Secondary ozonides of substituted cyclohexenes: A new class of pollutants characterized by collision-induced dissociation mass spectrometry using negative chemical ionization
作者:Asger W. Nørgaard、Jacob K. Nøjgaard、Per A. Clausen、Peder Wolkoff
DOI:10.1016/j.chemosphere.2007.09.018
日期:2008.2
formed in atmospheric reactions and may be relatively stable. The secondary ozonides (SOZs) of cyclohexene (1), 1-methylcyclohexene (2), 4-isopropyl-1-methylcyclohexene (3) and 4-isopropenyl-1-methylcyclohexene (limonene) (4) have been characterized by rapid gas chromatography electron ionization (EI), negative and positive chemical ionization (CI: ammonia, isobutane and methane) and collision-induced
最近的研究表明,环烯烃的二级恶臭氧化物是在大气反应中形成的,并且可能相对稳定。快速气相色谱法已表征了环己烯(1),1-甲基环己烯(2),4-异丙基-1-甲基环己烯(3)和4-异丙烯基-1-甲基环己烯(柠檬烯)(4)的次级ozonides(SOZ)电子电离(EI),正负化学电离(CI:氨,异丁烷和甲烷)和碰撞诱导解离(CID)质谱。发现EI和正CI谱均不适用于可重复分析。但是,负CI显示稳定(MH)(-)离子并有少量碎片。(MH)(-)离子的CID导致所有四个SOZ的简单且可重现的碎裂模式,m / z 18、44和60的损失分别定为H(2)O,CO(2)和C(2)H(4)O(2)或CO(3)。因此,阴性CI-MS-MS与快速气相色谱法相结合是鉴定环己烯的次级臭氧化物的首选方法。