刑事技术Issue(3)：179-183,5.DOI:10.16467/j.1008-3650.2015.03.002
常见国产枪弹的射击时间
Time Since Discharge of Chinese-made Cartridges
鲍立垠 1周志飞 1李轶昳 1王晓琳 1张刚 1马新和 1王桂强1
作者信息
摘要
Abstract
ABSTRACT:Objective The time lapse of spent cartridge usually plays an important part in gunshot crime investigation. This study conducted quantiifcational analysis of volatile nitrate organics for estimation of the discharge time of Chinese-made cartridges.Methods Volatile nitrate organic products on the internal of ifred cartridge cases, shotgun shells and gun barrels diffused into air slowly with time. After shooting, 7.62 mm model 51 pistol cartridges and 12/70 JIALING shotgun shells were sampled with solid phase micro-extraction (SPME) since discharge from day 1 and day 9, and analyzed by gas chromatography-thermal energy analyzer GC-TEA in order to detect the volatile nitrate organic of gunshot residues.Results One notable double peak detected from ifred 12/70 JIALING shotgun shells was observed in GC-TEA chromatogram. The observed double peak became weaker along with the increasing time since discharge, and it became too weak to be identiifed on day 11. Not only the existence of volatile nitrate organic compounds but also the decrease of its amount was indicated in the analysis. However, the similar double peak of volatile nitrate organic compounds, observed in 12/70 JIALING shotgun shells, was not existent at all in 7.62 mm model 51 pistol cartridges. The content of volatile nitrate organics, generated during shooting, was not enough for GC-TEA test.Conclusions For the ifrst time, the variety curves of the volatile nitrate organic compound content and the time since discharge of cartridges made in China was obtained. The test method of GC-TEA could be used in the discharge time estimation of the 12/70 JIALING shotgun shells, but not in that of the 7.62 mm model 51 pistol cartridges. For different types of cartridge, the concentration of volatile nitrate organic compound extracted from the shell has to be detectable with SPME-GC-TEA, prior to estimating the time since cartridge discharge.关键词
枪弹/弹壳/发射时间/有机射击残留物/固相微萃取/气相色谱-热能分析仪Key words
KEY WOREDS：ifrearm/cartridge case/time since discharge/organic gunshot residues/solid phase micro-extraction/gas chromatography-thermal energy analyzer分类
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鲍立垠,周志飞,李轶昳,王晓琳,张刚,马新和,王桂强..常见国产枪弹的射击时间[J].刑事技术,2015,(3):179-183,5.
