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采用GC-MS对甲醛、乙醛、丙醛、丁酮、戊醛五种物质的2,4-二硝基苯肼(DNPH)衍生物进行测定。结果表明,DNPH的热分解产物的色谱峰与甲醛-DNPH衍生物重叠,对甲醛-DNPH衍生物的检测应采用选择离子监测模式。除甲醛衍生物外,其它四种衍生物的色谱峰均表现为双峰形貌,其对应于各衍生物分子结构中的顺反异构体。衍生物的出峰顺序随碳原子数增加而增加,甲醛衍生物流出最快,戊醛衍生物流出最慢。各衍生物的分子离子峰强度较高。DNPH衍生化、GC-MS法适用于低分子醛酮的GC-MS鉴别。
The 2,4-dinitrophenylhydrazine (DNPH) derivatives of formaldehyde, acetaldehyde, propionaldehyde, butanone and pentanal were determined by GC-MS. The results showed that the chromatographic peaks of the thermal decomposition products of DNPH overlap with the formaldehyde-DNPH derivatives, and the selective ion monitoring mode should be adopted for the detection of formaldehyde-DNPH derivatives. In addition to formaldehyde derivatives, the other four derivatives of the chromatographic peaks showed a bimodal topography, which corresponds to the cis-trans isomers of the molecular structure of each derivative. The peak order of the derivatives increases with the number of carbon atoms, the formaldehyde derivatives flow out the fastest, and the pentanal derivatives flow out the slowest. Each derivative has a higher molecular ion peak intensity. DNPH derivatization, GC-MS method for GC-MS identification of low molecular weight aldehydes and ketones.