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NCJRS Abstract

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NCJ Number: 222156 Find in a Library
Title: Direct Identification of Various Copper Phthalocyanine Pigments in Automotive Paints and Paint Smears by Laser Desorption Ionization Mass Spectrometry
Journal: Journal of Forensic Sciences  Volume:53  Issue:1  Dated:January 2008  Pages:107-115
Author(s): Tadashi Mukai Ph.D.; Hiroyuki Nakazumi Ph.D.; Shin-ichirou Kawabata M.S.; Seita Nakai B.S.; Sadao Honda M.S.; Masaru Kusatani B.S.
Date Published: January 2008
Page Count: 9
Type: Report (Study/Research)
Format: Article
Language: English
Country: United States of America
Annotation: This paper reports on the use of laser desorption mass spectrometry (LDMS) to achieve the direct identification of copper phthalocyanine (CuPc) and chlorinated CuPc in paints, in order to distinguish between blue automobile paints in the absence of a matrix.
Abstract: The LDMS data obtained from model blue paints were consistent with those obtained for the eight powder pigments tested. Further, the LDMS analyses of the 40 blue automobile paint samples show characteristic mass spectral peaks for organic pigments, such as CuPc, chlorinated CuPc, and Pigment Violet 19. LDMS analysis thus distinguished between blue organic pigments in paint films as long as the mass spectra are different; however, further elemental analysis is required in order to distinguish between blue automobile paints that have the same patterns in LDMS spectra. In spite of such limitations, LDMS analysis of the CuPc pigments is expected to be useful for the identification of blue paints in forensic analyses. This technique may also be useful for identifying the organic colored components in order to distinguish between similar blue paints. The LDMS technique offers several advantages for forensic analyses. It enables quick analysis of small paint chips, i.e., chips smaller than 0.3 square millimeters. After analysis of the samples, the integrity of the samples was maintained for additional analysis. Samples were analyzed using a laser desorption time-of-flight mass spectrometer (Kraytos/Shimadzu Kompact MALDI 2 and Shimadzu AXIMA-CFR with high resolution) outfitted with a pulsed-nitrogen laser (337 nm, 3 ns, and 3 Hz). 3 tables, 9 figures, and 25 references
Main Term(s): Criminology
Index Term(s): Auto related offenses; Forensic sciences; Investigative techniques; Mass spectroscopy; Paint analysis
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