Levels and fingerprints of chlorinated aromatic hydrocarbons in fly ashes from the typical industrial thermal processes: Implication for the co-formation mechanism
Levels and fingerprints of chlorinated aromatic hydrocarbons in fly ashes from the typical industrial thermal processes: Implication for the co-formation mechanism
复制标题
典型工业热过程飞灰中氯化芳烃的含量和指纹：对共形成机制的影响
DOI：
10.1016/j.chemosphere.2019.02.117
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发表时间：
2019-06-01
期刊：
影响因子：
8.8
通讯作者：
Chen, Jiping
中科院分区：
文献类型：
--
作者：
Fan, Yun;Ren, Meihui;Chen, Jiping
生活垃圾焚烧和钢铁厂是氯代芳烃(CAHs)的两个重要来源。本研究同时对生活垃圾焚烧厂、铁矿烧结厂和钢铁冶炼厂飞灰样品中的多氯二苯并对二恶英和二苯并呋喃(PCDD/FS)、多氯联苯(PCBS)、多氯联苯(PCNS)和氯化多环芳烃(Cl-PAHs)等典型CAHs进行了鉴定和定量。不同飞灰中定量的CAHs总量差异很大(5.88~4255 ng/g)。大部分飞灰样品中的氯代多环芳烃以氯代多环芳烃为主，且单氯代多环芳烃的浓度明显高于二氯代多环芳烃。垃圾焚烧飞灰中CAHs指纹图谱的主要特征是PCDDs含量较高，尤其是六元CDD同系物。然而，在IOS和SS飞灰中，四到六个CDF同系物显示出更高的丰度，并且四到八个CDF的优势是四到八个CDD的3-26倍。在四至八氯-CDF同系物、中氯PCN与多氯联苯同系物、四至八-CDD同系物之间、低氯化多氯联苯与PCN同系物之间、二氯多环芳烃同系物之间以及十十a-CB与高氯化PCN同系物之间存在很强的浓度相关性。这些结果表明，随着氯化度和芳环结构的变化，CAHs的主要形成机理可能会发生显着变化。(C)2019爱思唯尔有限公司。保留所有权利。
Municipal solid waste incineration (MSWI) and iron and steel making plants are two of important sources of chlorinated aromatic hydrocarbons (CAHs). In this study, the typical CAHs including polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), polychlorinated biphenyls (PCBs), polychlorinated naphthalenes (PCNs) and chlorinated polycyclic aromatic hydrocarbons (Cl-PAHs) in fly ash samples collected from MSWI, iron ore sintering (LOS) and steel smelting (SS) plants were simultaneously identified and quantified. The total concentrations of quantified CAHs in different fly ashes showed a large variation (5.88-4255 ng/g). Cl-PAHs were found to be predominant CAH species in most of fly ash samples, and the concentrations of mono-chlorinated PAHs in all fly ashes were obviously higher than those of di-chlorinated PAHs. The fingerprints of CAHs in MSWI fly ashes were mainly characterized by the high content of PCDDs, especially the hexa-CDD homologue. However, in IOS and SS fly ashes, tetra-to hexa-CDF homologues showed the higher abundance, and tetra-to octa-CDFs predominated over tetra- to octa-CDDs by factors of 3-26. The strong concentration correlations were observed between tetra- to octa-CDF homologues, middle-chlorinated PCN and PCB homologues, between tetra- to octa-CDD homologues, between low-chlorinated PCB and PCN homologues, between di-chlorinated PAH homologues, and between deca-CB and highly chlorinated PCN homologues. These results implied that the main formation mechanism of CAHs might be significantly varied with the change of chlorination degree and aromatic ring structure. (C) 2019 Elsevier Ltd. All rights reserved.