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首页> 外文期刊>Environmental Science & Technology >Organic Contaminant Release From Melting Snow. 1. Influence Of Chemical Partitioning
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Organic Contaminant Release From Melting Snow. 1. Influence Of Chemical Partitioning

机译：融雪中的有机污染物释放。 1.化学分区的影响

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摘要

A melting snowpack can deliver organic contaminants to terrestrial and aquatic ecosystems in the form of short and concentrated pulses. The mechanisms and kinetics of the underlying processes need to be understood to successfully integrate them into contaminant and water quality models. Controlled laboratory-based snowmelt experiments using artificially produced snow spiked with organic target contaminants reveal how chemical behavior during melting is dependent on the partitioning between the different phases within the bulk snow. Behaving similar to inorganic ions, water soluble organic chemicals, such as atrazine, are preferentially released at an early stage of melting, because such chemicals, accumulated at the snow grain surface, dissolve in the downward percolating meltwaterfront. Hydrophobic substances attached to particles, such as the larger polycyclic aromatic hydrocarbons, are often released at the very end of the melt period, because particle coagulation and snow densification render the melting snowpack an efficient filter trapping the particles. A notable fraction of volatile chemicals, such as naphthalene, will transfer from the melting snowpack to the lower atmosphere due to evaporation. Organic pollutants with intermediate partition properties, such as lindane, can easily switch between the bulk snow phases and their elution behavior is therefore more sensitive to varying snow and melt characteristics.
机译：积雪融化可以以短脉冲和集中脉冲的形式将有机污染物输送到陆生和水生生态系统。需要了解基本过程的机制和动力学，以将其成功整合到污染物和水质模型中。基于实验室的受控融雪实验使用人工生产的掺有有机目标污染物的雪融化，揭示了融化过程中的化学行为如何取决于散装雪中不同相之间的分配。类似于无机离子，水溶性有机化学物质（例如at去津）会在融化的早期阶段优先释放，因为这种积聚在雪粒表面的化学物质会溶解在向下渗流的熔体水中。附着在颗粒上的疏水性物质（例如较大的多环芳烃）通常在融化期的最后释放，因为颗粒的凝结和积雪致密化使积雪融化，成为捕获颗粒的有效过滤器。挥发性化学物质（例如萘）的显着部分将由于蒸发而从融化的雪堆转移到较低的大气层。具有中间分配特性的有机污染物（例如林丹）可以轻松在大量积雪相之间切换，因此其洗脱行为对变化的积雪和融雪特征更加敏感。

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  • 来源
    《Environmental Science & Technology》 |2009年第3期|657-662|共6页
  • 作者

    TORSTEN MEYER; YING DUAN LEI; IBRAHIM MURADI AND; FRANK WANIA;

  • 作者单位

    Department of Chemical Engineering and Applied Chemistryrnand Department of Physical and Environmental Sciences,rnUniversity of Toronto Scarborough, 1265 Military Trail,rnToronto, Ontario, Canada, MIC 1A4;

  • 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
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