河北南部变电站场地土壤中PAHs含量、来源及健康风险

对河北省南部地区28座典型变电站场地土壤中16种优先控制的PAHs含量进行了检测和分析.结果表明，变电站场地土壤中PAHs总量为223.48~1681.17μg/kg，平均值为443.94mg/kg.变电站整体PAHs处于轻微污染水平.利用特征组分比值法和正定矩阵因子分解模型（PMF）分析了污染源类型及贡献率，结果表明，变电站土壤中PAHs主要是石油及其衍生产物污染源，其中生物质和煤炭燃烧等化石燃料燃烧占42.1%，石油及其衍生产物污染源（变压器油、柴油和汽油等混合源）占57.9%.健康风险评价结果表明变电站土壤中PAHs致癌风险较高，非致癌风险相对较低，被测变电站中有潜在致癌风险站点占比为11%，经口摄入和皮肤接触是致癌风险的主要暴露途径，变电站场地内PAHs的生态风险整体处于较低水平.

Distribution,source and risk assessment of PAHs in soil of typical substation sites in south Hebei

The concentrations of 16 priority PAHs in soil of 28 typical substation in the south of Hebei province were detected and analyzed. The total concentrations of PAHs in soil of substation ranged from 223.48 to 1681.17μg/kg, with a mean of 443.94μg/kg. The substation was at a slight pollution level for PAHs. The pollution sources and contribution rates have been analyzed using ratio method and Positive Matrix Factorization (PMF). PAHs was mainly sourced from the oil and its derivatives. The biomass and fossil fuels combustion source contribution rate was 42.1%, and the oil and its derivatives combustion source contribution rate was 57.9%. The results of health risk assessment showed that the carcinogenic risk of PAHs in the substation soil was higher than that of non-cancer. The potential carcinogenic risk sites in the substation under test accounted for 11%, and the main exposure ways of carcinogenic risk were calculated to be oral intake and skin contact. In conclusion, the ecological risk of PAHs in the substation site was at a low level.