Wang P.,Changzhou Research Academy of Environment science |
Jiang P.,Changzhou Research Academy of Environment science |
Zhang H.,Changzhou Research Academy of Environment science |
Xu S.,Changzhou Research Academy of Environment science |
Chen L.,Changzhou Research Academy of Environment science
Research of Environmental Sciences | Year: 2015
Soil and groundwater were sampled at a 44.58×104 m2 coking plant with 16 years production history located in the southern part of Jiangsu Province. Distribution characteristics of 16 USEPA priority PAHs were assessed with statistical methods, and the polluting process was preliminarily discussed, providing data to support pollution control at the site. In the surface soil, 15 PAHs were found besides DBA, and the average of w(2-3 rings PAHs), which accounted for 92.6% of w(∑PAHs), was more than that of w(4-6 rings PAHs). On the other hand, high hydrophily naphthalene, acenaphthylene, acenaphthene, fluorene two hydrogen, phenanthrene and anthracene were found in groundwater under the plant, but did not migrate outside. PAHs pollution in both the soil and groundwater had typical regional distribution characteristics, and were the most serious at the chemical factory workshop. PAHs were enriched in the clay layer with antifouling property (Ky=1.28×10-8cm/s) at 3.0 m. Combined with the organic matter, refractory high ring PAHs migrated in solid form. As the total organic carbon (TOC) decreased with depth, in some high-concentration sampling points, high ring PAHs which could not be absorbed by the organic matter migrated to the aquifer roof (at 5.0 m) not the aquifer (at 7.0 m) as the strong hydrophobicity. Meanwhile, low ring PAHs migrated into the aquifer in dissolved form. Groundwater PAHs pollution was only investigated around the factory workshop due to the low flowing velocity (3.71×10-6cm/s). ©, 2015, Editorial department of Molecular Catalysis. All right reserved.