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Deposition versus Photochemical Removal of PBDEs from Lake Superior Air

机译:从苏必利尔湖空气中沉积与光化学去除多溴二苯醚

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摘要

Analysis of a sediment core collected from Siskiwit Lake, located on a remote island in Lake Superior, provides evidence that polybrominated diphenyl ethers (PBDEs) are removed effectively from the atmosphere via deposition processes during long-range transport. A mass balance model based on photochemical rate constants and data from atmospheric samples was created to understand the relative importance of various photochemical and deposition processes in removing PBDEs from the atmosphere. Photolysis rate constants were derived from UV absorption spectra of 25 PBDEs recorded in isooctane over the range of 280—350 nm at 298 K. Photolysis decays measured for BDE-3 and -7 in the gas phase were substantial compared to a well-defined chemical actinometer, indicating that their photolysis quantum yields are significant.
机译:对从位于苏必利尔湖边一个偏远岛屿上的Siskiwit湖收集的沉积物芯进行的分析提供了证据,表明长距离运输过程中通过沉积过程将多溴联苯醚(PBDEs)有效地从大气中清除了。建立了基于光化学速率常数和大气样品数据的质量平衡模型,以了解各种光化学和沉积过程对从大气中去除多溴二苯醚的相对重要性。光解速率常数来自在298 K下在280-350 nm范围内在异辛烷中记录的25种多溴二苯醚的紫外吸收光谱。与一种定义明确的化学物质相比,气相中BDE-3和-7的光解衰减显着光度计,表明它们的光解量子产率很高。

著录项

  • 来源
    《Environmental Science & Technology》 |2007年第19期|6725-6731|共7页
  • 作者单位

    School of Public and Environmental Affairs, Indiana University, Bloomington, Indiana 47405;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

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