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首页> 外文期刊>American journal of applied sciences >A Comparative Study of SEM-EDX and ICP-MS Detection Based on Gunshot Residue Originated from AK-47 and M16 Rifles
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A Comparative Study of SEM-EDX and ICP-MS Detection Based on Gunshot Residue Originated from AK-47 and M16 Rifles

机译：基于AK-47和M16步枪的SEM-EDX和ICP-MS检测的比较研究源自AK-47和M16步枪

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摘要

This is a comparative study on Gunshot Residues (GSR) originated from AK-47 and M16 rifles by SEM-EDX and ICP-MS. The GSR samples were obtained from multiple body parts of the shooter (hand, cloth and helmet) with elapsed times, as well as from multiple shooting occasions. The SEM-EDX data established the different shapes and dimensions of the GSR samples and the presence of "unique particles". These particles had different elemental combinations with elements such as Pb, Ba and Sb. An automated search system was used for counting the number of 3-elements (Pb, Ba and Sb) called "characteristic particle". The samples collected from M16 showed higher number of characteristic particles than that of the AK-47. The existence of characteristic particles ranged from zero to big numbers and were different for different collecting positions. Right-lower arm gave the highest number of particles. The increase in number of shots led to an increase in single-element particles such as Pb and Sb. Number of particles was independent of the time between firearm shooting and sample collection. ICP-MS analysis showed that the heavy metal concentration increased with the number of shootings for the same source. Sb, Ba and Pb concentrations varied with the various parts of sources. The concentrations of GSR particles decreased when the elapsed time increased. These results concluded that SEM-EDX can establish the unique particles and their elemental composition and that the ICP-MS can quantify the precise concentration of heavy metals in the GSRs.
机译：这是由SEM-EDX和ICP-MS起源于AK-47和M16步枪的枪口残留物（GSR）的比较研究。 GSR样品从射手（手，布和头盔）的多个身体部位获得，经过时间，以及多次射击场合。 SEM-EDX数据建立了GSR样品的不同形状和尺寸以及“独特粒子”的存在。这些颗粒具有不同的元素组合，其中元素如Pb，Ba和Sb。自动搜索系统用于计数称为“特征粒子”的3元元素（PB，BA和SB）的数量。从M16收集的样品显示比AK-47的特征颗粒更高。特征粒子的存在范围从零到大数字，不同于不同的收集位置。右下臂给出了最多数量的颗粒。截图数量的增加导致单元素颗粒（例如Pb和Sb）的增加。粒子数与枪械拍摄和样品收集之间的时间无关。 ICP-MS分析表明，重金属浓度随着相同来源的芽的数量而增加。 Sb，Ba和Pb浓度随着来源的各个部分而变化。当经过的时间增加时，GSR颗粒的浓度降低。这些结果得出结论，SEM-EDX可以建立独特的颗粒及其元素组成，并且ICP-MS可以量化GSR中重金属的精确浓度。

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