| 深圳市表层土壤多环芳烃污染及空间分异研究 |
| 摘要点击 2837 全文点击 1448 投稿时间：2013-06-18 修订日期：2013-08-14 |
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| 中文关键词 表层土壤 PAHs 城市化 生态风险 深圳市 |
| 英文关键词 surface soils PAHs urbanization ecological risk Shenzhen |
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| 中文摘要 |
| 以深圳为研究区域，选择土壤为研究对象，以多环芳烃（polycyclic aromatic hydrocarbons，PAHs）为目标物，采集表层土壤样品188个，调查样品中PAHs的赋存状态，以此为基础，分析土壤PAHs污染水平与城市化进程的关系，并初步评估深圳土壤中PAHs的生态风险. 结果表明，表层土壤中的28种PAHs（∑28PAHs）、16种美国环保署优控PAHs（∑16PAHs）和7种致癌PAHs（∑7CarPAHs）的含量范围分别为5~7939 ng·g-1、2~6745 ng·g-1和未检出~3786 ng·g-1. 8种土地利用类型中∑16PAHs平均含量由高到低依次为：交通用地、商业用地、工业用地、农业用地、居住用地、城市绿地、果园和林地. 来源分析表明，化石燃料的燃烧是建设用地和非建设用地样品∑16PAHs的主要来源，贡献率分别为75.1%和68.2%. 研究还发现高分子量PAHs浓度和城市化水平呈显著正相关关系，深圳市土壤中PAHs生态风险总体处于较低水平. |
| 英文摘要 |
| 188 surface soil samples were collected in Shenzhen of China to determine the occurrence and spatial differentiation of polycyclic aromatic hydrocarbons (PAHs), based on which we studied the correlation between PAHs concentrations and urbanization levels, as well as the PAHs ecological risk. The total concentrations of 28 PAHs (∑28PAHs), 16 EPA PAHs (∑16PAHs) and 7 carcinogenic PAHs (∑7CarPAHs) ranged from 5 to 7939 ng·g-1, 2 to 6745 ng·g-1 and not detected to 3786 ng·g-1, respectively. 8 kinds of land use types according to ∑16PAHs average levels in descending order were: transportation lands, commercial lands, industrial lands, agricultural lands, residential lands, urban green space, orchards and woodland. And ∑16PAHs of construction and non-construction lands samples were mainly derived from combustion of various fossil fuels with contribution of 75.1% and 68.2%, respectively. Significant positive correlation was also found between PAHs concentrations of high molecular weight and urbanization levels. And PAHs pollution in the top soils of Shenzhen was at a low-end level of the world. |
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