Gas chromatography-Orbitrap mass spectrometry screening of organic chemicals in fly ash samples from industrial sources and implications for understanding the formation mechanisms of unintentional persistent organic pollutants.
Gas chromatography-Orbitrap mass spectrometry screening of organic chemicals in fly ash samples from industrial sources and implications for understanding the formation mechanisms of unintentional persistent organic pollutants.
复制标题
DOI：
10.1016/j.scitotenv.2019.02.001
复制
发表时间：
2019-05
期刊：
影响因子：
--
通讯作者：
Lili Yang;Shen Wang;Xing Peng;M. Zheng;Yuanping Yang;K. Xiao;Guorui Liu
中科院分区：
文献类型：
--
作者：
Lili Yang;Shen Wang;Xing Peng;M. Zheng;Yuanping Yang;K. Xiao;Guorui Liu
弄清工业热工过程产生的飞灰中有机化合物的赋存状态，对于加深对有毒污染物如多环芳烃(PAHs)、卤代多环芳烃(PAHs)、二恶英(Dioxin)和其他无意的持久性有机污染物的形成机理的了解具有重要意义。建立了一种高灵敏的GC-Orbitrap/MS(GC-Orbitrap/MS)方法，并将其应用于多种工业热工过程中飞灰样品中有机污染物的筛选。GC-Orbitrap/MS方法可以检测和量化十亿分之一(Ppb)的有机污染物。总共在飞灰样品中鉴定出96种有机化合物，包括烷烃、苯衍生物、酚、多环芳烃和联苯衍生物。二次铜冶炼飞灰中含有多种含氯或溴取代基的有机化合物，它们可能是二恶英、溴化二恶英和其他二恶英类化合物形成的前体。在二次铜冶炼厂飞灰中也发现了几种氯化和溴化的多环芳烃化合物。多环芳烃是二次铝冶炼厂飞灰样品中的主要化学物质，其浓度远高于其他行业的样品。这表明不同的行业存在不同的化学形成途径。本研究对多环芳烃和二恶英的可能形成途径进行了研究和推断。这些结果加深了我们对有毒非故意持久性有机污染物形成机理的理解，有助于减少它们的源排放。
Clarifying the occurrences of organic chemicals in fly ash produced during industrial thermal processes is important for improving our understanding of the formation mechanisms of toxic pollutants such as polycyclic aromatic hydrocarbons (PAHs), halogenated PAHs, dioxins, and other unintentional persistent organic pollutants. We developed a highly sensitive gas chromatography-Orbitrap mass spectrometry (GC-Orbitrap/MS) method and applied it to screening of organic pollutants in fly ash samples from multiple industrial thermal processes. The GC-Orbitrap/MS method could detect and quantify organic pollutants at part per billion (ppb) levels. In total, 96 organic chemicals, including alkanes, benzene derivatives, phenols, polycyclic aromatic hydrocarbons, and biphenyl derivatives were identified in the fly ash samples. Several organic chemicals with chlorine or bromine substituents were abundant in secondary copper smelter fly ash, and these might act as precursors for formation of dioxins, brominated dioxins, and other dioxin-like compounds. Several chlorinated and brominated PAH compounds were also found in the secondary copper smelter fly ash. PAHs were dominant chemicals in the secondary aluminum smelter fly ash samples, and were present in much higher concentrations than in the samples from other industries. This indicates that there are different chemical formation pathways in different industries. Possible formation pathways of PAHs and dioxins were investigated and deduced in this study. These results improve our understanding of the formation mechanisms of toxic unintentional persistent organic pollutants and could be useful for reducing their source emissions.