| 不同土地利用类型土壤多环芳烃的纵向污染特征及来源解析 |
| 摘要点击 2746 全文点击 934 投稿时间：2022-04-07 修订日期：2022-06-13 |
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| 中文关键词 城郊 土地利用类型 多环芳烃 (PAHs) 纵向污染 源解析 |
| 英文关键词 suburban land use types polycyclic aromatic hydrocarbons (PAHs) vertical pollution source analysis |
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| 中文摘要 |
| 为研究城郊地区不同土地利用类型土壤多环芳烃（PAHs）的纵向污染特征，对南京市郊菜地、林地、居民点、城镇用地、水田和工业区这6个不同土地利用类型土壤各1剖面（0~100 cm）的15种优控PAHs进行研究，分析了PAHs的纵向分布和组成特征、影响因素和来源.结果表明，6个采样点剖面Σ15PAHs含量分别为：菜地69.3~299.2 μg ·kg-1、林地20.8~128.3 μg ·kg-1、居民点30.7~142.1 μg ·kg-1、城镇用地185.6~1728.7 μg ·kg-1、水田208.3~693.0 μg ·kg-1和工业区165.6~739.2 μg ·kg-1.居民点和林地没有污染，菜地污染水平较轻，水田和工业区污染水平中等，城镇用地污染较严重.除居民点和城镇用地以外的采样点土壤PAHs集中分布在表层或次表层，但在深层仍有检出，且各采样点各深度大多以高环PAHs为主.PAHs的分子特性及成分含量、土壤的理化性质和土地利用方式均会影响PAHs在土壤中的纵向分布与迁移.PMF源解析表明人类活动产生的焦炭源、交通源和煤炭燃烧源是该研究区PAHs的主要来源. |
| 英文摘要 |
| In order to study the vertical pollution characteristics of polycyclic aromatic hydrocarbons (PAHs) in soils of different land use types in suburban areas of Nanjing, 15 types of controlled PAHs were studied in each section (0-100 cm) of soils from six different land use types, including a vegetable field, forestland, residential area, urban land, paddy field, and industrial area. The vertical distribution and composition characteristics, influencing factors, and sources of PAHs were analyzed. The results showed that:the total concentrations of Σ15PAHs in the six sampling site profiles were as follows:vegetable field (69.3-299.2 μg·kg-1), forestland (20.8-128.3 μg·kg-1), residential area (30.7-142.1 μg·kg-1), urban land (185.6-1728.7 μg·kg-1), paddy field (208.3-693.0 μg·kg-1), and industrial area (165.6-739.2 μg·kg-1). There was no pollution in the residential area or forestland and a light pollution level in the vegetable field, medium pollution level in the paddy field and industrial area, and more serious pollution in the urban land. Soil PAHs were mainly distributed in the surface or subsurface layer, except in the residential area and urban land; however, they were still detected in the deep layers, and high-molecular-weight PAHs were dominant in most depths and sampling sites. The vertical distribution and migration of PAHs in soils were affected by molecular characteristics and component concentrations of PAHs, soil physical and chemical properties, and land use types. PMF source analysis indicated that coke sources, traffic sources, and coal combustion sources from human activities were the main sources of PAHs in this study region. |
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