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Volume 83
Pages 1-258 (December 2023)
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Volume 82
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Volume 81
Pages 1-188 (October 2023)
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Volume 80
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Volume 79
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Volume 78
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Volume 77
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Volume 76
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Volume 74
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Volume 73
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Volume 72
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Volume 83
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Volumes 60-71 (2022)
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Volume 71
Pages 1-108 (December 2022)
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Volume 70
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Volume 69
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Volume 68
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Volume 67
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Volume 66
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Volume 65
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Volume 64
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Volume 63
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Volume 62
Pages 1-104 (March 2022)
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Volume 61
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Volume 60
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Volume 71
- Volumes 54-59 (2021)
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- Volume 11 (2013)
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- Volume 9 (2011)
- Volume 8 (2010)
- Volume 7 (2009)
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- Volume 5 (2007)
- Volume 4 (2006)
- Volume 3 (2005)
- Volume 2 (2004)
- Volume 1 (2003)
► PAHs in the stack flue gas are dominated in the gas phase.
► Nap, AcPy, Flu, PA and AnT are the most abundant PAHs in coking process.
► PAH pollution from coal charging stage is most serious in coking process.
► PAH emission factors are estimated for charging coal and pushing coke stages.
This study set out to assess the characteristics of polycyclic aromatic hydrocarbon (PAH) emission from coking industries, with field samplings conducted at four typical coke plants. For each selected plant, stack flue gas samples were collected during processes that included charging coal into the ovens (CC), pushing coke (PC) and the combustion of coke-oven gas (CG). Sixteen individual PAHs on the US EPA priority list were analyzed by gas chromatography/mass spectrometry (GC/MS). Results showed that the total PAH concentrations in the flue gas ranged from 45.776 to 414.874 μg/m3, with the highest emission level for CC (359.545 μg/m3). The concentration of PAH emitted from the CC process in CP1 (stamp charging) was lower than that from CP3 and CP4 (top charging). Low-molecular-weight PAHs (i.e., two- to three-ring PAHs) were predominant contributors to the total PAH contents, and Nap, AcPy, Flu, PhA, and AnT were found to be the most abundant ones. Total BaPeq concentrations for CC (2.248 μg/m3) were higher than those for PC (1.838 μg/m3) and CG (1.082 μg/m3), and DbA was an important contributor to carcinogenic risk as BaP in emissions from coking processes. Particulate PAH accounted for more than 20% of the total BaPeq concentrations, which were significantly higher than the corresponding contributions to the total PAH mass concentration (5%). Both particulate and gaseous PAH should be taken into consideration when the potential toxicity risk of PAH pollution during coking processes is assessed. The mean total-PAH emission factors were 346.132 and 93.173 μg/kg for CC and PC, respectively.