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首页> 外文期刊>Environmental Science & Technology >Photolytical Transformation Rates of Individual Polybrominated Diphenyl Ethers in Technical Octabromo Diphenyl Ether (DE-79)
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Photolytical Transformation Rates of Individual Polybrominated Diphenyl Ethers in Technical Octabromo Diphenyl Ether (DE-79)

机译：工业八溴二苯醚（DE-79）中单个多溴二苯醚的光解转化速率

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摘要

Polybrominated diphenyl ethers (PBDEs) are of environmental concern due to their persistence, potential to bioaccumulate, and possible toxic effects, especially for the lower brominated homologues. Reductive denomination under UV light has been identified as the main abiotic pathway for PBDE transformation. Although the kinetics and transformation products have been determined for individual PBDE congeners in different matrices, no effort has been made to determine the kinetics of these congeners when technical mixtures are exposed to UV light We irradiated technical octabromodiphenyl ether (DE-79) in a perdeuterated solvent to determine the photolytic transformation kinetics of native PBDE congeners. Each deuterium that replaced bromine resulted in a shift to higher masses compared to the native congener, which was measured by gas chromatography with electron ionization mass spectrometry in the selected ion monitoring mode (GC/EI-MS-SIM). Tri-, tetra-, and pentabromodiphenyl ether products (BDE 28, BDE 47, BDE 49, BDE 99, BDE 100) could be proportioned to higher brominated precursors as a function of irradiation time. The kinetics of UV-irradiated single PBDE congeners matched well with results of previous studies of single congeners. However, when the same congeners were irradiated in the technical DE-79 mixture, their half-lives were longer by 20-160%. This study indicates that individually irradiated PBDE congeners behave differently than if present as a mixture. This result should be taken into account in models predicting the environmental fate of PBDEs and most likely also the mixtures of other contaminant groups.
机译：多溴二苯醚（PBDEs）由于其持久性，生物积累潜力以及可能的毒性作用（特别是对于低溴同系物而言），一直受到环境关注。紫外光下的还原型已被鉴定为PBDE转化的主要非生物途径。尽管已经确定了不同基质中单个PBDE同系物的动力学和转化产物，但是当技术混合物暴露于紫外线下时，仍未做出努力来确定这些同系物的动力学。我们在全氘化条件下用工业八溴二苯醚（DE-79）辐照。溶剂以确定天然多溴二苯醚同类物的光解转化动力学。与天然同类物相比，每个替换溴的氘都会导致质量转移，这是通过气相色谱和电子离子化质谱法以选定的离子监测模式（GC / EI-MS-SIM）进行的。三，四和五溴二苯醚产品（BDE 28，BDE 47，BDE 49，BDE 99，BDE 100）可以根据照射时间与较高溴化的前体成比例。紫外线辐照的单个多溴二苯醚同类物的动力学与先前对单个同类物的研究结果相吻合。但是，当在技术DE-79混合物中辐照相同的同类物时，它们的半衰期会延长20-160％。这项研究表明，单独照射的多溴二苯醚同系物的行为与混合物形式不同。在预测多溴二苯醚的环境命运以及最可能的是其他污染物组的混合物的模型中，应考虑到这一结果。

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  • 来源
    《Environmental Science & Technology》 |2010年第5期|p.1650-1655|共6页
  • 作者

    PAUL BENDIG; WALTER VETTER;

  • 作者单位

    Institute of Food Chemistry, University of Hohenheim, Garbenstrasse 28, D-70599 Stuttgart, Germany;

    rnInstitute of Food Chemistry, University of Hohenheim, Garbenstrasse 28, D-70599 Stuttgart, Germany;

  • 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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