• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Henry's Law Constants and Removal Processes for Several Atmospheric β-Hydroxy Alkyl Nitrates
【24h】

Henry's Law Constants and Removal Processes for Several Atmospheric β-Hydroxy Alkyl Nitrates

机译：几种大气β-羟基烷基硝酸盐的亨利定律和去除过程

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 oxidation of atmospheric alkenes by OH radicals results in small yields of β-hydroxy alkyl nitrates that can then provide a vehicle for the ultimate removal of NO_x from the atmosphere. Although rainout may be an efficient mechanism for the removal of these species from the atmosphere, the Henry's law constants for these species are largely unknown. In this work, the Henry's law constants for β-hydroxy alkyl nitrates that are produced from the atmospheric oxidation of small alkenes in the presence of NO have been determined, over the temperature range 279-304 K. The compounds investigated were 2-nitrooxyethanol, 1-nitrooxy-2-propanol, 2-nitrooxy-1-propanol, 2-nitrooxy-3-butanol, 1-nitrooxy-2-butanol, and 2-nitrooxy-1-butanol. At 298 K, the measured Henry's law constants were 38 800, 10 900, 4500, 10 100, 5800, and 6 000 M/atm, respectively. From estimates of the rates of removal of these species from the lower troposphere by wet and dry deposition, OH radical reaction, and photolysis, we find that wet deposition accounts for between 26 and 60% of the removal rate, on average. Calculated atmospheric lifetimes for these species are all on the order of 2-3 days, which is long enough for long-range transport of these species to be possible. For hydroxy nitrates that retain a C=C functionality, such as the isoprene nitrates, reaction with OH is expected to be more important than wet deposition.
机译：OH自由基对大气中烯烃的氧化导致β-羟基烷基硝酸盐的收率低，然后可以为最终从大气中去除NO_x提供载体。尽管降雨可能是从大气中清除这些物种的有效机制，但这些物种的亨利定律常数在很大程度上尚不清楚。在这项工作中，已经确定了在279-304 K的温度范围内，在NO存在下由小烯烃在大气中氧化生成的β-羟基烷基硝酸盐的亨利定律常数。研究的化合物为2-硝基氧乙醇， 1-硝基氧基-2-丙醇，2-硝基氧基-1-丙醇，2-硝基氧基-3-丁醇，1-硝基氧基-2-丁醇和2-硝基氧基-1-丁醇。在298 K时，测得的亨利定律常数分别为38 800、10 900、4500、10 100、5800和6000 M / atm。根据通过湿法和干法沉积，OH自由基反应和光解作用从对流层下部清除这些物质的速率的估计，我们发现，湿法沉积平均占清除率的26％至60％。这些物种的估计大气寿命全都在2-3天的数量级上，这足以使这些物种进行远距离运输。对于保留C = C官能度的羟基硝酸盐（例如硝酸异戊二烯），与OH的反应比湿法沉积更为重要。

著录项

  • 来源
    《Environmental Science & Technology》 |1996年第12期|p.3618-3623|共6页
  • 作者

    PAUL B. SHEPSON; ELIZABETH MACKAY; KAYAMBU MUTHURAMU;

  • 作者单位

    Departments of Chemistry and of Earth and Atmospheric Sciences, Purdue University, 1393 Brown Building, West Lafayette, Indiana 47907;

  • 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

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