Source identification of PCBs in Antarctic air by compound-specific isotope analysis of chlorine (CSIA-Cl) using HRGC/HRMS
Source identification of PCBs in Antarctic air by compound-specific isotope analysis of chlorine (CSIA-Cl) using HRGC/HRMS
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DOI：
10.1016/j.jhazmat.2023.130907
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发表时间：
2023-02-08
影响因子：
13.6
通讯作者：
Jiang，Guibin
中科院分区：
文献类型：
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作者：
Wang，Pu;Meng，Wenying;Jiang，Guibin
持久性有机污染物（POPs）在极地脆弱的环境中对生物健康的长期危害，在过去的几十年里引起了人们的极大关注。然而，关于它们在这些原始地区的来源和命运仍然存在争议。在这里，我们试图使用一种新的方法（特定化合物的氯同位素分析，CSIA-Cl），以确定在南极空气中的持久性有机污染物的来源，通过与源区比较。结果表明，气相样品中Cl（δ 37 Cl ′）的相对同位素比值变化范围为-137 ~9.04 ‰，与PCBs的logKoa值呈显著负相关（p< 0.01）。除PCB-28的δ 37 Cl ′值与温度相关外，其它各气象参数与δ 37 Cl ′值均无显著相关性（p> 0.05）。相比之下，城市（北京）空气中的δ 37 Cl ′值介于-12.8至2.03 ‰之间。南极大气中δ 37 Cl ′的变化较大，表明长距离大气传输（LRAT）对PCBs同位素分馏有明显影响。该研究为CSIA-Cl在大规模氯代持久性有机污染物源识别中的应用提供了参考。
Occurrence of persistent organic pollutants (POPs) in the Polar Regions has received great concern in the past several decades due to their long-term adverse effect on biological health in such a fragile environment. However, there is still argument over their source and fate in these pristine areas. Here we attempted to use a novel approach (compound-specific isotope analysis of chlorine, CSIA-Cl) to identify the source of POPs in Antarctic air by comparison with the source area. The results showed that the relative isotope-ratio variation of Cl (δ37Cl′) values showed a large variation from − 137 to 9.04 ‰ in the gas-phase samples, and a significantly negative correlation (p< 0.01) was obtained against the logKoa values of PCBs. There were no significant correlations (p> 0.05) observed between the δ37Cl′ values and meteorological parameters except for PCB-28 which showed temperature dependence. By contrast, the δ37Cl′ values in the urban (Beijing) air ranged from − 12.8 to 2.03 ‰. The larger variation of δ37Cl′ in Antarctic air indicated evidently influence of long-range atmospheric transport (LRAT) on isotopologue fractionation of PCBs. This study may shed light on the application of CSIA-Cl for source identification of chlorinated POPs on a large scale.