Justin Bueno - Attenuated Total Reflectance-FT-IR Imaging for Rapid and Automated Detection of Gunshot Residue

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      Publication Details (including relevant citation   information):

        Bueno, J.;   Lednev, I. K., Analytical Chemistry.  2014, Just accepted.   DOI:   10.1021/ac4036718.      ACS featured   article.


      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.

      Address (URL): http://pubs.acs.org/doi/abs/10.1021/ac4036718