在这项研究中,煤炭和煤基固体废物(煤矸石,粉煤灰,底灰,脱硫石膏和焦油残渣)从主要煤矿收集,两淮矿区的发电厂和焦化厂(LH),中国,并分析了76种多环芳烃化合物(PAC),27个正烷烃和2个类异戊二烯(植烷和普利烷)。原煤中的正构烷烃总浓度和∑76PAC(640±600和180±87μg/g)高于煤基固体废物中的正构烷烃总浓度(47±40和24±25μg/g),但低于焦油残留物(3700和63,000μg/g)。发现LH的沉积古环境主要是湖相和淡水环境,具有氧化条件和混合有机质输入,但淮南煤田比淮北煤田具有更强的氧化条件和更多的陆地有机质输入。烷基化PAC占原煤中∑76PAC的56±12%,而固体废物主要由16种EPAPAHs(66±16%)组成。煤燃烧和煤矸石风化改变了正构烷烃和PAC的结构性质,导致正构烷烃和PAC的大量损失,较高比例的父PAC,并且产物中短正烷烃的丰度增加(通过脉石风化未观察到正烷烃组成的明显变化)。原煤中PACs及其固体废物在LH中的毒性由高到低是焦油残渣,原煤,煤矸石,和燃煤产品。这项调查进一步证实,传统的诊断比率可能会扭曲源信息,并且它们不应用于评估来自原煤颗粒或煤矸石的PAC来源,而是识别点源附近的燃烧源。此外,Retene/(Retene+Chrysene)<0.03可能表示原煤颗粒的直接污染。
In this study, coal and coal-based solid wastes (coal gangue, fly ash, bottom ash, desulfurized gypsum and tar residue) were collected from major coal mines, power plants and coking plants in Lianghuai mining area (LH), China, and were analyzed for 76 polycyclic aromatic compounds (
PACs), 27 n-alkanes and 2 isoprenoids (phytane and pristane). The total n-alkanes concentrations and ∑76
PACs in raw coals (640 ± 600 and 180 ± 87 μg/g) were higher than those in coal-based solid wastes (47 ± 40 and 24 ± 25 μg/g), but were lower than those in tar residue (3700 and 63,000 μg/g). It was discovered that the depositional paleoenvironment in LH was mostly a lacustrine and freshwater environment with oxidizing conditions and mixed organic matter input, but the Huainan coalfield had stronger oxidizing conditions and more input of terrestrial organic matter than that of the Huaibei coalfield. Alkylated
PACs made up 56 ± 12 % of the ∑76PACs in raw coals, whereas solid wastes mainly consisted of 16 EPA PAHs (66 ± 16 %). Coal combustion and gangue weathering altered the structural properties of n-alkanes and PACs, resulting in a significant loss of n-alkanes and
PACs, a higher proportion of parent
PACs, and an increased abundance of short n-alkanes in the products (No apparent change of n-alkanes composition was observed through gangue weathering). The toxicity of
PACs in raw coal and its solid wastes in LH from high to low was tar residue, raw coal, coal gangue, and coal-fired products. This investigation further confirmed that traditional diagnostic ratios may distort source information, and that they should not be used to assess PACs sources from raw coal particles or coal gangues, but rather to identify combustion sources near the point source. In addition, Retene/(Retene + Chrysene) < 0.03 may indicate direct contamination of raw coal particles.