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首页> 外文期刊>Environmental Science & Technology >Diffusion of PAH in Potato and Carrot Slices and Application for a Potato Model
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Diffusion of PAH in Potato and Carrot Slices and Application for a Potato Model

机译：多环芳烃在马铃薯和胡萝卜片中的扩散及其在马铃薯模型中的应用

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摘要

A method for quantifying the effect of medium composition on the diffusive mass transfer of hydrophobic organic chemicals through thin layers was applied to plant tissue. The method employs two silicone disks, one serving as source and one as sink for a series of PAHs diffusing through thin layers of water, potato tissue, and carrot tissue. Naphthalene, phenanthrene, anthracene, and fluoranthene served as model substances. Their transfer from source to sink disk was measured by HPLC to determine a velocity rate constant proportional to the diffusive conductivity. The diffusive flux through the plant tissue was modeled using Fick's first law of diffusion. Both the experimental results and the model suggest that mass transferthrough plant tissue occurs predominantly through pore water and that, therefore, the mass transfer ratio between plant tissue and water is independent of the hydrophobicity of the chemical. The findings of this study provide a convenient method to estimate the diffusion of nonvolatile organic chemicals through various plant materials. The application to a radial diffusion model suggests that "growth dilution" renders the concentration of highly hydrophobic chemicals in potatoes below their equilibrium partitioning level. This is in agreement with field results for the bioconcentration of PAHs in potatoes.
机译：将用于量化介质组成对疏水有机化学物质通过薄层的扩散传质的影响的方法应用于植物组织。该方法使用两个硅树脂盘，一个用作一系列PAH的源，另一个用作接收器，用于扩散通过水，马铃薯组织和胡萝卜组织的薄层。萘，菲，蒽和荧蒽用作模型物质。通过HPLC测量它们从源盘到沉盘的转移，以确定与扩散电导率成比例的速度常数。使用菲克第一扩散定律对通过植物组织的扩散通量进行建模。实验结果和模型均表明，通过植物组织的传质主要通过孔隙水发生，因此，植物组织和水之间的传质比与化学品的疏水性无关。这项研究的发现提供了一种方便的方法来估算非挥发性有机化学物质通过各种植物材料的扩散。径向扩散模型的应用表明，“生长稀释”使土豆中的高疏水性化学品浓度低于其平衡分配水平。这与马铃薯中PAHs生物浓缩的现场结果一致。

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