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区域环境与生态

Concentration of polycyclic aromatic hydrocarbons in vegetable soils of the Pearl River Delta

摘要：为了探讨珠江三角洲中心区经济发达地带的多环芳烃污染水平,为有关部门制定相关的环保政策提供依据,分析了55个分别采自广州、东莞以及佛山郊区表层菜地中土壤样品的多环芳烃的含量.16种EPA(美国环保署)规定的优先控制多环芳烃含量为58～3077μg·kg^-1,均值为315μg·kg^-1,相对于土壤标准和世界其它地区的检测结果属于中等程度污染.分析结果表明,土壤中多环芳烃的含量同土壤总有机碳、碳黑存在着显著的线性关系.通过几个常用参数分析得知,广州、东莞及佛山的多环芳烃污染来源于石化污染以及化石燃料、生物质和煤炭的燃烧.据估算,广州、东莞及佛山0～20cm表层土壤中多环芳烃类的储量为1292t.

Abstract：The contents and distribution of polycyclic aromatic hydrocarbons(PAHs) in 55 surface vegetable soil samples around the urban areas of Guangzhou,Foshan and Dongguan were determined.The 16 US EPApriority PAHs ranged from 58 to 3077 μg·kg^-1 with an average of 315 μg·kg^-1 in this area.The pollution extent is moderate in comparison with many other investigations.The ratios of methylphenanthrenes to phenanthrene(MP/P);benz[a] anthracene to benz[a] anthracene plus chrysene(BaA/228);and indeno[1,2,3-cd] pyrene to indeno[1,2,3-cd] pyrene plus benzo[ghi] perylene(In/276) suggest that the source of PAHs in the soil samples are petroleum and the combustion of fossil fuels,biomass and coal.Correlation analysis shows that the PAHs content is significantly related to total organic carbon content(TOC)(R² = 0.76) and black carbon content(BC)(R² = 0.65) in the soil samples.It is estimated that the soil mass inventory of PAHs in the soils of the study region at 0~20cm depth is 1292 metric tons.