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NCJRS Abstract

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NCJ Number: 228534 Find in a Library
Title: Characterization of Undigested Particulate Material Following Microwave Digestion of Recycled Document Papers
Journal: Journal of Forensic Sciences  Volume:54  Issue:5  Dated:September 2009  Pages:1171-1175
Author(s): Elizabeth A. McGaw, Ph.D.; David W. Szymanski, Ph.D.; Ruth Waddell Smith, Ph.D.
Date Published: September 2009
Page Count: 5
Type: Report (Study/Research)
Format: Article
Language: English
Country: United States of America
Annotation: This study chemically characterized an undigested particulate that resulted when recycled document paper was microwave digested in a solution of HNO3 and H2O2 prior to analysis by inductively coupled plasma mass spectrometry (ICP-MS), and the effect of the particulate material on the elemental concentrations of the paper was then examined.
Abstract: Fourier transform infrared spectroscopy and X-ray diffraction spectroscopy determined that the particulate was a mixture of kaolin (clay) and TiO2. The presence of this particulate did not apparently have a significant effect on several element concentrations determined in the paper by ICP-MS (Mn, Zn, Se, Y, Ba, Ce, and Nd). This was determined by comparing the HNO3/H2O2 digestion (particulates present) with a hydrofluoric acid (HF) digestion in which no particulates were present. HNO3/H2O2 digestion is preferable to HF, even with particulates present, because HF is a very corrosive acid, is hazardous, and requires a larger paper sample and an additional evaporation step prior to ICP-MS analysis. Since the elemental concentrations determined by the use of HNO3/H2O2 digest were determined to be suitable for comparison, it is recommended as the preferred matrix for the microwave digestion of paper samples. 4 tables, 3 figures, and 13 references
Main Term(s): Criminology
Index Term(s): Document analysis; Forensic sciences; Investigative techniques; Paper analysis
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