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NCJRS Abstract

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  NCJ Number: NCJ 242953   Add to Shopping cart   Find in a Library
  Title: Improvements in Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry for Forensic Analysis
  Document URL: PDF 
  Author(s): Megan L. Mekoli ; Jonna Berry ; Stanley J. Bajic ; R. S. Houk
  Date Published: 07/2013
  Page Count: 76
  Annotation: Laser ablation inductively coupled plasma-mass spectrometry (LA-ICP-MS) was evaluated for use in the elemental analysis of tapes and copper wires for forensic comparison purposes.
  Abstract: There were five main findings. First, some elements were distributed heterogeneously in the copper wire samples, especially elements at low concentration; therefore, the section analyzed must be large enough to minimize this problem. The applicability of this procedure is not useful for very small samples. Second, many brands of tape samples were readily discriminated. Third, principal components analysis (PCA) methods that use biplots for determining which elemental signals contribute the most to the overall signal variance can be used to obtain additional information from pairwise comparisons. Fourth, large differences in performance between ns and fs laser were not evident for the copper wire samples. The fs laser rapidly ablated through the tape samples, which precluded separate analysis of the back and adhesive sides with this laser. Fifth, it was difficult to ablate only the adhesive side of tape, because the laser removed some of the underlying substrate as well. The project used both a conventional 10 ns laser and a short-pulse (100 fs) laser. PCA was used for data interpretation and for pairwise comparisons of samples based on elemental composition. 5 tables, 8 figures, and 50 references
  Main Term(s): Criminology
  Index Term(s): Metal identification ; Evidence identification and analysis ; Mass spectroscopy ; Forensics/Forensic Sciences ; Investigative techniques ; NIJ final report
  Sponsoring Agency: National Institute of Justice (NIJ)
US Department of Justice
Office of Justice Programs
United States of America
  Grant Number: 2009-DN-R-112
  Sale Source: NCJRS Photocopy Services
Box 6000
Rockville, MD 20849-6000
United States of America
  Type: Report (Study/Research) ; Report (Grant Sponsored)
  Country: United States of America
  Language: English
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