北京东南郊污灌区PAHs垂向分布规律

采用Eijkelkamp土壤采样器对北京东南郊污灌区进行了3个钻孔剖面采样，分析了土壤样品的理化参数，并且采用气相色谱-质谱联用仪对土壤样品的多环芳烃（PAHs）进行了定量分析，研究了土壤理化参数和16种PAHs从表层到5.5 m深的范围内垂向变化规律.结果表明，污灌区表层土壤中有14种PAHs检出，检出浓度在4～428 μg/kg之间，表层以下PAHs的检出种类显著减少，主要以2环和3环的萘、菲、芴、苊烯、二氢苊、荧蒽6种为主.粘粒含量、粘土矿物总量、阳离子交换容量以及总有机碳4个理化参数相互之间在垂向变化上具有一致性，均在0.05水平上显著相关.表层以下粘粒含量与低环PAHs在垂向含量变化也有较好的一致性，粘粒含量高的层位，PAHs含量也较高.从剖面PAHs含量变化可以判断，低环PAHs较易迁移，它们的迁移性强弱顺序为：二氢苊>芴>萘>菲>苊烯>荧蒽，其它高环PAHs难以迁移，仅在表层土壤中检出，说明在长期污灌条件下，迁移性较好的低环PAHs能够迁移到较深的土层中，有可能导致浅层地下水的污染.

Distribution of Polycyclic Aromatic Hydrocarbons in Soil Profiles in Southeast Suburb of Beijing Wastewater Irrigation Area

3 borehole profiles samples were collected using Eijkelkamp soil sampler from the wastewater irrigation area of Beijing Southeast suburb.The soil samples were collected from surface to 5.5 m underground every 0.5 m.Physical-chemical properties of the samples such as clay content,total amount of clay minerals,cation exchange capacity(CEC),total organic compounds(TOC),etc.were analyzed.16 polycyclic aromatic hydrocarbons(PAHs) defined by the U.S.EPA were also analyzed with gas chromatography-mass spectrometry...