摘要
以深圳为研究区域，选择土壤为研究对象，以多环芳烃（polycyclicaromatichydrocarbons，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（∑28-PAHs）、16种美国环保署优控PAHs（∑16-PAHs）和7种致癌PAHs（∑-7CarPAHs）的含量范围分别为5～7939ng·g-1、2—6745ng·g-1和未检出～3786ng·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∑16-PAHs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．
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 （ ∑ 2sPAHs ）, 16 EPA PAHs （ ∑1,PAHs ） and 7 carcinogenic PAHs （ ∑ 7CarPAHs ） ranged from 5 to 7 939 ng·g-1 2 to 6745 ng·g-1 and not detected to 3 786 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 oollution in the ton soils of Shenzhen was at a low-end level of the world.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2014年第2期711-718,共8页
Environmental Science
基金
国家自然科学基金项目(41071117)
