an analysis of smokeless powder from inside of firearm ... · and a comparison with grains of...
TRANSCRIPT
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An analysis of smokeless powder from inside of firearm barrels
and a comparison with grains of smokeless powder from clothing
Jan AndraskoNational Laboratory of Forensic
Science, Sweden
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Appearance of propellant grains on clothing
(shooting distance about 30 cm)
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CCI 7.65 mm ammunition
Smokeless powder recovered from pistol barrel
Smokeless powder on clothing
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Various shapes of smokeless powder
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Some examples of smokeless powder
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Composition of smokeless powder
• Nitrocellulose 80 – 99 %• Nitroglycerine 0 – 20% (double-base powder)• Stabilizers ca. 1%
– Diphenylamine (DPA)– Ethylcentralite (EC)– Methylcentralite (MC)– Hydroquinone– Resorcinol
• Compounds reducing smoke and muzzle flash– 2,4-Dinitrotoluen (2,4-DNT)– 2,6-Dinitrotoluen (2,6-DNT)
• Plasticizers– Diethylphthalate (DEP)– Dibutylphthalate (DBP)– Dioctylphthalate– Diphenylphthalate– etc.
• Products of the reaction between nitric oxide and stabilizers– 2-Nitrodiphenylamine < 0,1%– 4-Nitrodiphenylamine < 0,1%– N-nitrosodiphenylamine ca. 0,5 –1%
• Graphite
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Gas chromatography
GC/FID
GC/MS
Suitable mainly for qualitative analysis of propellants.Thermally unstable compounds such as nitroglycerine and N-nitrosodiphenylamine can not be determined quantitatively.The sensitivity is good – a single partially burned grain issufficient for analysis.
Micro Thermal Desorption can be performed rapidly, withoutuse of solvents for extraction.
High pressure liquid chromatography
(HPLC)
Suitable for quantitative analysis, even of thermally unstablecompounds and nitrated derivatives of stabilizers.
Extraction with methanol overnight.
Analytical methods used
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Compound Abbreviation Chemical structure
Diphenylamine DPA
N-nitrosodiphenylamine N-nitroso-DPA
2-nitrosodiphenylamine 2-nitroso-DPA
2-nitrodiphenylamine 2-nitro-DPA
4-nitrodiphenylamine 4-nitro-DPA
2,2´-dinitrodiphenylamine 2,2´-dinitro-DPA
2,4-dinitrodiphenylamine 2,4-dinitro-DPA
2,4´-dinitrodiphenylamine 2,4´-dinitro-DPA
NH
NO
NH
NO2
NH
NO2NO2
NH NO2
NH NO2
NO2
NH NO2
NO2
N
NO
NH
Possible derivatives from diphenylamine nitration
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Differences in propellant composition
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Nonfired smokeless powder (caliber .22)
manufacturer NG 2,4-DNT DPA centralite I centraliteII
DEP DBP DPP 2-nitroDPA
4-nitro DPA other peaks(ret.times)
Fiocchi + + + - + - + - + +Norma - - + - + + + - + + 20.66Vostok + - + + + - - - + + 12.57CCI + - + - + - - - + + 16.75Remington + - + - + - - - + +Schönebeck - - + - - - - - + +FN + + + - - - + - + +Lapua - - + - + - - - + +ELEY - - + - - - - - + + 23.50RWS + + + - + - + - + + 20.67Hinterberger - - + - - - - - + + 19.63Winchester + + + - - - + + + + 19.63ICI + - - - + - - - - -Remington + - + - - - + - + + 27.64Remington + - - - + - - - - -Selier&Bellot - - + - - - - - + +Winchester + + + - - - + + + + 14.68Federal + + + - + - + - + +Remington + - + - - - - - + +
DEP, DBP, DPP – diethyl-, dibutyl and diphenyl phthalate
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Nonfired smokeless powder (caliber .22)
manufacturer NG 2,4-DNT DPA centralite I centraliteII
DEP DBP DPP 2-nitroDPA
4-nitro DPA other peaks
Fiocchi 10.4 19.4 100 - 294.9 - 11.9 - 8.1 20.9Norma - - 100 - 89.1 4.8 313.8 - 3.0 5.8 20.66Vostok 19.75 - 100 52.9 1.9 - - - 11.9 34.4 12.57CCI 19.55 - 100 - 10,6 - - - 6.9 12.35 16.75Remington 12.4 - 100 - 238.3 - - - 7.6 7.8Schönebeck - - 100 - - - - - 3.35 6.2FN 45.3 3.3 100 - - - 19.2 - 19.8 49.9Lapua - - 100 - 49.85 - - - 17.1 24.7ELEY - - 100 - - - - - 3.65 4.0 23.50RWS 21.5 1.55 100 - 138.9 - 7.0 - 14.4 33.6 20.67Hinterberger - - 100 - - - - - 6.1 10.6 19.63Winchester 35.0 17.8 100 - - - 41.6 5.95 19.2 39.8 19.63ICI 11.7 - - - 100 - - - - -Remington 11.2 - 100 - - - 1.0 - 2.95 9.9 27.64Remington 24.35 - - - 100 - - - - -Selier&Bellot - - 100 - - - - - 6.0 7.3Winchester 19.4 57.15 100 - - - 26.5 377.0 11.8 18.7 14.68Federal 10.5 8.1 100 - 310.6 - 19.7 - 8.1 12.8Remington 45.8 - 100 - - - - - 50.6 91.7
DEP, DBP, DPP – diethyl-, dibutyl and diphenyl phthalate
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HPLC analysis
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GC comparison of propellant particles from clothing and firearm barrel
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GC comparison of propellant particles fromclothing and firearm barrel
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HPLC comparison of propellant particlesfrom clothing and firearm barrel
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HPLC comparison of fired and non-fired propellant
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retention time unfired cloth, largegrains
cloth, smallgrains
pistol barrel
4.0 (NG) 19.2 20.7 20.9 20.94.5 0.10 0.47 0.59 0.834.9 0.13 0.945 1.32 1.695.2 0.35 0.78 0.78 0.767.0 (N-nitrosoDPA) 27.85 28.9 30.0 32.37.2 (2,4´-dinitroDPA?) 0.11 1.22 1.58 2.527.7 (4-nitroDPA) 2.43 3.50 4.04 5.248.1 (DPA) 43.15 37.7 35.4 30.5511.5 (2-nitroDPA) 7.25 7.97 8.07 8.45
2-nitroDPA/4-nitroDPA 2.97 2.27 1.99 1.61N-nitroso/4-nitroDPA 11.45 8.24 7.42 6.16N-nitroso/2-nitroDPA 3.84 3.63 3.72 3.827.2/4-nitroDPA 0.045 0.35 0.39 0.48
Walther pistol, caliber 7.65mm
PMC smokeless powder
Quantitative analysis by HPLC
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Composition of different production lots may vary a lot (fired propellant)
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A manufacturer can sometimes change the composition of the product significantly
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Small qualitative or semiquantitative differences can be detected
(fired propellant)
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Different propellant with similar composition
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SPME holder with the fibre removed
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Ink sample for thermal desorption
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Inserting ink sample for thermal desorption
A
B
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GC analysis of single particles by micro thermal desorption