Abstract: Objective To develop a method of discriminating automotive paints by laser ablation inductively coupled plasma mass spectrometry.Methods 28 kinds of common automotive paints and 10 kinds of black automotive paints were ablated by laser and detected by inductively coupled plasma mass spectrometry.Samples were identified according to metal element components and elements response ratio.Results 30 kinds of automotive paints can be identified by different metal element components,the others can be identified according to different elements response ratio.The method has good reproducibility and precision(RSD) less than 10%.Conclusion The established method is simple,rapid,and almost nondestructive to samples.It is suitable for identification of automotive paints in forensic science.

Key words: forensic science, laser ablation, inductively coupled plasma mass spectrometry, automotive paint

摘要： 目的建立车辆油漆的激光剥蚀电感耦合等离子体质谱(laser ablation inductively coupled plasma mass spectrometry,LA-ICP-MS)分析方法。方法对38种车辆油漆样品采用激光剥蚀,电感耦合等离子体质谱进行测定,通过各油漆样品本含有金属元素种类和金属元素响应相对比值的差异对油漆样品进行区分。结果38种样品中有30种可直接依据所含金属元素种类的差异进行对其进行区分,其余8种依据元素间响应值比值的差异进行区分,方法重现性良好,精密度(RSD)小于10%。结论所建立的LA-ICP-MS方法简便快速、精密度良好、对样品微损,适用于法庭科学对车辆油漆的检测。

关键词: 法庭科学, 激光剥蚀, 电感耦合等离子体质谱, 车辆油漆