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Type: Artigo de periódico
Title: Fingerprinting And Aging Of Ink By Easy Ambient Sonic-spray Ionization Mass Spectrometry.
Author: Lalli, Priscila M
Sanvido, Gustavo B
Garcia, Jerusa S
Haddad, Renato
Cosso, Ricardo G
Maia, Denison R J
Zacca, Jorge J
Maldaner, Adriano O
Eberlin, Marcos N
Abstract: Using easy ambient sonic-spray ionization mass spectrometry (EASI-MS), fast and non-destructive fingerprinting identification and aging of ballpoint pen ink writings have been performed directly from paper surfaces under ordinary ambient conditions. EASI-MS data obtained directly from the ink lines showed that pens from different brands provide typical ink chemical profiles. Accelerated ink aging has also been monitored by EASI-MS revealing contrasting degradation behaviors for six different common ink dyes. As demonstrated for Basic Violet 3, some dyes display a cascade of degradation products whose abundances increase linearly with time thus functioning as 'chemical clocks' for ink aging. Analysis of questionable documents has confirmed the ink aging capabilities of EASI-MS. The order of superimposition at a crossing point has also been determined by EASI-MS. For two superimposed ink lines, continuous EASI-MS analysis has also shown that the EASI spray is able to penetrate through the layers and therefore both ink layers could be characterized.
Citation: The Analyst. v. 135, n. 4, p. 745-50, 2010-Apr.
Rights: aberto
Identifier DOI: 10.1039/b923398a
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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