大气气溶胶有机示踪物的非均相氧化研究进展

Research progress on heterogeneous oxidation of organic tracers of atmospheric aerosols

为确定大气中有机气溶胶的来源与贡献,制定有效的污染防控措施,有机示踪物广泛应用于识别和评价某一特定污染源对空气质量的危害效应.然而有研究表明大气气溶胶的有机示踪物与大气氧化剂(·OH、O_(3)、NO_(3)等)发生的非均相氧化反应将导致其在源解析时产生不确定性.本文综述了现阶段关于大气气溶胶有机示踪物的非均相氧化研究进展,主要包括用于解析生物质燃烧、餐饮排放等来源气溶胶的一次有机示踪物和用于解析天然源或人为源气体前体物生成的气溶胶的二次有机示踪物.国内外学者在不同地点采用不同方法的研究均表明一直以来广泛应用于大气气溶胶源解析的有机示踪物存在不稳定性,其大气寿命也因示踪物种类和大气环境的不同而有所差异.旨在为未来修正示踪物解析准确性和相关污染防控措施的改进提供一定的参考价值.

In order to determine the source and contribution of organic aerosols in the atmosphere and take effective pollution prevention and control measures,organic tracers are widely used to identify and evaluate harmful effects of a specific pollution source on air quality.However,studies have found that the heterogeneous oxidation reactions of organic tracers of atmospheric aerosols with atmospheric oxidants(·OH,O_(3),NO_(3),etc.)could lead to uncertainties in the source apportionment.This paper reviews the current research progress on the heterogeneous oxidation of organic tracers of atmospheric aerosols,mainly including primary organic tracers used to analyze aerosols from biomass combustion and cooking emissions etc.,as well as secondary organic tracers for the analysis of natural or anthropogenic aerosols from gas phase precursors.The studies by domestic and foreign scholars using different methods in different locations have shown that the organic tracers that have been widely used in the source analysis of atmospheric organic aerosols were unstable,and their atmospheric lifetimes also changed with the types of organic tracers and the atmospheric environment.This paper aims to provide valuable references for accuracy correction of the tracerbased analysis in future studies and improvement of related pollution prevention and control measures.