Gholami Shirin, Buttersack Tillmann, Richter Clemens, Trinter Florian, Dupuy Rémi, Cablitz Louisa, Zhou Qi, Nicolas Christophe, Shavorskiy Andrey, Diaman Dian, Hergenhahn Uwe, Winter Bernd, Bluhm Hendrik
Fritz Haber Institute of the Max Planck Society Faradayweg 4-6 14195 Berlin Germany
Sorbonne Université, CNRS, Laboratoire de Chimie Physique-Matière et Rayonnement, LCPMR F-75005 Paris Cedex 05 France.
Environ Sci Atmos. 2025 Feb 3;5(3):291-299. doi: 10.1039/d4ea00151f. eCollection 2025 Mar 13.
The interface of the oceans and aqueous aerosols with air drives many important physical and chemical processes in the environment, including the uptake of CO by the oceans. Transport across and reactions at the ocean-air boundary are in large part determined by the chemical composition of the interface, , the first few nanometers into the ocean. The main constituents of the interface, besides water molecules, are dissolved ions and amphiphilic surfactants, which are ubiquitous in nature. We have used a combination of surface tension measurements and liquid-jet X-ray photoelectron spectroscopy to investigate model seawater solutions at realistic ocean-water ion concentrations in the absence and in the presence of model surfactants. Our investigations provide a quantitative picture of the enhancement or reduction of the concentration of ions due to the presence of charged surfactants at the interface. We have also directly determined the concentration of surfactants at the interface, which is related to the ionic strength of the solution (, the "salting out" effect). Our results show that the interaction of ions and surfactants can strongly change the concentration of both classes of species at aqueous solution-air interfaces, with direct consequences for heterogeneous reactions as well as gas uptake and release at ocean-air interfaces.
海洋及水气溶胶与空气的界面驱动着环境中许多重要的物理和化学过程，包括海洋对一氧化碳的吸收。跨越海洋 - 空气边界的传输及在该边界处的反应在很大程度上取决于界面（即海洋中最初的几纳米）的化学成分。除水分子外，该界面的主要成分是溶解离子和两亲表面活性剂，它们在自然界中无处不在。我们结合表面张力测量和液体喷射X射线光电子能谱，研究了在不存在和存在模型表面活性剂的情况下，具有实际海水离子浓度的模型海水溶液。我们的研究提供了一幅由于界面处带电表面活性剂的存在而导致离子浓度增强或降低的定量图景。我们还直接测定了界面处表面活性剂的浓度，这与溶液的离子强度（即“盐析”效应）有关。我们的结果表明，离子与表面活性剂的相互作用可强烈改变水溶液 - 空气界面处这两类物质的浓度，对非均相反应以及海洋 - 空气界面处的气体吸收和释放都有直接影响。
