Time Since Discharge of China-made Type 64 and Type 92 Pistol Cartridges

BAO Liyin, ZHOU Zhifei, WANG Xiaolin, LI Yiyi, ZHANG Gang, MA Xinhe

Forensic Science and Technology ›› 2015, Vol. 40 ›› Issue (5) : 404-408. DOI: 10.16467/j.1008-3650.2015.05.014
Research Articles

Time Since Discharge of China-made Type 64 and Type 92 Pistol Cartridges

  • BAO Liyin, ZHOU Zhifei, WANG Xiaolin, LI Yiyi, ZHANG Gang, MA Xinhe
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Abstract

Estimation of cartridge discharge time is very important for the investigation of same gun-firing related cases. Accompanied with shooting, nitrate gunpowder in cartridges burns and reacts vigorously, while a large series of gaseous and solid reaction compounds are generated and absorbed onto the internal surface of cartridge cases. Experiments were conducted in order to detect the volatile nitrate organic gunshot residues (OGRS) of China-made 7.62 mm type 64 and 9 mm type 92 pistol cartridge cases. After discharged, these two cartridge cases were sampled using solid phase micro-extraction (SPME), and analyzed by gas chromatographic-thermal energy analyzer (GC-TEA).One double peak can be observed in all GC-TEA chromatogram as late as 10 days past discharge. The double peak became weaker along with the time elapsing since discharge. From the discharge time of Day 1 to Day 7, a notable peak was identified in GC-TEA chromatogram of the two cartridge cases in the test time segment from 1 to 2 min. On Day 1, it was merged by one sub-peak of weaker and sharper plus another sub-one of stronger and broader, continuing to be only a peak notably wider, becoming much weaker on Day 9, and eventually hardly seen on Day 11 after discharge. For the first time, the variety curves of the volatile nitrate organic compound content of China-made 7.62 mm type 64 and 9 mm type 92 pistol cartridge cases were developed, and the time since discharge of these two cartridge cases can be estimated.

Key words

firearm / time since discharge / gas chromatographic-thermal energy analyzer / pistol cartridge case / volatile gunshot residue / type 64 / type 92

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BAO Liyin, ZHOU Zhifei, WANG Xiaolin, LI Yiyi, ZHANG Gang, MA Xinhe. Time Since Discharge of China-made Type 64 and Type 92 Pistol Cartridges. Forensic Science and Technology. 2015, 40(5): 404-408 https://doi.org/10.16467/j.1008-3650.2015.05.014

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