大气颗粒物中左旋葡聚糖光化学的研究进展

Photochemistry of levoglucosan in atmospheric aerosols:A review

大量的有机污染物通过生物质燃烧排到大气中,从而影响着空气质量、气候变化以及人类健康等.左旋葡聚糖长期以来被视作生物质燃烧的标志物,在大气化学的源解析中具有重要的意义.本文综述了左旋葡聚糖的光化学稳定性,全面讨论了在实验室模拟研究中左旋葡聚糖在液相、非均相和气相等模拟条件中发生的光化学氧化反应.此外,还结合本实验室的工作总结了左旋葡聚糖的光化学机制,对比了它在不同相态中的降解速率.

A large number of organic pollutants are discharged into the atmosphere through biomass burning,thereby affecting air quality,climate change,and human health.Levoglucosan has widely been regarded as a marker of biomass burning and has important significance in the source analysis of atmospheric chemistry.This article reviews the photochemical transformation of levoglucosan and comprehensively discusses the photochemical oxidation of levoglucosan in the liquid phase,heterogeneous phase,and gas phase in the laboratory simulation.In addition,combined with the work of our laboratory,we summarized the photochemical mechanism of levoglucosan and compared its degradation rate in different phases.