...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Hexachlorocyclohexanes in the North American Atmosphere
【24h】

Hexachlorocyclohexanes in the North American Atmosphere

机译：北美大气中的六氯环己烷

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

Annually integrated air concentrations of α- and γ-hexachlorocyclohexane (HCH) were determined in 2000/2001 at 40 stations across North America using XAD-based passive air samplers to understand atmospheric distribution processes on a continental scale. Elevated levels of γ-HCH in the atmosphere of the Canadian Prairies are consistent with the ongoing use of lindane as a seed treatment on canola and confirm the feasibility of detecting the agricultural use of a pesticide using long-term integrated passive air sampling. In contrast to γ-HCH, the atmospheric concentrations of α-HCH show a rather uniform distribution across Canada and the United States, which is expected for a chemical with no current use on the continent. Higher levels in the atmosphere over Atlantic Canada can be explained by α-HCH evaporating from the waters of the Labrador Current, which is supported bythe chiral composition of α-HCH and the temperature dependence of its atmospheric concentrations along the east coast of Canada. Similarly, α-HCH is volatilizing from Lake Superior. Atmospheric HCH levels increase with elevation in the Canadian Rocky Mountains. The results suggest that evaporation, in particular from cold water bodies, is an important source of α-HCH to the North American atmosphere. Low levels of HCHs in Central America hint at efficient degradation undertropical conditions. Chiral analysis shows that (+)-α-HCH is often enriched in air over continental areas and at the Pacific Coast, which is opposite to the enantiomeric enrichment in the proximity to the Great Lakes and the Atlantic Ocean. Passive air sampling is a powerful tool to discern the large-scale variability of semivolatile and persistent organic chemicals in the atmosphere.
机译：在2000/2001年，使用基于XAD的被动空气采样器确定了北美40个站点​​的α-和γ-六氯环己烷（HCH）的年度空气综合浓度，以了解整个大陆范围的大气分布过程。加拿大大草原大气中γ-六氯环己烷的水平升高与正在使用林丹作为双低油菜籽的种子处理方法保持一致，并证实了通过长期综合被动空气采样来检测农药在农业上的可行性。与γ-六氯环己烷相反，大气中的α-六氯环己烷在加拿大和美国表现出相当均匀的分布，这是该大陆目前不使用的化学物质所期望的。加拿大大西洋上空的较高水平可以用从拉布拉多洋流中蒸发出的甲型六氯环己烷来解释，这是由甲型六氯环乙烷的手性组成及其沿加拿大东海岸的大气浓度的温度依赖性所支持的。同样，甲型六氯环己烷正在从苏必利尔湖挥发。随着加拿大落基山脉海拔的升高，大气中六氯环己烷的含量增加。结果表明，蒸发，特别是冷水体中的蒸发，是向北美洲大气排放的甲型六氯环己烷的重要来源。中美洲六氯环己烷的含量低表明在热带条件下有效降解。手性分析表明，（+）-α-六氯环己烷通常在大陆地区和太平洋海岸的空气中富集，这与大湖区和大西洋附近的对映体富集相反。被动空气采样是辨别大气中半挥发性和持久性有机化学品大规模变化的有力工具。

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