Oxidation of a natural organic matter at air-mineral interface by aqueous ozone II

Following a successful, one-day, proof-of-concept experiment to characterize the system, we request time for an ISIS/RHUL facility development PhD student: Humic material silanized onto silica blocks will be oxidised at the water-mineral interface using aqueous ozone. The kinetics of the reaction are critical in the assessment of the atmospheric lifetime of HUmic-Like Substances (HULIS) being cloud-processed on atmospheric mineral aerosol. Film thickness measurements will allow radiative-transfer assessment of top-of-atmosphere heating to be calculated for cloud processing. The experiments will incorporate a new fibre-optic launched UV-Vis solid-liquid cell to measure the concentration of oxidant within the cell. The experiment is for a NERC grant joint between ISIS and RHUL. The proof-of-concept demonstrated we can make the films and now we ask for time to perform the original proposal

在完成一项成功的单日系统表征概念验证实验后，我们申请为参与ISIS与RHUL设施开发项目的一名博士生预留实验时长：将硅烷修饰至二氧化硅块体上的腐殖质材料，将在水-矿物界面处通过水性臭氧实施氧化反应。该反应的动力学特性，对于评估大气矿物气溶胶上经云过程处理的类腐殖质物质（HUmic-Like Substances，HULIS）的大气寿命至关重要。通过薄膜厚度测量，可开展云过程相关的大气顶层辐射加热的辐射传输评估计算。本实验将采用一款新型光纤耦合式紫外-可见（UV-Vis）固液池，用于测量池内氧化剂的浓度。本实验依托NERC资助项目，由ISIS与RHUL联合开展。此前的概念验证实验已证实我们可制备该薄膜，现我们申请预留实验时长以执行原提案中的研究内容。