当地长期居住的人群带来不利影响，需给予重视.

• Abstract：This paper presents the first comprehensive survey of 18 polychlorinated biphenyls （PCBs） in surface soil samples collected from Gaolan county， a semi-arid region in Northwest China， in which the target PCBs were analyzed using GC-MS. The sources and pollution characteristics were identified and the health risks of local population exposure to PCBs were estimated based on principal component analysis， multiple linear regression analysis as well as human health risk model. The concentration of ∑₁₈PCBs ranged from 3.675 ng·g^-1 to 19.146 ng·g^-1， higher average concentration was observed in the soil adjacent to downtown and industrial areas， and tetra-PCBs and penta-PCBs were the most dominant congeners in all soil samples. Moreover， the result of source apportionment suggested that the abundant ∑₁₈PCBs concentrations in soil were originated from the sources of combustion and industrial thermal process， while other significant sources including PCB-containing electrical equipment and combustion process sources contributing soil PCBs concentrations were also identified in the study area. The carcinogenic risk of local residents exposure to PCBs was estimated at the lower level， and the non-carcinogenic risk for all age groups of population were much lower than the acceptable limit. Given combustion and industrial thermal processes were recognized as major PCBs sources for local soil， adverse effects on residents’ health attributable to PCBs emission should be seriously considered.

• Key words：PCBs  soil pollution  source apportionment  human exposure risk

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