Bueno Justin, Lednev Igor K
Department of Chemistry, University at Albany, SUNY , 1400 Washington Avenue, Albany, New York 12222, United States.
Anal Chem. 2014 Apr 1;86(7):3389-96. doi: 10.1021/ac4036718. Epub 2014 Mar 13.
An alternative approach for the nondestructive, rapid and selective detection of gunshot residue (GSR) was investigated. A cloth substrate containing GSR particles expelled during a firearm discharge was used as an analog for the clothing of a shooting victim or a suspect discharging a firearm. An established and efficient procedure for GSR collection (tape lifting) was utilized to recover GSR particles from the cloth substrate. Microscopic-attenuated total reflectance (ATR) Fourier transform (FT) infrared (IR) spectroscopic imaging rapidly and automatically scanned large areas of the tape collection substrate and detected varying morphologies (microscopic and macroscopic) and chemical compositions (organic and inorganic) of GSR. The "spectroscopic fingerprint" of each GSR type provided unique virbrational modes, which were not characteristic of the tape collection substrate or the cloth debris which was also recovered. ATR images (maps) targeted the detection of these unique chemical markers over the mapped area. The hues of the ATR images were determined by the intensity of the signal for the chemical marker of each analyte. The spatial resolution of the technique was determined to be 4.7 μm. Therefore, all GSR particles sized 4.7 μm or larger will be resolved and detected on the tape substrate using micro-ATR imaging.
研究了一种用于非破坏性、快速且选择性检测枪击残留物（GSR）的替代方法。将含有枪支射击时喷出的GSR颗粒的布基片用作枪击受害者或开枪嫌疑人衣物的模拟物。采用一种既定且高效的GSR收集程序（胶带粘贴法）从布基片中回收GSR颗粒。显微衰减全反射（ATR）傅里叶变换（FT）红外（IR）光谱成像快速且自动地扫描胶带收集底物的大片区域，并检测GSR的不同形态（微观和宏观）及化学成分（有机和无机）。每种GSR类型的“光谱指纹”提供了独特的振动模式，这并非胶带收集底物或同时回收的布屑的特征。ATR图像（图谱）针对在映射区域内检测这些独特的化学标记物。ATR图像的色调由每种分析物化学标记物的信号强度决定。该技术的空间分辨率确定为4.7μm。因此，所有尺寸为4.7μm或更大的GSR颗粒将使用显微ATR成像在胶带底物上得到分辨和检测。
