题目：β-蒎烯和柠檬烯臭氧氧化形成的SOA中高氧化有机分子（HOMs）和低挥发性物的差异
Large differences of highly oxygenated organic molecules (HOMs) and low volatile species in SOA formed from ozonolysis of β-pinene and limonene
主讲人：2019级博士生 刘丹丹
时间： 3月23日（周四）中午12：20
地点：16教学楼221会议室
报告摘要：
二次有机气溶胶（SOA）在气候变化和公共健康方面发挥着重要作用。然而，人们对SOA的氧化状态和挥发性仍然不清楚。本研究提取理了β-蒎烯和柠檬烯臭氧氧化形成的SOA中水溶性有机物，研究其高氧化有机分子（HOMs）的有机分子特征。柠檬烯SOA中HOMs的丰度为14∼20%，高于β-蒎烯SOA（3∼13%），并随着臭氧浓度的增加呈现不同的趋势。β-蒎烯氧化产生的HOMs在高臭氧浓度下更倾向于恒定，并伴随着大量超低挥发性有机化合物（ULVOCs）的形成。柠檬烯氧化衍生的HOMs在中等臭氧浓度下更趋于稳定，其中半挥发性、低挥发性和极低挥发性有机化合物（SVOCs、LOVCs和ELVOCs）发挥了主要作用。研究结果表明，β-蒎烯和柠檬烯SOA中的HOMs和低挥发性物很不同。建议在未来的气候或暴露风险模型中考虑臭氧浓度驱动的SOA形成和演变机制，这可能使空气质量预测和管理更加准确。
Secondary organic aerosols (SOA) play a key role in climate change and public health. However, the oxidation state and volatility of SOA are still not well understood. Here, we investigated the highly oxygenated organic molecules (HOMs) in SOA formed from ozonolysis of β-pinene and limonene. Extraction of SOA from particulate matter on filter samples to analysis water-soluble organic matter. The abundance of HOMs in limonene SOA was 14∼20%, higher than in β-pinene SOA (3-∼13%) exhibiting different trends with increasing ozone concentrations. β-pinene oxidation-derived HOMs prefer to be constant at high ozone concentration, accompanied by substantial formation of ultra-low-volatility organic compounds (ULVOCs). Limonene-oxidation-derived HOMs prefer to stabilize at moderate ozone concentrations, with semi-, low-, and extremely low-volatility organic compounds (SVOCs, LOVCs, and ELVOCs) play a major role. Our findings show that HOMs and low volatile species in β-pinene and limonene SOA are largely different. The ozone concentration-driven SOA formation and evolution mechanism of monoterpene-derived SOA is suggested to be considered in future climate or exposure risk models, which may enable more accurate air quality prediction and management.
