城郊农田土壤多环芳烃污染特征及风险评价  

Pollution Characteristics and Risk Assessment of Polycyclic Aromatic Hydrocarbons in a Suburban Farmland Soil

作　　者：张秀秀 卢晓丽 魏宇宸 朱昌达 潘剑君[1] ZHANG Xiu-xiu;LU Xiao-li;WEI Yu-chen;ZHU Chang-da;PAN Jian-jun(College of Resources and Environmental Sciences,Nanjing Agricultural University,Nanjing 210095,China)

机构地区：[1]南京农业大学资源与环境科学学院,南京210095

出　　处：《环境科学》2021年第11期5510-5518,共9页Environmental Science

基　　金：国家自然科学基金项目(41771247)。

摘　　要：为明确城郊农田土壤多环芳烃(PAHs)的污染特征,按照网格布点法在南京城郊采集29个样点,测定了15种PAHs的含量.结果表明,二氢苊(Ace)均未检出,农田土壤PAHs含量为24.49~750.04μg·kg^(-1),均值为226.64μg·kg^(-1);高环PAHs与总PAHs空间分布类似,农田土壤PAHs主要以高环PAHs为主.相关性分析结果表明,农田土壤PAHs与有机质(SOM)、pH、阳离子交换量(CEC)和全氮(TN)无显著相关性,容重(ρ_(b))与低环PAHs极显著相关.源解析结果表明,农田土壤PAHs主要来源为燃烧源和石油源的混合源.CSI指数结果表明,农田土壤PAHs不存在生态风险.健康风险评价结果表明,农田土壤PAHs对儿童和成人不存在潜在致癌风险,主要暴露途径是:皮肤接触>摄食>呼吸吸入.In order to assess the pollution of polycyclic aromatic hydrocarbons(PAHs)in a suburban farmland soil,29 sampling sites were collected around Nanjing according to the grid method,and the contents of 15 different PAHs were determined.Acenaphthene(Ace)was not detected in any of the samples.The total content of PAHs in farmland soil ranged from 24.49 to 750.04μg·kg^(-1),with an average of 226.64μg·kg^(-1).The spatial distribution of high-ring PAHs,the main PAHs in the farmland soil,was similar to that of total PAHs.There was no significant correlation between PAHs and soil organic matter(SOM),pH,cation exchange capacity(CEC),and total nitrogen(TN),whereas bulk density and low ring PAHs were significantly correlated.The results of source apportionment show that the main source of PAHs in the farmland soil is a mixture of combustion and petroleum.The contamination severity index(CSI)index shows that the PAHs does not pose an ecological risk.The results of the health risk assessment show that there is no potential carcinogenic risk to children or adults,and the main sequence of exposure is skin contact>ingestion>inhalation.

关 键 词：城郊 农田土壤 多环芳烃(PAHs) CSI指数 风险评价 

分 类 号：X53[环境科学与工程—环境工程]