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首页> 外文期刊>Environmental Science & Technology >N-Nitrosodimethylamine Occurrence,Formation and Cycling in Clouds and Fogs
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N-Nitrosodimethylamine Occurrence,Formation and Cycling in Clouds and Fogs

机译：N-亚硝基二甲胺在云雾中的发生，形成和循环

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摘要

The occurrence, source, and sink processes of N-nrtrosodi-methylamine (NDMA) have been explored by means of combined laboratory, field, and model studies. Observations have shown the occurrence of NDMA in fogs and clouds at substantial concentrations (7.5-397 ng L~(-1)). Laboratory studies were conducted to investigate the formation of NDMA from nitrous acid and dimethylamine in the homogeneous aqueous phase. While NDMA was produced in the aqueous phase, the low yields (<1%) observed could not explain observational concentrations. Therefore gaseous formation of NDMA with partitioning to droplets likely dominates aqueous NDMA formation. Box-model calculations confirmed the predominant contributions from gas phase formation followed by partitioning into the cloud droplets. Measurements and model calculations showed that while NDMA is eventually photolyzed, it might persist in the atmosphere for hours after sunrise and before sunset since the photolysis in the aqueous phase might be much less efficient than in the gas phase.
机译：通过结合实验室，现场和模型研究，探索了N-氨基二甲胺（NDMA）的发生，来源和吸收过程。观测表明，在浓雾（7.5-397 ng L〜（-1））下，NDMA在雾和云中的发生。进行了实验室研究，以研究在均相水相中亚硝酸和二甲胺形成NDMA的过程。尽管在水相中产生了NDMA，但观察到的低产率（<1％）不能解释观察到的浓度。因此，NDMA的气态形成和分配到液滴之间的现象很可能主导了NDMA水溶液的形成。盒模型计算证实了气相形成，然后分配成云滴的主要贡献。测量和模型计算表明，尽管NDMA最终被光解，但它可能会在日出后和日落前的几个小时内在大气中持续存在，因为水相中的光解效率可能比气相中的低得多。

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  • 来源
    《Environmental Science & Technology》 |2010年第21期|p.8128-8133|共6页
  • 作者

    JAMES W. HUTCHINCS; BARBARA ERVENS; DEREK STRAUB; PIERRE HERCKES;

  • 作者单位

    Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, CIRES;

    rnUniversity of Colorado, Boulder, Colorado,NOAA Earth Systems Research Laboratory, Chemical Sciences Division, Boulder, Colorado;

    rnDepartment of Earth and Environmental Sciences, Susquehanna University, Selinsgrove, Pennsylvania;

    rnDepartment of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, CIRES;

  • 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);
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