淮北矿区煤矸石多环芳烃污染特征及毒性评价

利用气相色谱-三重四级杆质谱(GC-MS/MS)对采自刘桥二矿的13件煤矸石样品(7件新鲜煤矸石样品,6件风化煤矸石样品)中16种优先级母体多环芳烃(16PAHs)和烷基多环芳烃(a-PAHs)进行了定性和定量分析.结果表明:煤矸石中不仅含有16PAHs,而且含有对应的a-PAHs,后者含量(均值587.88ng/g,...

Pollution characteristics and toxicity assessment of PAHs in coal gangue from mine aera in Huaibei

In this paper, we collected 13 gangue samples (7 fresh samples and 6 weathered samples) from Liuqiao Mine in Huaibei, and 16 parent polycyclic aromatic hydrocarbons (16 PAHs) and alkyl-polycyclic aromatic hydrocarbons (a-PAHs) were analyzed by GC-MS/MS on qualitative and quantitative. The results showed that 16PAHs and a-PAHs were generally contained in coal gangue, and the content level of a-PAHs (∑a-PAHs average 587.88ng/g, n=13) was generally higher than that of 16PAHs (∑16PAHs average 505.23ng/g, n=13). The most abundant substance was naphthalene, phenanthrene and chrysene, accounted for 15%, 33% and 15% of ∑16PAHs, respectively. Alkyl-naphthalene and alkyl-phenanthrene in the content of the advantage, accounted for 22% and 40% of ∑a-PAHs. The contents of ∑16PAHs and ∑a-PAHs in the weathered samples was higher than those in the fresh samples. Only the contents of Benzoapyrene and C₂-phenanthrene decreased after weathering, and the corresponding contents of C₁-Benzoapyrene and phenanthrene increased after weathering. The characteristic ratio shown that the coal gangue samples satisfy 0<C₀/(C₀+C₁-C₄) PHE<0.25 and 0.2<C₀/(C₀+C₁-C₅) NAP<0.55; apply these ratios to PAHs of coal, petroleum, sediment also have a good dispersion. Therefore, these ratios can be used for identify PAHs from coal gangue. Through the toxicity evaluation of coal gangue, the average Benzoapyrene toxicity equivalent concentration reached 194.60ng/g, in which a-PAH contributed most of the toxicity equivalent concentration. This study provides basic experimental data for the source of PAHs and reveals the possible ecological risks of PAHs in coal gangue.