...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >De novo formation of chloroethyne in soil
【24h】

De novo formation of chloroethyne in soil

机译：从头开始形成氯乙炔

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

To date, chloroethyne in the environment has been proposed to occur as a reactive intermediate during the reductive dechlorination of tri- and tetra chloroethene with zerovalent metals. Such artificial conditions might possibly be found at organohalide-contaminated sites that are surrounded by remediation barriers made of metallic iron. In this paper, it is shown that the highly reactive chloroethyne is also a product of natural processes in soil. Soil air samples from three differentterrestrial ecosystems of Northern Germany showed significant chloroethyne concentrations, besides other naturally produced monochlorinated compounds, such as chloromethane, chloroethane and chloroethene. Measured amounts range from 5 to 540 pg chloroethyne in air purged from 1 L of soil. A possible route of chloroethyne formation in soil is discussed, where chloroethyne is probably produced as a byproduct of the oxidative halogenation of aromatic compounds in soil. A series of laboratory studies, using the redox-sensitive catechol as a discrete organic model compound, showed the formation of chloroethyne when Fe3+ and hydrogen peroxide were added to the system. We therefore propose that the natural formation of chloroethyne in soil proceeds via oxidative cleavage of a quinonic system in the presence of the ubiquitous soil component chloride.
机译：迄今为止，已经提出环境中的乙炔以零价金属还原三氯乙烯和四氯乙烯的过程中作为反应中间体出现。在由金属铁制成的修复屏障所包围的受有机卤化物污染的位置，可能会发现这种人工条件。本文表明，高活性氯乙炔也是土壤中自然过程的产物。来自德国北部三个不同陆地生态系统的土壤空气样品显示出较高的氯乙炔浓度，此外还有其他自然产生的一氯化合物，例如氯甲烷，氯乙烷和氯乙烯。从1升土壤中清除的空气中，测得的氯乙炔含量为5至540 pg。讨论了土壤中氯乙炔形成的可能途径，其中氯乙炔可能是土壤中芳香族化合物氧化卤化的副产物。使用氧化还原敏感的邻苯二酚作为离散的有机模型化合物进行的一系列实验室研究表明，向系统中添加Fe3 +和过氧化氢会形成氯乙炔。因此，我们提出土壤中氯乙炔的自然形成是通过在普遍存在的土壤成分氯化物存在下奎宁体系的氧化裂解而进行的。

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