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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±7.973μg/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.
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Gao et al. (2018) studied this question.
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