低山丘陵区焦化厂土壤中PAHs空间分布特征

为了解低山丘陵区焦化厂多环芳烃类污染物空间分布特征，对山西省低山丘陵区某106667m²焦化厂土壤中的16种多环芳烃浓度进行分析，分别从平面和垂向研究污染物迁移扩散规律，结果表明：首先，表层土壤的16种多环芳烃多分布于化产车间，在表层0~0.5m深度范围内土壤中污染物ΣPAHs浓度由高到低顺序为蒸氨洗苯区（991.33mg/kg） > 冷鼓脱硫区（406.50mg/kg） > 污水处理区（97.69mg/kg）；为说明PAHs来源，用高低环比例法进行多环芳烃单体分类计算统计，结果显示该场地的PAHs以M202，M228和M252的组合占优势，但M178仍占一定比例，因此污染源并非单一源，而是以油料燃烧释放的生成物即焦油的跑冒滴漏为主的石油源和燃烧源的混合源；其次，PAHs在不同车间的垂向分布存在差异.其中冷鼓脱硫区污染主要集中于3.0~4.0m，蒸氨洗苯区PAHs集中于地表0~0.5m，污水处理区PAHs集中于地表及深度1.0~2.0m处，这与污染区原工程工艺以及地层结构特点密切相关.

Spatial distribution characteristics of PAHs in soil at hilly areal coking plant

In order to understand spatial distribution characteristics of contaminant by polycyclic aromatic hydrocarbons (PAHs) in a hilly areal coking plant, 16PAHs' concentrations in soil were analyzed at coking plant of Shanxi Province which was about 106667 square metres and studied transition and diffusion regulation of contaminant, both horizontally and vertically. The results showed that:16kinds of PAHs in the surface soil were distributed in the production workshop, the concentrations of polycyclic aromatic in soil within superficial 0.0 to 0.5m depth ranged from ammonia benzene area (991.33mg/kg) to cold drum desulfurization area (406.50mg/kg) to sewage treatment area (97.69mg/kg). As for the source of polycyclic aromatic, high and low ring ratio method was used to classified calculate polycyclic aromatic monomers which proved that the group of M202, M228 and M252 was main component of polycyclic aromatic except for in certain percentage of M178, so the source of pollution was rather single source than mixed sources from combustion source and petroleum source which is mainly the product of burning and releasing, namely leakage and venting of tar. Vertically distribution of PAHs in different workshops was different which is closely related to the original engineering process and the stratum structural features in the contaminated area, and the pollution of cold drum desulfurization area was located on 3.0 to 4.0m depth, ammonia benzene area was 0.0 to 0.5m, however sewage treatment area was surface and 1.0 to 2.0m.