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首页> 外文期刊>Environmental Science & Technology >Insights into Mechanistic Models for Evaporation of Organic Liquids in the Environment Obtained by Position-Specific Carbon Isotope Analysis
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Insights into Mechanistic Models for Evaporation of Organic Liquids in the Environment Obtained by Position-Specific Carbon Isotope Analysis

机译：通过位置特定碳同位素分析获得的环境中有机液体蒸发的机械模型的见解

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摘要

Position-specific isotope effects (PSIEs) have been measured by isotope ratio monitoring I3C nuclear magnetic resonance spectrometry during the evaporation of 10 liquids of different polarities under 4 evaporation modes (passive evaporation, air-vented evaporation, low pressure evaporation, distillation). The observed effects are used to assess the validity of the Craig-Gordon isotope model for organic liquids. For seven liquids the overall isotope effect (IE) includes a vapor-liquid contribution that is strongly position-specific in polar compounds but less so in apolar compounds and a diffusive IE that is not position-specific, except in the alcohols, ethanol and propan-1-ol. The diffusive IE is diminished under forced evaporation. The position-specific isotope pattern created by liquid-vapor IEs is manifest in five liquids, which have an air-side limitation for volatilization. For the alcohols, undefined processes in the liquid phase create additional PSIEs. Three other liquids with limitations on the liquid side have a lower, highly position-specific, bulk diffusive IE. It is concluded that evaporation of organic pollutants creates unique position-specific isotope patterns that may be used to assess the progress of remediation or natural attenuation of pollution and that the Craig-Gordon isotope model is valid for the volatilization of nonpolar organic liquids with air-side limitation of the volatilization rate.
机译：在4种蒸发模式（被动蒸发，通风蒸发，低压蒸发，蒸馏）下，通过10种不同极性的液体的蒸发，通过同位素比监测I3C核磁共振光谱法测量了位置特定的同位素效应（PSIE）。观察到的效果用于评估Craig-Gordon同位素模型对有机液体的有效性。对于七种液体，总同位素效应（IE）包括在极性化合物中具有强烈位置特异性的汽-液成分，在非极性化合物中具有强的位置特异性，而在醇，乙醇和丙烷中则具有非位置特异性的扩散IE -1-醇。在强制蒸发下，扩散IE减小。由液体-蒸汽IE产生的位置特定同位素模式体现在五种液体中，这些气体在空气中具有挥发限制。对于醇，液相中不确定的过程会产生其他PSIE。在液体方面有局限性的其他三种液体具有较低的高度特定位置的体积扩散IE。结论是，有机污染物的蒸发会产生独特的特定位置的同位素模式，可用于评估污染修复或自然衰减的进展，并且Craig-Gordon同位素模型对于非极性有机液体与空气的挥发是有效的。挥发速率的局限性。

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  • 来源
    《Environmental Science & Technology》 |2015年第21期|12782-12788|共7页
  • 作者

    Maxime Julien; Pierrick Nun; Richard J. Robins; Gerald S. Remaud; Julien Parinet; Patrick Hoehener;

  • 作者单位

    EBSI Team, CEISAM, University of Nantes-CNRS UMR 6230, 2 rue de la Houssiniere BP 92208, F-44322 Nantes, France;

    EBSI Team, CEISAM, University of Nantes-CNRS UMR 6230, 2 rue de la Houssiniere BP 92208, F-44322 Nantes, France;

    EBSI Team, CEISAM, University of Nantes-CNRS UMR 6230, 2 rue de la Houssiniere BP 92208, F-44322 Nantes, France;

    EBSI Team, CEISAM, University of Nantes-CNRS UMR 6230, 2 rue de la Houssiniere BP 92208, F-44322 Nantes, France;

    Laboratoire Chimie Environnement, University of Aix-Marseille-CNRS FRE 3416, place Victor Hugo 3, F-13331 Marseille, France;

    Laboratoire Chimie Environnement, University of Aix-Marseille-CNRS FRE 3416, place Victor Hugo 3, F-13331 Marseille, France;

  • 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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