MacCrehan W A, Smith K D, Rowe W F
National Institute of Standards and Technology, Gaithersburg, MD, USA.
J Forensic Sci. 1998 Jan;43(1):119-24.
Present techniques for the detection of gunshot residue rely primarily metallic primer components such as lead, barium and antimony. With the advent of reformulated primers that reduce or eliminate these elements, new methods for the detection of organic residue compounds will be needed. Micellar electrokinetic capillary electrophoresis (MECE) is one technique that has been successfully applied to the analysis of these smokeless powder residue compounds. Protocols for the recovery of the organic residue components under a variety of sampling conditions were evaluated and improved for MECE analysis. The collection of residue samples where external contaminants such as grease or blood were present on the residue substrate were investigated using both tape lifts and solvent swab protocols. In addition, residue component recovery using supercritical fluid extraction techniques was preliminarily evaluated for samples contaminated with blood.
目前用于检测枪击残留物的技术主要依赖于铅、钡和锑等金属底漆成分。随着减少或消除这些元素的新配方底漆的出现，将需要检测有机残留物化合物的新方法。胶束电动毛细管电泳（MECE）是一种已成功应用于分析这些无烟火药残留化合物的技术。对在各种采样条件下回收有机残留成分的方案进行了评估，并针对MECE分析进行了改进。使用胶带提取和溶剂擦拭方案研究了在残留底物上存在油脂或血液等外部污染物的情况下残留样品的采集。此外，还初步评估了使用超临界流体萃取技术对受血液污染的样品进行残留成分回收的情况。
