Characterization and risk assessment of polycyclic aromatic hydrocarbon emissions by coal fire in northern China
Characterization and risk assessment of polycyclic aromatic hydrocarbon emissions by coal fire in northern China
复制标题
中国北方煤火多环芳烃排放特征及风险评估
DOI：
10.1007/s10653-021-01009-7
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发表时间：
2021-06-14
影响因子：
4.2
通讯作者：
Liang, Yanci
中科院分区：
文献类型：
--
作者：
Liang, Ming;Liang, Handong;Liang, Yanci
已知煤自燃会排放多种有机致癌污染物，其中以多环芳烃（PAHs）最为突出。乌达煤田是中国北方煤火易发地区。煤火海绵（CFS）是一种海绵状污染土壤突出物，在苏海图矿区广泛存在。采用GC × GC- tofms法测定CFS中多环芳烃的浓度。中心环(A)中PAHs总浓度平均值为17416 μg kg - 1，变化范围为292 ~ 218251 μg kg - 1。此外，该研究显示出严重污染水平（1000 μg kg - 1）。以低分子量多环芳烃为主，占总多环芳烃的50%以上。其中以萘（Nap）和菲（Phe）最为突出，且Phe与Nap + Phe的相关性极显著（R2> 0.9）。研究结果表明，Nap和Phe含量可作为识别煤火排放源的新指标。癌症风险计算表明，对于儿童或成人而言，所有环已经处于潜在风险阶段（10−6-10−4）。CFS不仅是煤火相关的多环芳烃汇，也是大气多环芳烃排放源，因此值得地方当局的重视。
Coal spontaneous combustion is known to emit a variety of organic carcinogenic pollutants, polycyclic aromatic hydrocarbons (PAHs) are the most prominent. The Wuda coalfield is a coal fire-prone region in northern China. Coal fire sponges (CFS), a sponge-like contaminated soil protrusion, occur widely in the Suhaitu mining area. PAHs concentrations in CFS were measured via GC × GC-TOFMS. The average total PAHs concentration in the central annulus (A) was 17,416 μg kg−1and ranged from 292 to 218,251 μg kg−1. Moreover, the study exhibited a heavily contaminated level (1000 μg kg−1). Low molecular weight PAHs were dominant, accounting for more than 50% of the total PAHs. Among them, naphthalene (Nap) and phenanthrene (Phe) were the most prominent, and the correlation between Phe and Nap + Phe was highly significant (R2> 0.9). Our findings indicated that Nap and Phe contents may constitute a novel indicator to identify coal fire emission sources. Cancer risk calculations indicated that all annulus is already at a potential risk stage (10−6–10−4) for child or adults. CFS is not only a coal fire-associated PAH sink but also an atmospheric PAH emission source and, therefore, warrants the attention of local authorities.