...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Anaerobic degradation of decabromodiphenyl ether
【24h】

Anaerobic degradation of decabromodiphenyl ether

机译：十溴二苯醚的厌氧降解

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The environmental safety of decabromodiphenyl ether (BDE-209), a widely used flame retardant, has been the topic of controversial discussions during the past several years. Degradation of BDE-209 into lower brominated diphenyl ether congeners, exhibiting a higher bioaccumulation potential, has been a critical issue. Here, we report on the degradation of BDE-209 and the formation of octa- and nonabromodiphenyl ether congeners under anaerobic conditions. Sewage sludge collected from a mesophilic digester was used as the inoculum and incubated up to 238 days with and without a set of five primers. Following Soxhlet extraction and a liquid chromatography cleanup procedure, parent compounds and debromination products were analyzed by GC/HRMS. In experiments with primers, concentrations of BDE-209 decreased by 30% within 238 days. This corresponds to a pseudo-first-order degradation rate constant of 1 x 10(-3) d(-1). Without primers, the degradation rate constant was 50% lower. Formation of two nonabromodiphenyl ether and six octabromodiphenyl ether congeners proved that BDE-209 underwent reductive debromination in these experiments. Debromination occurred at the para and the meta positions, whereas debromination at the ortho position was not statistically significant. All three nonabromodiphenyl ether congeners (BDE-206, BDE-207, and BDE-208) were found to undergo reductive debromination as well. No significant change of the BDE-209 concentration and no formation of lower brominated congeners was observed in sterile control experiments. To our knowledge, this is the first report demonstrating microbially mediated reductive debromination of BDE-209 under anaerobic conditions.
机译：在过去的几年中，十溴二苯醚（BDE-209）（一种广泛使用的阻燃剂）的环境安全性一直是引起争议的话题。 BDE-209降解为低溴化二苯醚同类物，具有较高的生物蓄积潜力，这是一个关键问题。在这里，我们报告了在厌氧条件下BDE-209的降解以及八-和非溴二苯醚同类物的形成。从中温消化池中收集的污水污泥用作接种物，并在有和没有一套五种引物的情况下孵育长达238天。在索氏提取和液相色谱纯化程序之后，通过GC / HRMS分析母体化合物和脱溴产物。在使用引物的实验中，BDE-209的浓度在238天内降低了30％。这对应于1 x 10（-3）d（-1）的伪一阶退化速率常数。没有引物，降解速率常数降低了50％。形成两个九溴二苯醚和六个八溴二苯醚同类物证明，在这些实验中，BDE-209经历了还原脱溴。脱溴发生在对位和间位，而邻位脱溴在统计学上不显着。发现所有三个九溴二苯醚同系物（BDE-206，BDE-207和BDE-208）也都经过还原脱溴。在无菌对照实验中未观察到BDE-209浓度的显着变化，也未观察到低溴同类物的形成。据我们所知，这是第一份证明在厌氧条件下微生物介导的BDE-209还原脱溴的报告。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号