PRAXIS—combined μ-Raman and μ-XRF spectrometers in the examination of forensic samples

Ziȩba‐Palus, Janina; Borusiewicz, Rafał; Kunicki, Marcin

doi:10.1016/j.forsciint.2007.04.230

Cited by 72 publications

(52 citation statements)

References 22 publications

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“…At the same time focusing optics are, in combination with broadband X-ray sources, more and more commonly used in research laboratories to realize micro-XRF experiments. [22][23][24][25][26][27][28] A permanent laboratory-based setup offers the advantages of low costs and better accessibility and, thus, a more flexible preparation and scheduling of the measurements than at external synchrotron radiation facilities.…”

Section: Introductionmentioning

confidence: 99%

Laboratory-based micro-X-ray fluorescence setup using a von Hamos crystal spectrometer and a focused beam X-ray tube

Kayser

Błachucki

Dousse

et al. 2014

Review of Scientific Instruments

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The high-resolution von Hamos bent crystal spectrometer of the University of Fribourg was upgraded with a focused X-ray beam source with the aim of performing micro-sized X-ray fluorescence (XRF) measurements in the laboratory. The focused X-ray beam source integrates a collimating optics mounted on a low-power micro-spot X-ray tube and a focusing polycapillary half-lens placed in front of the sample. The performances of the setup were probed in terms of spatial and energy resolution. In particular, the fluorescence intensity and energy resolution of the von Hamos spectrometer equipped with the novel micro-focused X-ray source and a standard high-power water-cooled X-ray tube were compared. The XRF analysis capability of the new setup was assessed by measuring the dopant distribution within the core of Er-doped SiO 2 optical fibers.

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Section: Introductionmentioning

confidence: 99%

Laboratory-based micro-X-ray fluorescence setup using a von Hamos crystal spectrometer and a focused beam X-ray tube

Kayser

Błachucki

Dousse

et al. 2014

Review of Scientific Instruments

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“…The authors recognized that this method should be also complemented by elemental composition analysis such as XRF [Zieba-Palus et al, 2008].…”

Section: The Astm Standard Guide For Test Methods For Forensic Writinmentioning

confidence: 99%

“…The inorganic analysis of ink has been also reported in the literature and has shown its potential to improve the discrimination value of the evidence [Polk 1977;Ferrero 1999;Rozic et al, 2005;Malzer et al2004;Ouija et al 2005 Moreover, some limitations remain on the existing methods; such as: a) the sensitivity does not allow the detection of elements present at trace elements, [Polk 1977, Zieba-Palus et al, 2008 b) the depth of the x-ray penetration its not easily controlled by the operator and may affect the results, [Zieba-Palus et al, 2006, Zieba-Palus et al, 2008 c) the contribution of the paper and the ink can not be easily isolated, [Malzer et al, 2004, Zieba-Palus et al, 2006, d) the technique is not readily available in forensic laboratories [Grassi 2007, Oujja 2005, Melessanaki et al, 2001], f) the technique consumes large amount of sample which may not be available or acceptable in a particular case [Spence et al, 2000;Rozic et al, 2005;Maind et al, 2006;Maind et al, 2008] or g) the technique is mainly qualitative [Polk 1977, Ferrero 1999, Ouija 2005, Zieba-Palus et al, 2008.…”

Section: The Astm Standard Guide For Test Methods For Forensic Writinmentioning

confidence: 99%

“…As a result, other methods such as Raman spectroscopy [Zieba-Palus et al, 2006;Zieba-Palus et al, 2008], infrared spectroscopy [Zieba-Palus et al, 2008], XRF [Zieba-Palus et al, 2008], ion paring HPLC/ MS/MS and laser desorption mass spectrometry (LDI-MS) [Weyerman et al, 2010;Gallidabino et al, 2010;Weyerman et al, 2012] have been recently explored as alternative tools to cope with forensic comparisons of gel inks.…”

Section: Research Motivationmentioning

confidence: 99%

“…In contrast, using LA-ICP-MS, fibers from the paper are just partially removed from microscopic areas of approximately 200 by 500 µm (~14 μg), leaving the paper almost intact after the analysis . Moreover, quantitative analysis of the inks is feasible, which represents a benefit for document examinations where differences on elemental composition between ink and paper samples of different origin are rather quantitative than qualitative [Zieba-Palus et al, 2008].…”

Section: Paper Manufacturingmentioning

confidence: 99%

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Evaluation of the Evidential Value of the Elemental Composition of Glass, Ink and Paper by Laser-Based Micro-Spectrochemical Methods

Trejos¹

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DEDICATIONThis dissertation is dedicated to my family, especially to my husband and my mom who are my day-to-day inspiration. I have learned from you both how to be perseverant and keep believing in our dreams. I also dedicate this work to my lovely kids: Montserrat and Anthony, being your mom has been God's greatest gift and privilege. In the first part of this study, the analytical performance of LIBS and LA-ICP-MS methods was evaluated for paper, writing inks and printing inks. A total of 350 ink specimens were examined including black and blue gel inks, ballpoint inks, inkjets and toners originating from several manufacturing sources and/or batches. The paper collection set consisted of over 200 paper specimens originating from 20 different paper sources produced by 10 different plants.Micro-homogeneity studies show smaller variation of elemental compositions within a single source (i.e., sheet, pen or cartridge) than the observed variation between different sources (i.e., brands, types, batches). Significant and detectable differences in the elemental profile of the inks and paper were observed between samples originating from different sources (discrimination of 87 -100% of samples, depending on the sample set under investigation and the method applied). These results support the use of vii elemental analysis, using LA-ICP-MS and LIBS, for the examination of documents and provide additional discrimination to the currently used techniques in document examination.In the second part of this study, a direct comparison between four analytical methods (µ-XRF, solution-ICP-MS, LA-ICP-MS and LIBS) was conducted for glass analyses using interlaboratory studies. The data provided by 21 participants were used to assess the performance of the analytical methods in associating glass samples from the same source and differentiating different sources, as well as the use of different match criteria (confidence interval (±6s, ±5s, ±4s, ±3s, ±2s), modified confidence interval, t-test (sequential univariate, p=0.05 and p=0.01), t-test with Bonferroni correction (for multivariate comparisons), range overlap, and Hotelling's T 2 tests. Error rates (Type 1 and Type 2) are reported for the use of each of these match criteria and depend on the heterogeneity of the glass sources, the repeatability between analytical measurements, and the number of elements that were measured. The study provided recommendations for analytical performance-based parameters for µ-XRF and LA-ICP-MS as well as the best performing match criteria for both analytical techniques, which can be applied now by forensic glass examiners.

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X‐Ray Fluorescence in Forensic ScienceUpdate based on the original article by Claude Roux and Chris Lennard,Encyclopedia of Analytical Chemistry, © 2000, John Wiley & Sons, Ltd.

Roux

Taudte

Lennard

2013

Encyclopedia of Analytical Chemistry

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This article describes the applications of X‐ray fluorescence (XRF) as an analytical tool in forensic science, including its limitations and practical aspects. The use of XRF is specifically discussed for the analysis of materials of forensic interest such as metals, gunshot residues (GSRs), paint, glass, soil, fibers, plastic and general polymers, documents, and miscellaneous types of evidence. Developments such as biological tissues micro‐XRF, 3‐D micro‐XRF — an adaptation of micro‐XRF — and total XRF are also described. These specialized techniques have highly desirable characteristics for the elemental profiling of a wide range of forensic samples, and hence we can anticipate that they will find significant use in forensic laboratories in the future.

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PRAXIS—combined μ-Raman and μ-XRF spectrometers in the examination of forensic samples

Cited by 72 publications

References 22 publications

Laboratory-based micro-X-ray fluorescence setup using a von Hamos crystal spectrometer and a focused beam X-ray tube

Laboratory-based micro-X-ray fluorescence setup using a von Hamos crystal spectrometer and a focused beam X-ray tube

Evaluation of the Evidential Value of the Elemental Composition of Glass, Ink and Paper by Laser-Based Micro-Spectrochemical Methods

X‐Ray Fluorescence in Forensic ScienceUpdate based on the original article by Claude Roux and Chris Lennard,Encyclopedia of Analytical Chemistry, © 2000, John Wiley & Sons, Ltd.

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