作　　者： ; ; ; ; ; ; ; ; (张文具）;

机构地区： 北京大学城市与环境学院地表过程分析与模拟教育部重点实验室

出　　处： 《城市环境与城市生态》 2003年第6期272-274,共3页

摘　　要： 研究了天津污灌区土壤剖面中多环芳烃含量的分布特征,几个代表性样点的研究表明,天津市郊水稻田中PAHs含量最高,菜地含量居次,高粱地含量最低。PAHs总含量在土壤剖面的纵向分布总体上是随着土壤剖面的加深而降低。由于长期污水的淹灌作用,水稻田中PAHs含量出现了局部异常高值。用萘(Nap)、菲(Phe)和苯并[a]芘(Bap)作为高低环组分的代表物质分析PAHs在土壤剖面的分布规律,发现Nap、Phe和Bap的含量在纵向剖面上变化趋势基本相同,总体上含量随着剖面的加深而降低。比较单个组分含量在土壤剖面中的变化,在犁底层以下,Bap的含量基本上低于检测限,而Nap的含量在整个土壤剖面中均高于Bap。PAHs含量在土壤剖面上的分布主要受其物理化学性质、土壤中有机碳和粘粒含量的影响。 Vertical distribution of polycyclic aromatic hydrocarbons (PAHs) in Tianjin wastewater irrigated soil were discussed in this paper. The highest PAHs concentration was found in ripe soil, PAHs concentration in vegetable soil were the next,and the lowest concentration was found in kaoliang soil. ∑PAHs concentration peaked at or just below the soil surface and decline with depth. Exceptional high PAHs concentrations in ripe soil were found due to long period of wastewater irrigation. Vertical distribution characteristic of naphthalene(Nap)、phenanthrene(Phe) and benzo[a]pyrene(Bap) wes studied. Contents of Phe and Bap in soil profile shown similar trend,with concentrations declined with depth. Most of Bap concentration was found lower than the limit of detection below the plough layer, while Nap concentration is higher than Bap concentration through the soil profile. The physical and chemical features of PAHs、total organic carton(TOC) and clay content played major roles in affecting the vertical distribution of PAHs concentration.

关 键 词： 天津 污灌区 耕作土壤 多环芳烃 纵向分布 有机碳

领　　域： [环境科学与工程]