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首页> 外文期刊>Environmental Science & Technology >Mechanistic Model Describing the Uptake of Chemicals by Aquatic Integrative Samplers: Comparison to Data and Implications for Improved Sampler Configurations
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Mechanistic Model Describing the Uptake of Chemicals by Aquatic Integrative Samplers: Comparison to Data and Implications for Improved Sampler Configurations

机译：描述水生综合采样器吸收化学物质的机理模型：与数据的比较和对改进采样器配置的影响

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摘要

Aquatic integrative passive samplers are used to determine aqueous concentrations of polar organic pollutants, yet their uptake mechanisms are poorly understood. We introduce a one-dimensional model to simulate uptake by a passive sampler, Chemcatcher. The model considers the uptake as molecular diffusion through a series consisting of the aqueous boundary layer (ABL), the membrane filter (MF), and the sorbent disk with concurrent sorption by matrix of the MF and the disk. Uptake profiles of 20 polar chemicals measured over a week and a month were accurately modeled. Characteristic behaviors such as lag phases, linear and curved uptake, and equilibrating behavior were explained well by the model. As the model is mechanistically based, it was able to show the combined influences of the MF/water (K-MF/w) and disk/water (K-disk/w) partition coefficients, diffusion coefficients, and the ABL thickness on the sampling rates. On the basis of the model results, we offer three concrete recommendations for achieving the linear uptake needed for measuring time-weighted average concentrations: (i) use a MF that does not significantly sorb chemicals (e.g., log K-MF/w 3) to avoid lag phases, (ii) use a sorbent with strong sorption properties (e.g., log K-disk/w 6) for effective trapping of chemicals on the disk top layer, and (iii) make the ABL and/or the MF thicker so that the diffusion toward the disk slows.
机译：水生综合无源采样器用于确定极性有机污染物的水溶液浓度，但对其吸收机理了解甚少。我们引入一维模型来模拟被动采样器Chemcatcher的吸收​​。该模型将吸收视为通过一系列分子扩散，该分子扩散包括水边界层（ABL），膜过滤器（MF）和吸附剂圆盘，同时被MF和圆盘的基质吸附。精确模拟了一周和一个月内测得的20种极性化学品的吸收曲线。该模型很好地解释了滞后阶段，线性和弯曲吸收以及平衡行为等特征行为。由于该模型是基于机械的，因此能够显示MF /水（K-MF / w）和磁盘/水（K-disk / w）分配系数，扩散系数和ABL厚度对组合的影响。采样率。根据模型结果，我们提供了三个具体建议，以实现测量时间加权平均浓度所需的线性吸收：（i）使用不会显着吸收化学物质的MF（例如log K-MF / w <3 ）为避免出现滞后阶段（ii）使用具有强吸附特性的吸附剂（例如log K-disk / w> 6）有效地将化学药品捕集在磁盘顶层上，并且（iii）使ABL和/或ABL MF较厚，因此向磁盘的扩散变慢。

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  • 来源
    《Environmental Science & Technology》 |2019年第3期|1482-1489|共8页
  • 作者

    Endo Satoshi; Matsuura Yunosuke; Vermeirssen Etienne L. M.;

  • 作者单位

    Osaka City Univ, Grad Sch Engn, Sugimoto 3-3-138, Sumiyoshi, Osaka 5588585, Japan;

    Osaka City Univ, Grad Sch Engn, Sugimoto 3-3-138, Sumiyoshi, Osaka 5588585, Japan;

    EPFL, Swiss Ctr Appl Ecotoxicol Eawag, Uberlandstr 133, CH-8600 Dubendorf, Switzerland;

  • 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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