基于微量元素与氮氧同位素比值的黑火药来源区分

Discrimination of black powder from different regions based on trace elements and the ratio of nitrogen and oxygen isotopes

收集了来自6个省份真实案件中的29个黑火药样品,对样品中微量元素和氮氧同位素进行分析,以实现不同地域来源样品的区分。选取40种元素中的10种存在显著性地域差异的元素进行主成分分析(Principle component analysis,PCA)。结果表明,不同来源样品的微量元素存在一定的特征差异,根据PCA的统计结果可以将样品分为六类,部分样品之间能够实现区分;氮氧同位素的分析结果表明,不同来源的样品具有显著的同位素特征,根据同位素分析结果能够实现绝大部分样品的区分;结合元素分析和氮氧同位素分析结果,能够实现不同黑火药样品的区分或建立不同样品之间的联系。

Twenty-nine black powder samples from real cases in 6 provinces were collected,and trace elements and nitrogen and oxygen isotopes in the samples were analyzed to distinguish different samples.Ten of the 40 elements with significant regional differences were selected for principal component analysis(principle PCA).The results showed that the trace elements of samples from different sources have certain characteristics.According to the analysis results of PCA,the samples can be divided into six categories,some samples can be distinguished;the analysis results of nitrogen and oxygen isotopes show that samples from different sources have significant isotopic characteristics,and most samples can be distinguished according to the isotope analysis results;combined with the results of elemental analysis and nitrogen and oxygen isotope analysis,the distinguish between different samples can be made and the connection between different samples can be established.