张振宇, 王冠, 王欣欣, 王萍. 火场润滑油燃烧残留物的SPME-GC/MS检验方法研究[J]. 刑事技术,2016,41(5): 395-397
ZHANG Zhenyu, WANG Guan, WANG Xinxin, WANG Ping. Using SPME-GC/MS to Identify the Lubricating Oil from Combustion Residues Likely Found at the Arson Spot[J]. Forensic Science and Technology,2016,41(5): 395-397
Using SPME-GC/MS to Identify the Lubricating Oil from Combustion Residues Likely Found at the Arson Spot
ZHANG Zhenyu1, WANG Guan2, WANG Xinxin3, WANG Ping4
1. National Police University of China, Shenyang,110035, China
2. Shijiazhuang Traffic Management Bureau of Public Security, Shijiazhuang 050000, China
3. Shandong Nuclear and Radiation Safety Monitoring Center, Jinan 250117, China
4. Institute of Forensic Science, Ministry of Public Security, Beijing 100038, China
Abstract
In this paper, the conditions of extraction and analysis were studied for the SPME-GC/MS to test the lubricating oil with its combustion residue that is likely to be left at the arson spot. The programmable temperature-rising procedure was defined for analysis of the selected lubricating oil. Four factors, of influence upon solid-phase micro-extraction (SPME), were optimized about the temperature and time for both extraction and desorption. The componential variation was respectively analyzed before and after combustion of the lubricating oil carried by different materials (wood, cotton material, paper and rubber). It was found that the better conditions for SPME should be set at the 80oC lasting 30 min for extraction and 240oC keeping 3 min for desorption. The influential order is sequentially from extraction time followed by the extraction temperature to desorption time with the succession of desorption temperature, showing their strength gradually decreasing. The minimum detectable volume of the SPME-GC/MS is about 0.2 μL injection of the lubricating oil because its major components can be measured at this quantity. For residual components combusted with their carriers, their consecutive disappearance one after another begins with the compounds of indan, follows with those of naphthaline at the prior and phenanthrene the posterior, and finally comes those containing nitrogen and/or oxygen. However, the alkane of C24~C26 is still detected even after the lubricating oil completely burns out, thereby making it the characteristic constituent for identification of the lubricating oil. Different carriers tested in this research have no impact for either the combustion or the residues left. Such results obtained above can provide the scientific basis for the analysis of lubricating oil by its combustion residues from arson spot.
De VosB, FronemanM, RohwerE, et al. Detection of petrol (gasoline) in fire debris by gas chromatography/mass spectrometry/mass spectrometry (GC/MS/MS). , 2002, 47(4): 1-21. [本文引用:1]
Fingerprint of lubricating oil is the integrated embodiment of its integrity and fuzzy matter and can be used as an effective means of lubricating oil quality control. The application of pyrolysis gas chromatography-mass spectrometry in building fingerprints of lubricating oil was studied. The factors influencing the stability of fingerprints, such as preprocessing method, pyrolytic form, gas chromatography-mass spectrometry conditions, were examined. The fingerprint library of lubrication oils was then built with typical results of the fingerprints of lubricating oils tested. Some lubricating oils were used as samples to check the accuracy of the established fingerprint and the result exceeded 99%.