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首页> 外文学位 >AROMATIC COMPOUND SOLUBILITY AND SORPTION ONTO SOILS IN SOLVENT/WATER MIXTURES (ORGANICS).
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AROMATIC COMPOUND SOLUBILITY AND SORPTION ONTO SOILS IN SOLVENT/WATER MIXTURES (ORGANICS).

机译：芳族化合物的溶解度和在溶剂/水混合物（有机物）中的吸附。

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摘要

This report presents the results of an investigation to: (i) evaluate the solubility of relatively hydrophobic aromatic solutes in an aqueous phase containing a miscible polar organic solvent, and (ii) determine the effect of a polar solvent in the aqueous phase on the sorption of aromatic solutes onto soils. The investigation was comprised of both theoretical and experimental developments. The results from the solubility experiments were interpreted by means of chemical thermodynamic models to predict solute solubility in solvent/water systems, and the results of the soil sorption studies were evaluated by a model which relates reduction in sorption coefficient with increase in solubility.; The results of the investigation showed that hydrophobic aromatic solutes generally display a semi-logarithmic increase in solubility with increasing volume fraction of solvent in solvent/water mixtures. This results in a semi-logarithmic decrease in the tendency for these solutes to sorb onto soil. These findings were predicted by theory. However, an important result obtained from the sorption experiments was that the increase in solute solubility does not result in a directly proportional decrease in the sorption coefficient. This is believed to be a result of the solvent swelling the soil organic carbon material and thereby increasing the accessibility of the solute to this material. The increase in solute solubility in solvent/water mixtures and the decrease in sorption partition coefficients may be predicted by chemical thermodynamic models. This information is useful for assessing near-source transport of hydrophobic aromatic solutes in soil systems in the event of a spill or discharge of solutes with a polar solvent. The predictive techniques developed in this investigation may be useful in other applications in environmental engineering, such as for estimation of aromatic solute solubility in heavily contaminated industrial wastewaters, or for evaluation of solute properties for use in analytical procedures.; The effect of solvent on the increase in solute solubility and the decrease in soil sorption is much more pronounced for the more hydrophobic solutes. Hence, the results of the investigation are particularly significant for assessment of reactions and fates for those aromatic compounds which exhibit lowest aqueous phase solubility.
机译：该报告提供了以下研究的结果：（i）评估相对疏水的芳香族溶质在含有可混溶极性有机溶剂的水相中的溶解度，以及（ii）确定极性溶剂在水相中对吸附的影响在土壤中的芳香族溶质。该调查包括理论和实验发展。通过化学热力学模型解释溶解度实验的结果，以预测在溶剂/水系统中的溶质溶解度，并通过将吸附系数降低与溶解度增加相关的模型评估土壤吸附研究的结果。研究结果表明，疏水性芳族溶质通常随着溶剂在水/溶剂混合物中的体积分数的增加而显示出半对数的溶解度增加。这导致这些溶质吸附到土壤上的趋势呈半对数下降。这些发现是理论预测的。然而，从吸附实验中获得的重要结果是溶质溶解度的增加不会导致吸附系数成正比的降低。据信这是由于溶剂使土壤有机碳材料溶胀并因此增加了溶质对该材料的可及性的结果。溶质在溶剂/水混合物中的溶解度增加和吸附分配系数的降低可以通过化学热力学模型预测。在溶质与极性溶剂溢出或排放的情况下，此信息可用于评估疏水性芳族溶质在土壤系统中的近源传输。在这项研究中开发的预测技术可能在环境工程的其他应用中很有用，例如用于评估重污染工业废水中的芳香族溶质溶解度，或评估用于分析程序的溶质性质。对于疏水性更高的溶质，溶剂对溶质溶解度增加和土壤吸附降低的影响更为明显。因此，研究结果对于评估那些表现出最低水相溶解度的芳族化合物的反应和命运特别重要。

著录项

  • 作者

    FU, JAW-KWEI.;

  • 作者单位

    Carnegie Mellon University.;

  • 授予单位 Carnegie Mellon University.;
  • 学科 Engineering Civil.; Agriculture Agronomy.
  • 学位 Ph.D.
  • 年度 1985
  • 页码 244 p.
  • 总页数 244
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;农学（农艺学）;
  • 关键词

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