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首页> 外文期刊>Environmental Science & Technology >Determination of the Specific Surface Area of Snow Using Ozonation of 1,1-Diphenylethylene
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Determination of the Specific Surface Area of Snow Using Ozonation of 1,1-Diphenylethylene

机译：1,1-二苯乙烯的臭氧化法测定雪的比表面积

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摘要

We measured the kinetics of ozonation reaction of 1,1-dipheny-lethylene (DPE) in artificial snow, produced by shock freezing of DPE aqueous solutions sprayed into liquid nitrogen. It was demonstrated that most of the reactant molecules are in direct (productive) contact with gaseous ozone, thus the technique produces snow with organic molecules largely ejected to the surface of snow grains. The kinetic data were used to evaluate the snow specific surface area (~70 cm~2 g~(-1)). This number is a measure of the availability of the molecules on the surface for chemical reaction with gaseous species. The experimental results were consistent with the Langmuir-Hinshelwood type reaction mechanism. DPE represents environmentally relevant compounds such as alkenes which can react with atmospheric ozone, and are relatively abundant in natural snow. For typical atmospheric ozone concentrations in polar areas (20 ppbv), we estimated that half-life of DPE on the surface of snow grains is ~S days at submonolayer coverages and -15 ℃.
机译：我们测量了人工雪中1，1-二苯乙烯（DPE）的臭氧氧化反应动力学，该现象是由DPE水溶液喷入液氮的激冷冷冻产生的。事实证明，大多数反应物分子与气态臭氧直接（生产性）接触，因此该技术生产的雪中有机分子大量喷射到雪粒表面。动力学数据用于评估积雪的比表面积（〜70 cm〜2 g〜（-1））。该数字是表面上分子与气态物种发生化学反应的可用性的量度。实验结果与Langmuir-Hinshelwood型反应机理一致。 DPE代表了与环境有关的化合物，例如可以与大气臭氧反应的烯烃，并且在自然雪中含量相对较高。对于极地地区（20 ppbv）的典型大气臭氧浓度，我们估计在亚单层覆盖和-15℃下，雪粒表面DPE的半衰期为〜S天。

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  • 来源
    《Environmental Science & Technology》 |2011年第23期|p.10061-10067|共7页
  • 作者

    Debajyoti Ray; Romana Kurkova; Ivana Hovorkova; Petr Klan;

  • 作者单位

    Research Centre for Toxic Compounds in the Environment, Faculty of Science, Masaryk University, Kamenice 3, 62500 Brno, Czech Republic;

    Research Centre for Toxic Compounds in the Environment, Faculty of Science, Masaryk University, Kamenice 3, 62500 Brno, Czech Republic;

    Research Centre for Toxic Compounds in the Environment, Faculty of Science, Masaryk University, Kamenice 3, 62500 Brno, Czech Republic;

    Research Centre for Toxic Compounds in the Environment, Faculty of Science, Masaryk University, Kamenice 3, 62500 Brno, Czech Republic,Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5/A8, 62500 Brno, Czech Republic;

  • 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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