Hydroperoxides are of great importance in the fields of atmospheric and biological chemistry. However, there are several analytical challenges in their analysis: unknown and usually low UV absorption coefficients, high reactivity, thermal instability, and a lack of available reference standards. To overcome these limitations, we propose a GC-FID approach involving pre-column silylation and quantification via the effective carbon number approach. Four hydroperoxides of α-pinene were synthesized in the liquid phase with singlet oxygen and identified using literature data on isomer yield distribution, MS spectra, estimated boiling temperatures of each isomer (retention time), their thermal stability and derivatisation rate. The developed procedure was used for the determination of hydroperoxides in bottled and autooxidised turpentine. We anticipate that this method could also be applied in atmospheric chemistry, where the reactivity of singlet oxygen could help explain the high formation rates of secondary organic aerosols.
氢过氧化物在大气和生物化学领域具有重要意义。然而,氢过氧化物的分析存在一些挑战:紫外吸收系数未知且通常较低、反应活性高、热不稳定性以及缺乏可用的参考标准。为了克服这些限制,我们提出了一种 GC-FID 方法,包括柱前硅烷化和通过有效碳数方法进行定量。我们在液相中用单线态氧合成了 α-蒎烯的四种氢过氧化物,并利用有关异构体产率分布、质谱图、每种异构体的估计沸腾温度(保留时间)、其热稳定性和衍生率的文献数据进行了鉴定。所开发的程序用于测定瓶装松节油和自动过氧化松节油中的氢过氧化物。我们预计这种方法也可用于大气化学,因为单线态氧的反应性有助于解释二次有机气溶胶的高形成率。