裂解气相色谱质谱法和红外光谱法对红色汽车油漆的比较分析.pdf

鉴定实践 Forensic Practice 中国司法鉴定2013年第5期(总第70期) 裂解气相色谱一质谱法和红外光谱法 对红色汽车油漆的比较分析 孙其然，罗仪文，徐彻 (司法部司法鉴定科学技术研究所，上海200063) 摘 要：目的应用裂解气相色谱一质谱法(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1001xmxl001xm，检测范围为4000—675cm～。Py—GC／MS检测条件：裂解温度：550。C，裂解时间：0．20min。HP一5MS色 谱柱，分流比80：l；升温程序：起始温度为40℃，保持I min，然后以8℃／min升至3000C，保持l rain。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，应在红外光谱的捡测基础上，进一步使用裂解气相色谱一质谱方法 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。 关键词：裂解气相色谱一质谱；红外光谱；微量物证；汽车油漆 中图分类号：DF794．3 文献标志码：A doi：10．3969／j．issn．1671-2072．2013．05．012 文章编号：1671—2072一(2013)05—005l一04 Comparative Analysis of Red Automobile Paints by Pyrolysis Gas Chromatography-Mass Spectrometry and Infrared Spectrometry SUN Qi—tort，LUO Yi—Well，XU Che (Institute of而rensic Science，Ministry ofJustice，Shanghai 200063，China) Abstract：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 1 001xmx l 001山m and the wave range was from 4000 to 675cm．As for Py～GC／MS。the samples were pyrolysed at 550℃for 0．20min，and separated on a HP一5MS GC column．The initial temperature was 40℃，kept for lmin，then ramped up to 300。C at 8。C／min 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—GC／MS could discriminate three red paints，but 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 informalion about the resin th