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Related Experiment Videos

Characterization of Printing Inks Using DART-Q-TOF-MS and Attenuated Total Reflectance (ATR) FTIR.

Rhett Williamson1, Anna Raeva1, Jose R Almirall1

  • 1Department of Chemistry and Biochemistry, International Forensic Research Institute (IFRI), Florida International University, Miami, FL, 33199.

Journal of Forensic Sciences
|April 29, 2016
PubMed
Summary

Forensic document analysis benefits from rapid chemical characterization of printing inks. Combining Direct Analysis in Real-Time Mass Spectrometry (DART-MS) and Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy (ATR-FTIR) significantly improves ink discrimination.

Keywords:
ATR-FTIRDART-Q-TOFforensic scienceprinting ink analysisquestioned document examination

Related Experiment Videos

Area of Science:

  • Forensic Science
  • Analytical Chemistry
  • Materials Science

Background:

  • Advancements in printing technology necessitate rapid, minimally destructive chemical analysis of printing inks.
  • Accurate ink characterization is crucial for forensic document analysis, enabling source discrimination and association.
  • Existing methods may lack the speed or specificity required for comprehensive forensic investigations.

Purpose of the Study:

  • To evaluate the efficacy of Direct Analysis in Real-Time Mass Spectrometry (DART-MS) and Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy (ATR-FTIR) for characterizing printing inks.
  • To assess the combined analytical power of DART-MS and ATR-FTIR for discriminating between different classes of printing inks.
  • To analyze a substantial number of ink samples across various classes directly on paper substrates.

Main Methods:

  • Utilized Direct Analysis in Real-Time Mass Spectrometry (DART-MS) to analyze semi-volatile polymeric vehicle components.
  • Employed Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy (ATR-FTIR) to determine bulk chemical components of inks.
  • Analyzed 319 samples from four ink classes (inkjets, toners, offset, intaglio) directly on paper substrates.

Main Results:

  • DART-MS effectively characterized semi-volatile polymeric components, while ATR-FTIR provided information on bulk ink constituents.
  • The combined use of DART-MS and ATR-FTIR yielded high discrimination rates: >96% for toners, 95% for inkjets, >92% for offset, and >54% for intaglio inks.
  • Complementary data from both techniques significantly enhanced the ability to differentiate inks from various sources.

Conclusions:

  • The tandem application of DART-MS and ATR-FTIR offers a powerful and efficient approach for the chemical characterization and forensic discrimination of printing inks.
  • These minimally destructive techniques provide valuable, complementary chemical information essential for forensic document examination.
  • The study demonstrates the potential of integrated spectroscopic methods for advancing the analysis of printing inks in forensic science.