Kinetics and Mechanism of Reactive Oxygen Species in a lake

由于活性氧（ROS）与一系列分子和化合物的高反应性，了解活性氧（ROS）的行为对于正确评估水生生态系统非常重要，但活性氧氧化还原反应的动力学和机制，特别是影响ROS形成的因素仍不清楚。本研究考察了腐殖质光化学反应对ROS生成的影响，发现腐殖质中芳香族含量是光照淡水系统中ROS生成的主要因素之一（如超氧化物和过氧化氢）。

Although it is important to understand the behavior of reactive oxygen species (ROS) for proper assessment of aquatic ecosystem due to the high reactivity of ROS with a range of molecules and chemical compounds, kinetics and mechanism of ROS redox reactions in particular the factor(s) influencing ROS formation still remain largely unclear. In this study, effect of photochemical reaction of humic substances on ROS generation was investigated, yielding that aromatic content in humic substance is one of major factors responsible for ROS generation (e.g., superoxide and hydrogen peroxide) in sunlit freshwater systems.