Establishing a match criterion in forensic comparison analysis of float glass using laser ablation inductively coupled plasma mass spectrometry

Weis, Peter; Dücking, Marc; Watzke, Peter; Menges, Sonja; Becker, Stefan

doi:10.1039/c0ja00168f

Cited by 56 publications

(59 citation statements)

References 28 publications

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“…These match criteria still allow detection of significant differences between samples manufactured in the same plant over short time intervals, even for samples with quite similar elemental profiles. The performance of these match criteria is in agreement with recent published data [Weis et al, 2011]. As with µ-XRF methods, the time interval over which samples cannot be distinguished depends upon the variability of the formulation of the glass within a plant.…”

Section: Homogeneity Study: Pilkington and Cardinal Plantssupporting

confidence: 79%

“…Becker et al [Becker et al, 2011], where the discrimination potential of different techniques such as SEM-EDX, µ-XRF, and ICP-MS was described. However, the work did not include comparisons to laser-based methods.…”

Section: Forensic Examinations Of Glassmentioning

confidence: 99%

“…A recent study published by the Bundeskriminalamt/Federal Criminal Police Office, Forensic Science Institute [Weis et al, 2011] reported that wider match criteria are recommended for LA-ICP-MS measurements of glass due to the excellent precision between replicates. The authors conducted an extensive study on the elemental variability of 34 glass fragments that originated from the same glass sheets and found that tight match criteria, such as the t-test, produced high rates of false exclusions.…”

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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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Section: Homogeneity Study: Pilkington and Cardinal Plantssupporting

confidence: 79%

Section: Forensic Examinations Of Glassmentioning

confidence: 99%

mentioning

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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“…The elements selected were adapted from a list of previously reported element menus that have been used for the discrimination of glass 94,[107][108][109]116,120,126,127 . The element menu presented here within this work was chosen on the basis of sensitivity, presence of minimal interferences and the ability to achieve acceptable linear dynamic range for the application being evaluated.…”

Section: Element Menumentioning

confidence: 99%

“…In addition to the above fixed match criteria, a modified 4σ using a fixed relative standard deviation (3%) 126 was also included in the statistical analysis. The approach uses an established level of precision (3%) and adjusts analytes that yield smaller RSDs to a minimum of 3% RSD (or the actual RSD value, if greater).…”

Section: Discrimination Techniquesmentioning

confidence: 99%

Geographic Provenancing of Unprocessed Cotton Using Elemental Analysis and Stable Isotope Ratios

Schenk¹

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Mass Spectrometry Applications in Forensic Science

Smith

Tran

2019

Encyclopedia of Analytical Chemistry

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Mass spectrometry (MS) is a technique widely used in forensic science for the identification of molecular or elemental composition of submitted evidence. Relatively small, volatile, nonpolar molecules, such as ignitable liquids and some drugs, can be analyzed with electron and chemical ionization (CI) coupled with single‐stage mass analyzers that provide molecular weight and structural information. Nonvolatile and polar molecules such as other drugs, poisons, and/or their metabolites can be identified using electrospray or related soft ionization techniques. The use of tandem MS with these compounds allows structure elucidation and provides excellent screening and quantitative results. Ambient ionization sources allow sampling directly from a surface with minimal sample preparation required. Elemental profiles also provide reliable methods for distinguishing between forensic samples. This article aims to provide an overview of the MS instrumentation, techniques, and applications within the field of forensic science.

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Establishing a match criterion in forensic comparison analysis of float glass using laser ablation inductively coupled plasma mass spectrometry

Cited by 56 publications

References 28 publications

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

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

Geographic Provenancing of Unprocessed Cotton Using Elemental Analysis and Stable Isotope Ratios

Mass Spectrometry Applications in Forensic Science

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