Direct analysis of highly oxidised organic aerosol constituents by on-line ion trap mass spectrometry in the negative-ion mode.
Direct analysis of highly oxidised organic aerosol constituents by on-line ion trap mass spectrometry in the negative-ion mode.
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通过负离子模式下的在线离子阱质谱法直接分析高度氧化的有机气溶胶成分。
DOI：
10.1002/rcm.602
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
T. Hoffmann
中科院分区：
文献类型：
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作者：
B. Warscheid;T. Hoffmann
在线离子阱质谱 (ITMS) 能够表征复杂有机反应混合物中生物二次有机气溶胶的成分。这种实时分析是通过将空气中的颗粒直接引入质谱仪的离子源来实现的。大气压下的负离子化学电离 (APCI(-)) 被用作选择的电离方法。气溶胶由两种 C10H16-萜烯（α-蒎烯和柠檬烯）的气相臭氧分解产生，并通过在线 APCI(-)-ITMS(n) 进行研究。高度氧化的化合物被初步鉴定为重要的颗粒相产物。基于最近对源自单萜前体的多种去质子化多功能羧酸物种的低能碰撞诱导解离途径的研究（Warscheid B, Hoffmann T. Rapid Commun. Mass Spectrom. 2001; 15: 2259），形成了结构不同的 C10H16O5 和 C10H16O6 物种，例如来自单萜前体的酸性酯 提出了从柠檬烯中提取α-蒎烯和醛-羟基羧酸。
On-line ion trap mass spectrometry (ITMS) enables the characterisation of constituents of biogenic secondary organic aerosols in complex organic reaction mixtures. This real-time analysis is achieved by directly introducing the airborne particles into the ion source of the mass spectrometer. Negative-ion chemical ionisation at atmospheric pressure (APCI(-)) was used as the ionisation method of choice. The aerosols were generated from the gas-phase ozonolysis of two C10H16-terpenes (alpha-pinene and limonene), and investigated by performing on-line APCI(-)-ITMS(n). Highly oxidised compounds were tentatively identified as important particle-phase products. Based on recent investigations of low-energy collision-induced dissociation pathways of a wide range of deprotonated multifunctional carboxylic acid species derived from monoterpene precursors (Warscheid B, Hoffmann T. Rapid Commun. Mass Spectrom. 2001; 15: 2259), the formation of structurally different C10H16O5 and C10H16O6 species, such as acidic esters from alpha-pinene and aldo-hydroxycarboxylic acids from limonene, is proposed.