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炸药的来源鉴别在犯罪案件尤其是爆炸案件的侦查有着重要的价值。本文首次报导利用同位素比值质谱法对四个不同厂家的 TNT,即硝铵炸药的主成份 ,进行 13C和 15N的同位素比值测定。初步的结果表明 ,( 1 )根据它们的同位素比值 ,可以区分这四个厂家的 TNT;( 2 )样品用量低于 1微克 ;( 3)利用 EA和GC二种进样方式 ,获得了平行一致的数据 ;( 4 ) 13C的测定精度± 0 .2 0‰ ,15N为± 0 .40～ 0 .50‰。
The identification of the source of explosives is of great value in the investigation of criminal cases, especially explosions. This paper reports for the first time isotope ratio mass spectrometry for the determination of 13C and 15N isotope ratios for the TNT of four different manufacturers, the main component of ammonium nitrate explosives. The preliminary results show that (1) the TNTs of the four manufacturers can be distinguished according to their isotopic ratios; (2) the sample dosage is less than 1 microgram; (3) the two injections using EA and GC achieve parallel agreement Of the data; (4) 13C measurement accuracy of ± 0.2 0 ‰, 15N ± 0.40 ~ 0.50 ‰.