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首页> 外文期刊>Environmental Science & Technology >The Overlooked Occurrence of Environmentally Persistent Free Radicals in an Area with Low-Rank Coal Burning, Xuanwei, China
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The Overlooked Occurrence of Environmentally Persistent Free Radicals in an Area with Low-Rank Coal Burning, Xuanwei, China

机译：中国宣威低燃煤地区环境持久性自由基的发生

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摘要

The mining and burning of low-rank coal in Xuanwei, China have attracted a great deal of research attention because of the generated polyaromatic hydrocarbons (PAHs) and the high incidence of lung cancer in this region. Given the abundant transition metals in the allitic soil, we hypothesized that environmentally persistent free radicals (EPFRs) are formed in this region and the potential risk had not been addressed. Strong electron paramagnetic resonance (EPR) signals of 3.20 × 10~(17) – 3.10 × 10~(19) spins/g were detected in environmental samples, including chimney soot, coal, soil and total suspended particles (TSP). These EPR signals did not significantly change after 18-months storage and had g -values in the range of 2.0039–2.0046, suggesting typical organic free radicals. Similar strong EPR signals were observed in PAH (anthracene and pyrene as model compounds) degradation on simulated soil particles and lasted over one month even when the applied PAHs were 100% degraded. Based on g -value and bond width, we propose that EPR signals detected in TSP and soot originated from both coal combustion and PAH photodegradation. Further research is thus urgently required to investigate EPFR generation, exposure and risk in Xuanwei to better understand the cause of high lung cancer incidence.
机译：由于该地区产生的多环芳烃（PAHs）和肺癌的高发率，中国宣威的低品位煤的开采和燃烧引起了很多研究关注。鉴于同化土壤中大量过渡金属，我们假设在该区域形成了环境持久性自由基（EPFR），并且尚未解决潜在的风险。在包括烟囱烟灰，煤，土壤和总悬浮颗粒（TSP）在内的环境样品中检测到了3.20×10〜（17）– 3.10×10〜（19）自旋/ g的强电子顺磁共振（EPR）信号。这些EPR信号在储存18个月后没有显着变化，其g值在2.0039–2.0046之间，表明存在典型的有机自由基。在模拟土壤颗粒上的PAH（蒽和pyr为模型化合物）降解中观察到了类似的强EPR信号，即使施加的PAHs降解了100％，这种信号也持续了一个月以上。基于g值和键宽度，我们建议在TSP和烟灰中检测到的EPR信号既来自煤燃烧又来自PAH光降解。因此迫切需要进一步的研究来调查宣威的EPFR的产生，暴露和风险，以更好地了解肺癌高发的原因。

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  • 来源
    《Environmental Science & Technology》 |2018年第3期|1054-1061|共8页
  • 作者

    Peng Wang; Bo Pan; Hao Li; Yu Huang; Xudong Dong; Fang Ai; Lingyan Liu; Min Wu; Baoshan Xing;

  • 作者单位

    Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, P. R. China;

    Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, P. R. China;

    Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, P. R. China;

    Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, P. R. China;

    The affiliated Hospital of Kunming University of Science and Technology, Kunming, 650500, China;

    The affiliated Hospital of Kunming University of Science and Technology, Kunming, 650500, China;

    The affiliated Hospital of Kunming University of Science and Technology, Kunming, 650500, China;

    Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, P. R. China;

    Stockbridge School of Agriculture, University of Massachusetts, Amherst, Massachusetts 01003, United States;

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