摘要
目的应用裂解气相色谱-质谱法（Py-GC/MS）和红外光谱法（IR）鉴别3种红色汽车油漆,通过二者的比较,考察Py-GC/MS法在微量物证油漆鉴定中的适用性。方法取适量固体样品直接检测。IR检测条件：红外显微镜,透射模式,光阑尺寸100μm×100μm,检测范围为4000-675cm-1。Py-GC/MS检测条件：裂解温度：550℃,裂解时间：0.20min。HP-5MS色谱柱,分流比80∶1;升温程序：起始温度为40℃,保持1 min,然后以8℃/min升至300℃,保持1 min。质谱采用EI源,扫描范围：29~350 amu。结果 3种红色汽车油漆的红外光谱、裂解图谱均能相互区分。通过裂解产物,能获得更多油漆主要成膜物质的成分信息。结论在样品量许可的条件下,应在红外光谱的检测基础上,进一步使用裂解气相色谱-质谱方法来对汽车油漆进行检测,通过互相验证,获得更准确、可靠的油漆鉴定结果。
Objective To discriminate three red automobile paints by pyrolysis gas chromatography-mass spectrometry （Py-GC/ MS）and infrared spectrometry （IR）. The feasibility of applying Py-GC/MS as a routine method in the forensic trace evidence examination of automobile paints is explored. Method Solid paint samples were analyzed directly. Infrared microscope was used for the IR analysis of paints in transmission mode. The aperture size was 100μm×100μm and the wave range was from 4000 to 675cm-1. As for Py-GC/MS, the samples were pyrolysed at 550℃ for 0.20min, and separated on a HP-5MS GC column. The initial temperature was 40℃, kept for lmin, then ramped up to 300℃ at 8℃/miu and held for lmin. Split ratio was 80：1. Electron ionization was used for mass spectrometer, with a scan range of 29-350 ainu. Results Both IR and Py-CC/MS could discriminate three red paints, hut more component information was obtained from the pyrolysis results. Conclusion When the amount of sample is allowed, Py-GC/MS ought to be applied in the examination of automobile paints as well as IR. The two methods both provide information about the resin that forms the paint fihn. With verified results, a more accurate and reliable c, onclusion of paint examination could be expected.
出处
《中国司法鉴定》
2013年第5期51-54,共4页
Chinese Journal of Forensic Sciences
基金
司法部司法鉴定科学技术研究所所级课题(2011-4)
关键词
裂解气相色谱-质谱
红外光谱
微量物证
汽车油漆
pyrolysis gas chromatography-mass spectrometl~
infrared spectrometx
trace evidence
automobile paint
