Adsorption of hydrophobic organic compounds (HOC) to inorganic surfaces in aqueous solutions

水溶液中疏水性有机化合物 (HOC) 吸附到无机表面

• 批准号: 46588721
• 负责人: Professor Dr. Torsten Schmidt
• 金额: --
• 依托单位: Arbeitsgruppe Instrumentelle Analytische Chemie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/46588721?language=en
• 关键词: Adsorption; hydrophobic; organic; compounds; HOC

Adsorption of hydrophobic organic compounds (HOCs) to fully submerged inorganic surfaces is an important process both in the environment and in water analysis. Previous investigations have shown that HOCs have a strong affinity for glass, which can obscure subsequent data interpretation when the samples have been stored in glass vials. Surprisingly, this process has nevertheless received rather little attention in comparison with sorption to organic matter. Therefore, the prediction of adsorption of HOCs to inorganic surfaces submerged in water is still hardly possible. Consequently, our project aims at a better understanding of this adsorption process, which may yield important implications for analytical and environmental science. To that end, we will utilize a chemical probe concept where we select suitable compounds based on their physicochemical properties, incorporating typical HOCs such as polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) and specific derivatives of these that facilitate electrochemical in-situ detection. We will study the adsorption process in static and dynamic systems in dependence of parameters such as solution chemistry, surface chemistry and particle size of the solid. In addition, we want to utilize the unique capabilities of electrochemical analysis for the in-situ determination of concentration gradients in solution. Here, we will focus on a further refinement and implementation of scanning electrochemical microscopy (SECM) using ultramicroelectrodes that only recently has become available.

疏水性有机化合物（HOCs）在完全浸没的无机表面上的吸附是环境和水分析中的重要过程。以前的研究表明，HOC对玻璃有很强的亲和力，当样品储存在玻璃小瓶中时，这可能会模糊随后的数据解释。令人惊讶的是，与吸附有机物相比，这一过程却很少受到关注。因此，预测HOCs在浸没于水中的无机表面上的吸附仍然是几乎不可能的。因此，我们的项目旨在更好地了解这种吸附过程，这可能会产生重要的影响，分析和环境科学。为此，我们将利用化学探针的概念，我们根据其物理化学性质选择合适的化合物，结合典型的HOCs，如多环芳烃（PAH）和多氯联苯（PCB）和这些特定的衍生物，便于电化学原位检测。我们将研究静态和动态系统中的吸附过程，如溶液化学，表面化学和固体颗粒大小的参数依赖。此外，我们希望利用电化学分析的独特功能，在溶液中的浓度梯度的原位测定。在这里，我们将集中在进一步完善和实施扫描电化学显微镜（SECM）使用超微电极，最近才成为可用的。