Li Shan, Gao Xiulong, Zhu Shuquan, Liang Handong
State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, Beijing 100083, China; School of Chemical & Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China.
State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, Beijing 100083, China.
Sci Total Environ. 2024 Jan 1;906:167887. doi: 10.1016/j.scitotenv.2023.167887. Epub 2023 Oct 16.
Coal and coal gangue are petrogenic sources of polycyclic aromatic hydrocarbons (PAHs), which cause adverse impacts on the environment. Raw coal, cleaned coal, slime, slack gangue, and lump gangue from the Pingshuo No. 1 Coal Preparation Plant, China, were analyzed to determine the concentrations and compositions of 16 priority parent PAHs (16PAHs) and their alkylated derivatives (aPAHs). The ∑PAH and ∑aPAH concentrations in the samples ranged from 18.7 to 139.2 mg/kg and 22.2 to 262.3 mg/kg, respectively, and ranked as follows: cleaned coal > raw coal > slime > lump gangue > slack gangue. Coal gangues had a higher proportion and lower degree of alkylation of 4-6-ring PAHs than coals. A summary analysis of references related to coal and coal gangue diagnostic ratios showed that their ratios could not be used to differentiate them from other PAH sources, indicating that the release of particulate coal and coal gangue would increase the uncertainty of environmental PAH identification results. The diagnostic ratios of coal gangue were relatively concentrated, and comparing the ratio distribution could reveal the coal gangue source PAHs. The toxicity risk of slack gangue was higher than that of lump gangue based on the benzo[a]pyrene-equivalent concentration; hence, more attention should be given to its escape to the environment.
煤炭和煤矸石是多环芳烃（PAHs）的成岩来源，会对环境造成不利影响。对中国平朔第一选煤厂的原煤、精煤、煤泥、碎矸石和块矸石进行了分析，以确定16种优先母体多环芳烃（16PAHs）及其烷基化衍生物（aPAHs）的浓度和组成。样品中∑PAH和∑aPAH的浓度分别为18.7至139.2mg/kg和22.2至262.3mg/kg，排序如下：精煤>原煤>煤泥>块矸石>碎矸石。煤矸石中4-6环多环芳烃的比例较高，烷基化程度低于煤炭。对与煤和煤矸石诊断比值相关的参考文献进行的总结分析表明，它们的比值不能用于将其与其他多环芳烃来源区分开来，这表明煤和煤矸石颗粒的释放会增加环境多环芳烃识别结果的不确定性。煤矸石的诊断比值相对集中，比较比值分布可以揭示煤矸石来源的多环芳烃。基于苯并[a]芘等效浓度，碎矸石的毒性风险高于块矸石；因此，应更加关注其向环境中的逸散。
