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首页> 外文期刊>Environmental Science & Technology >UVA/B-Induced Formation of Free Radicals from Decabromodiphenyl Ether
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UVA/B-Induced Formation of Free Radicals from Decabromodiphenyl Ether

机译：UVA / B诱导的十溴联苯醚自由基的形成

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摘要

Polybrominated diphenyl ether (PBDE) flame retardants are ubiquitous in the environment and in humans. A decabromodiphenyl ether mixture (deca-BDE) is the dominating commercial PBDE product today. Deca-BDE is degraded by UV to PBDEs with fewer bromines. We hypothesized that photodegradation of deca-BDE results in the formation of free radicals. We employed electron paramagnetic resonance (EPR) with spin trap agents to examine thefree radicals formed from UV irradiation of a deca-BDE mixture (DE-83R). The activating wavelength for deca-BDE photochemistry was in the UVA to UVB range. The yields of radicals from irradiated deca-BDE in tetrahydrofuran, dimethylformamide, and toluene were about 9-, 4-, and 7-foid higher, respectively, than from irradiated solvent alone. Radical formation increased with deca-BDE concentration and irradiation time. The quantum yield of radical formation of the deca-BDE mixture was higher than with an octa-BDE mixture (DE-79; ～2-fold), decabromobiphenyl (PBB 209; ～2-fold), de-cachlorobiphenyl (PCB 209; ～3-fold), and diphenyl ether (DE; ～6-fold), indicating the positive effects of bromine and an ether bond on radical formation. Analysis of hyperfine splittings of the spin adducts suggests that radical formation is initiated or significantly enhanced by debromination paired with hydrogen abstraction from the solvents. To our knowledge this is the first study that uses EPR to demonstrate the formation of free radicals during the photolvtic degradation of PBDEs. Our findings strongly suggest the potential of negative consequences due to radical formation during UV exposure of PBDEs in biological systems.
机译：多溴二苯醚（PBDE）阻燃剂在环境和人类中无处不在。十溴二苯醚混合物（deca-BDE）是当今主要的商用PBDE产品。十溴二苯醚被紫外线降解为溴含量较少的多溴二苯醚。我们假设十溴联苯醚的光降解会导致自由基的形成。我们将电子顺磁共振（EPR）与自旋捕集剂一起使用，以检查由十溴联苯醚（DE-83R）混合物的紫外线照射形成的自由基。十溴联苯醚光化学的激活波长在UVA至UVB范围内。在四氢呋喃，二甲基甲酰胺和甲苯中，辐照十溴联苯醚的自由基收率分别比单独辐照溶剂高约9-，4-和7-foid。自由基的形成随着十溴联苯醚浓度和辐照时间的增加而增加。十溴联苯醚混合物的自由基形成的量子产率高于八溴联苯醚混合物（DE-79；〜2倍），十溴代联苯（PBB 209；〜2倍），十氯联苯（PCB 209； Pb 209）。 （约3倍）和二苯醚（DE；约6倍），表明溴和醚键对自由基形成有积极作用。对自旋加合物的超细分裂的分析表明，自由基的形成是通过脱溴与从溶剂中提取氢配对而引发或显着增强的。据我们所知，这是第一项使用EPR证明PBDEs光降解过程中自由基形成的研究。我们的发现有力地表明了在生物系统中多溴二苯醚的紫外线暴露过程中，由于自由基的形成，可能产生负面后果。

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  • 来源
    《Environmental Science & Technology》 |2009年第7期|2581-2588|共8页
  • 作者

    YANG-WON SUH; GARRY R. BUETTNER; SUJATHA VENKATARAMAN; STEPHEN E. TRKIMER; LARRY W. ROBERTSON; GABRIELE LUDEWIG;

  • 作者单位

    Department of Occupational and Environmental Health;

    Interdisciplinary Graduate Program in Human Toxicology;

    Free Radical and Radiation Biology Program;

    Hygienic laboratory;

    Department of Occupational and Environmental Health Interdisciplinary Graduate Program in Human Toxicology;

    Department of Occupational and Environmental Health Interdisciplinary Graduate Program in Human Toxicology;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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