| 南京城郊不同土地利用类型农业土壤多环芳烃污染特征及风险评价 |
| 摘要点击 1294 全文点击 510 投稿时间：2022-03-14 修订日期：2022-05-13 |
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| 中文关键词 城郊 不同土地利用类型 农业土壤 多环芳烃(PAHs) 蒙特卡洛模拟 风险评价 |
| 英文关键词 suburban different land use types agricultural soil polycyclic aromatic hydrocarbons(PAHs) Monte Carlo Simulation risk assessment |
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| 中文摘要 |
| 以南京市城郊不同土地利用类型的农业土壤（水田、菜地和林地）为研究对象，测定了16种PAHs的含量.结果表明，苊烯（Acy）在所有土壤样本中均未被检出，南京城郊农业土壤15种ω（PAHs）的范围在24.49~925.54 μg ·kg-1之间，平均值为259.88 μg ·kg-1.PAHs含量由高到低依次为：林地>水田>菜地，总体上以高环PAHs （HMW）含量为主.不同土壤理化性质对PAHs的影响表明：土壤有机碳（TOC）和黏粒（clay）含量与PAHs存在一定的相关性，pH和全氮（TN）与PAHs无明显相关性.毒性当量法和CSI指数法表明，南京城郊农业土壤中PAHs生态风险较小，但是林地中应当给予一定的重视.增量终身癌症风险（ILCR）进行健康风险评价表明，儿童健康的威胁风险略大于成人，林地的总的致癌风险（CR）明显高于菜地和水田，仍处于可接受的范围内.对成人进行了蒙特卡洛模拟表明，确定性健康风险的风险分析低估了PAHs的健康风险.敏感性分析结果表明，对CR总方差影响最大的输入参数是暴露频率EF （占50.7%）. |
| 英文摘要 |
| In order to clarify the pollution characteristics of PAHs in suburban agricultural soils, the content of 16 types of PAHs was measured in agricultural soils with different land use types (paddy fields, vegetable fields, and forest land) in the suburbs of Nanjing. The results showed that acenaphthene (Acy) was not detected in any soil samples. The concentration of 15 PAHs in agricultural soil in suburban Nanjing ranged from 24.49 to 925.54 μg·kg-1, with an average concentration of 259.88 μg·kg-1. In different land use types, the order of PAHs concentration in soil from high to low was:forest land>paddy fields>vegetable fields, and the high-ring PAHs content was dominant in general. The effects of different soil physicochemical properties on PAHs showed that there was a certain correlation between soil organic carbon (TOC) and clay (clay) content and PAHs, whereas pH and total nitrogen (TN) had no significant correlation with PAHs. The toxic equivalence method and CSI index method were used for ecological risk assessment, which showed that the ecological risk of PAHs in agricultural soils in suburban Nanjing was relatively small; however, the ecological risk of PAHs in forest land should be given some attention, and supervision should be strengthened. Health risk assessment using incremental lifetime cancer risk (ILCR) showed that the threat to the health of children was slightly greater than that of adults, and the CR of forest land was significantly higher than that of vegetable and paddy fields, though still within an acceptable range. Uncertain health assessments were performed in adults, showing that risk analyses of deterministic health risks underestimated the health risks of PAHs. The results of sensitivity analysis showed that the input parameter that had the greatest impact on the total variance of the total carcinogenic risk CR was the exposure frequency EF (50.7%), followed by the pollutant concentration CS (43.3%). |
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