Distributions of Polycyclic Aromatic Hydrocarbons in Coal in China
Bo Gao 1  
,   Qiyan Feng 1, 2  
,   Lai Zhou 1  
,   Hongwei Wu 1  
,   Easar Alam 1  
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School of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou, China
Low Carbon Energy Institute, China University of Mining and Technology, Xuzhou, China
Qiyan Feng   

China University of Mining and Technology
Submission date: 2018-01-28
Final revision date: 2018-04-01
Acceptance date: 2018-04-11
Online publication date: 2018-12-13
Publication date: 2019-02-18
Pol. J. Environ. Stud. 2019;28(3):1665–1674
Groundwater level rises rapidly when mine drainage systems stop functioning after mine closures. Free-form polycyclic aromatic hydrocarbons (PAHs) in residual pillaring and abandoned mining levels could continue to migrate because of eluviation leaching. Moreover, other aquifers are polluted with mine water through mining-induced fractures, faults, and poorly sealed drill holes. Therefore, the distributions of 16-PAHs in raw coal mined in China and the factors influencing these distributions were analyzed to assist mine closures. The results showed that the average concentration of PAHs was 10.540±7.973 μg/g in the raw coal samples, and PAHs with low molecular weights had the highest abundances, accounting for 44% of the total PAH concentration obtained. The highest concentration of 16-PAHs was observed in bituminous coals, followed by that in lignite, and the lowest is anthracite. The influence factors analysis reveals that carbon content, volatile matter, H/C, and O/C have a significant effect on PAH content in raw coals. The volatile matter and molar ratio of H/C play a leading role in the changing process in 16 PAHs, accounting for more than 60% of the total contribution.