COMPETITIVE INTERACTIONS ASSOCIATED WITH CONTAMINANT SORPTION BY SOIL

与土壤污染物吸附相关的竞争性相互作用

• 批准号: 3777387
• 负责人: DAVID W HENDRICKS
• 金额: --
• 依托单位: COLORADO STATE UNIVERSITY
• 依托单位国家: 美国
• 资助国家: 美国
• 起止时间: 至
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/3777387
• 关键词: adsorption; gas chromatography; high performance liquid chromatography; mathematical model; model design /development; scintillation spectrometry; silicates; soil pollution; solute; temperature; thermodynamics; toluene; water flow; water pollution; water solution

Sorption is an important process governing the fate of contaminants in groundwater . The proposed research will assess the effect of multi-solute mixtures on sorption of contaminants by soils. Specifically, the proposed research will investigate competition among solution components for sorptive sites. Competition will be assessed experimentally by equilibrium isotherm testing, and will be modeled using stoichiometric, thermodynamic, and empirical relationships. The project will focus initially on the sorption of two organic solutes from the hazardous substance list (viz., toluene and xylene) by chromatography-grade silica and alumina. It is anticipated that later studies may involve other solutes and also natural sorbents. In the absence of specific knowledge about competition, engineers who predict the mobility of contaminants in soils at Superfund and other contaminated sites must assume that competition does not occur, and therefore may overestimate the sorptive capacity of soils. As a result, the rate of contaminant migration may be underestimated, and thus the risks posed by off-site migration of contaminants in groundwater may also be underestimated. The results of the proposed research will enable engineers to account for competition. One distinguishing feature of this project relative to other past or ongoing efforts under the Superfund program is that it will focus on sorbents characteristic of aquifer materials, which are materials for which sorption is relatively weak and, therefore, for which sorptive transport is critical to the overall migration of contamination. Another distinguishing feature of the proposed research is that it will attempt to develop theoretical or empirical relationships which can be used to predict sorption of multisolute components based upon equilibrium isotherm and thermodynamic properties of the sorbate/sorbent system. These relationships could then be incorporated into existing materials balance models for multi-solute transport through porous media to enable estimation of the chromatographic effect of competition.

吸附是控制污染物命运的重要过程 地下水。 拟议的研究将评估多溶质的影响 混合物对土壤吸附污染物的影响。 具体来说，拟议的 研究将调查解决方案组件之间的竞争 吸附位点。 竞争将通过平衡进行实验评估 等温线测试，并将使用化学计量、热力学、 和经验关系。 该项目最初将重点关注 吸附有害物质清单中的两种有机溶质（即， 甲苯和二甲苯）通过色谱级二氧化硅和氧化铝。 这是 预计后续研究可能涉及其他溶质以及天然物质 吸附剂。 在缺乏有关竞争的具体知识的情况下， 超级基金预测土壤中污染物流动性的工程师 和其他污染场地必须假设不发生竞争， 因此可能高估土壤的吸附能力。 作为一个 结果，污染物迁移的速率可能被低估，因此 地下水污染物异地迁移带来的风险可能 也被低估。 拟议研究的结果将使 工程师负责竞争。 与过去或其他项目相比，该项目的一个显着特征 超级基金计划下持续努力的重点是 含水层材料的吸附剂特性，这些材料 吸附作用相对较弱，因此，吸附运输是 对于污染物的整体迁移至关重要。 另一个有特色的 拟议研究的特点是它将尝试开发 可用于预测的理论或经验关系 基于平衡等温线的多溶质组分的吸附 吸附物/吸附剂系统的热力学性质。 这些 然后可以将关系纳入现有的物质平衡中 通过多孔介质的多溶质传输模型以进行估计 竞争的色谱效应。