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ISIS/RHUL联合设施的博士生研发项目分配实验时长：硅烷化修饰于二氧化硅块体的腐殖质材料将在水-矿物界面处通过水性臭氧进行氧化反应。该反应的动力学是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）大气寿命的关键依据。通过膜厚测量，可开展云过程相关的辐射传输评估，进而计算大气顶层加热量。本实验将采用新型光纤耦合式紫外-可见（UV-Vis）固液池，以测定池内氧化剂浓度。本实验依托ISIS与RHUL联合申请的自然环境研究委员会（Natural Environment Research Council, NERC）资助项目开展。此前的概念验证实验已证实我们可成功制备该膜层，现申请实验时长以推进原提案中的全部实验工作。