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首页> 外文期刊>Environmental toxicology and chemistry >MODELING THE ENVIRONMENTAL FATE OF PERFLUOROOCTANOIC ACID AND PERFLUOROOCTANOATE: AN INVESTIGATION OF THE ROLE OF INDIVIDUAL SPECIES PARTITIONING
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MODELING THE ENVIRONMENTAL FATE OF PERFLUOROOCTANOIC ACID AND PERFLUOROOCTANOATE: AN INVESTIGATION OF THE ROLE OF INDIVIDUAL SPECIES PARTITIONING

机译：模拟全氟辛酸和全氟辛酸的环境命运：对个体物种划分作用的调查

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摘要

A multimedia multi-species environmental fate model was developed for the conjugate pair perfluorooctanoic acid (PFOA):perfluorooctanoate (PFO). The model allows assessment of the relative contribution of each individual species, in equilibrium with each other, to the overall environmental movement of the pair. The Lake Ontario (Canada/USA) watershed system was selected for this investigation and is simulated in a single-region, seven-compartment model, including a water surface microlayer, and aqueous aerosol generation and redeposition. Results indicate that in the equilibrated presence of both PFOA and PFO, the environmental fate of the pair can be accomplished by consideration of the physical properties of the neutral acid, which govern the intermedia distribution of the pair, coupled with processes of media advection, such as air or water flow. The role of the anion, while the most populous species in the aqueous phase, appears merely to be as a source of the neutral acid for subsequent partitioning. Thus, when only the bulk aqueous phase anion concentrations are of interest a multimedia fate model is not required because these concentrations are largely predictable from the magnitude of emissions to and the advection of the phase. With neutral species partitioning, all local field measurement concentrations of the conjugate pair, PFO(A), are explained by the model to within approximately an order of magnitude, with the exception of lake sediment solids. Model results indicate that bulk aqueous phase PFO acts as a net source for PFOA to the atmosphere, where it may be subject to long-range transport (LRT). Initial calculations suggest an atmospheric LRT potential for PFO(A) of thousands of kilometers, rendering it comparable to hexachlorobenzene.
机译：针对共轭对全氟辛酸（PFOA）：全氟辛酸酯（PFO）开发了多媒体多物种环境命运模型。该模型允许评估彼此平衡的每个个体物种对对整体环境运动的相对贡献。选择了安大略湖（加拿大/美国）的分水岭系统，并在一个单区域，七室模型中进行了模拟，包括水面微层以及水气溶胶的产生和再沉积。结果表明，在PFOA和PFO均平衡存在的情况下，可通过考虑中性酸的物理性质（决定该对中间介质的分布）以及介质平流过程来实现该对环境的命运。作为空气或水的流动。阴离子的作用虽然是水相中人口最多的物质，但似乎只是作为后续分配中性酸的来源。因此，当仅关注本体水相阴离子的浓度时，就不需要多媒体命运模型，因为这些浓度很大程度上可以根据向该相的发射量和该相的平流度来预测。使用中性物种划分，该模型将共轭对的所有局部场测量浓度PFO（A）解释在大约一个数量级内，除了湖泊沉积物固体。模型结果表明，大块水相PFO可以作为PFOA排入大气的净源，在大气中它可能会受到远程运输（LRT）的影响。初步计算表明，大气中PFO（A）的LRT潜力为数千公里，使其与六氯苯相当。

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  • 来源
    《Environmental toxicology and chemistry》 |2010年第7期|P.1466-1475|共10页
  • 作者

    Eva Webster; David A. Ellis; Liisa K. Reid;

  • 作者单位

    Centre for Environmental Modelling and Chemistry, Trent University, 1600 West Bank Drive, Peterborough, Ontario K9J 7B8, Canada;

    rnCentre for Environmental Modelling and Chemistry, Trent University, 1600 West Bank Drive, Peterborough, Ontario K9J 7B8, Canada Department of Chemistry, Trent University, 1600 West Bank Drive, Peterborough, Ontario K9J 7B8, Canada;

    rnCentre for Environmental Modelling and Chemistry, Trent University, 1600 West Bank Drive, Peterborough, Ontario K9J 7B8, Canada;

  • 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
  • 关键词

    multimedia model; chemical fate; ionizing surfactants; long-range transport; aqueous aerosols;

    机译：多媒体模型;化学命运电离表面活性剂;远程运输;水性气溶胶;

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