Five coal gangue samples from the Duerping Coal Mine in Shanxi, China, subjected to low-temperature combustion and their emitted gas samples were collected in situ at the combustion temperatures of 23, 33, 49, 57, and 70 °C. The concentrations of 16 polycyclic aromatic hydrocarbons (PAHs) in these samples were determined by high-performance liquid chromatography; these concentrations indicated that with decreasing combustion temperature, ∑ 16 PAHs in coal gangue tend to decrease, whereas ∑ 16 PAHs in emitted gas tend to increase. With the decrease of combustion temperature, the concentrations of Σ 6 LPAHs in coal gangue and emitted gas decreased, whereas the concentrations of Σ 10 HPAHs increased; therefore, the overall toxicity and carcinogenicity increased. The total index of PAHs in the samples ranged from 20.10 to 22.43 with a mean of 21.81. The ratio of Flua/(Flua + Pyr) ranged from 0.34 to 0.97 with a mean of 0.76. Finally, the proportions of Ant/(Ant + Phe), BaA/(BaA + Chr), and InP/(InP + Bghi) were approximately 1. These ratios and the total index of the PAHs could be used to identify the source of PAHs in the atmosphere and soil.
The contents of 16 US Environmental Protection Agency (EPA) polycyclic aromatic hydrocarbons (PAHs) in coal gangue samples with different metamorphic degrees (R0,max=1.21%, 1.47%, 1.84%, 2.05%, 3.30%) have been measured by high performance liquid chromatography (HPLC), and the characteristic distributions of PAHs in samples are studied. The results suggest that all the contents of high molecular weight polycyclic aromatic hydrocarbons (HPAHs, 4-6ring), low molecular weight polycyclic aromatic hydrocarbons (LPAHs, 2-3ring), total polycyclic aromatic hydrocarbons and the toxicity of PAHs in samples increase first and then decrease as the increase of vitrinite reflectance. The proportion of LPAHs in the ∑16PAHs decreases first and then increases, while HPAHs is opposite. Furthermore, Ant/(Ant+Phe) ranges from 0 to 0.03, Flua/(Flua+Pyr) ranges from 0 to 0.37, BaA/(BaA+Chr) ranges from 0.04 to 0.14, and total index range from 0.64 to 1.66 in samples, all of which could provide a reference for judging the source of PAHs.
The concentrations of 16 Priority Pollutant polycyclic aromatic hydrocarbons (PAHs) in coals of varying rank were determined by high-performance liquid chromatography for obtaining the distribution of PAHs in raw coal with different metamorphic degree. The results indicate that the Σ16PAHs in coal ranged from 1416.28~131786.7 and 1896.85~133012.45 ng/g respectively with a the maximum yield when R0, max=1.47%. With the increase of coal rank, the toxicity of PAHs in raw coal increases and then decreases. The range of Flua / (Flua + Pyr), Ant / (Ant + Phe) and BaA / (BaA + Chr) is 0.237~0.340, 0.073~0.085, 0.064~0.178 and the total index of PAHs ranged from 3.17 to 3.74 in coals. Above diagnostic ratios are quite distinguished from petroleum origin, coal combustion and low-temperature combustion of coal gangue in previous work, which can be used to identify the sources of PAHs in complicated environment study.
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