福州市不同功能区土壤中多环芳烃的含量及其源解析

对福州市不同土地利用类型下5种功能区(加油站、工业区、文教区、公园和居民区)的50个土壤样品中多环芳烃(PAHs)含量进行了分析,并对土壤中PAHs的污染程度进行了评价,同时应用因子分析/多元线性回归方法对不同功能区土壤中PAHs的来源进行了解析.结果表明,福州市表层土壤中PAHs总含量的平均值为595.9μg/kg,在国内外处于中等含量水平,为轻度污染.土壤中PAHs来源以化石燃料的燃烧源为主,煤的燃烧占53%,石油燃烧占47%.不同功能区土壤都存在一定程度的PAHs污染,15种PAHs总量的大小顺序为加油站>工业区>居民区>文教区>公园,不同功能区土壤中PAHs的来源虽然有所差异,但都以化石燃料燃烧为主要来源.

Concentrations and sources of soil PAHs in various functional zones of Fuzhou City

Polycyclic aromatic hydrocarbons(PAHs) were analyzed in 50 soil samples collected from various functional zones including gas stations,industrial areas,cultural and educational areas,parks and residential areas in Fuzhou City.Meanwhile,the PAHs pollution was evaluated and the sources of soil PAHs in various functional zones were analyzed by using factor analysis/multiple linear regression method.The results showed that the average concentration of total PAHs was 595.9 μg/kg in surface soil samples of Fuzhou City,which was a moderate level in cities at home and abroad and indicated a mild level of PAHs pollution.The major source of PAHs in surface soils was the combustion of fossil fuel,in which the proportion of coal combustion and oil combustion were 63% and 47%,respectively.The soils of all the functional zones had a certain degree of PAHs pollution and the total PAHs concentrations were in the order of gas stations > industrial areas > residential areas > cultural and educational areas > parks.Though the soil PAH sources of various functional zones were different,all of the main sources of them were the combustion of fossil fuel.