Analysis of variance in forensic glass analysis by ICP-MS: variance within the method

Duckworth, Douglas C.; Bayne, C.K.; Morton, Shelby J.; Almirall, José R.

doi:10.1039/a908813j

Cited by 43 publications

(31 citation statements)

References 16 publications

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“…A number of studies have reported that comparisons of elemental compositions are useful for the forensic discrimination of glass fragments, 5,6,8,9,12,[15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] and it is not pointed out again in this paper. What should be emphasized here is that a good correlation was observed in the elemental profiles between the non-heated and heated fragments in any of the 5 glasses.…”

Section: Comparison Of the Elemental Composition Between Heated And Nmentioning

confidence: 89%

“…[1][2][3][4][5][6] The forensic glass comparison mentioned above has been conducted by measuring the refractive index (RI) [5][6][7][8][9][10][11][12][13][14] and conducting an analysis of the elemental compositions using procedures such as X-ray fluorescence spectrometry (XRF), 6,8,12,[15][16][17][18][19][20][21][22] inductively coupled plasma atomic emission spectrometry (ICP-AES) 8,15,[23][24][25] and mass spectrometry (ICP-MS). 5,6,9,12,18,[26][27][28][29] An RI measurement can be applied to a glass fragment smaller than 0.1 mm in a maximum width without its destruction. This method has another advantage of simple sample preparation and short measurement time.…”

Section: Introductionmentioning

confidence: 99%

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Forensic Discrimination of Sheet Glass Exposed to High Temperature by the Determination of Trace Impurities Using ICP-MS

et al. 2008

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Section: Comparison Of the Elemental Composition Between Heated And Nmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Forensic Discrimination of Sheet Glass Exposed to High Temperature by the Determination of Trace Impurities Using ICP-MS

et al. 2008

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“…The Scientific Working Group on Materials Analysis (SWGMAT) has also issued a guide for applying SEM to forensic paint examinations [3]. SEM-EDS is capable of detecting elements present in concentrations greater than 0.1% [4], allowing for major and minor element qualitative concentration determinations, lacking the sensitivity for trace analysis [5]. X-ray fluorescence (XRF) is an additional tool available in some forensic laboratories but few published studies exist in the field of forensic paint analysis using the method [6,7], including a recent review [8].…”

Section: Introductionmentioning

confidence: 99%

“…Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) also has the ability to detect elements present in the paint matrix, but unlike SEM-EDS, the technique has the potential for trace elemental analysis.. Elemental profiling by ICP-MS has been shown to lead to excellent power of discrimination between glass fragments from different sources and to excellent power of association between fragments originating from the same source [5,9,10]. The use of the laser for solid-sampling introduction to the ICP-MS has gained wide acceptance and use as evidenced by the many recent publications [11,12,13,14,15,16] including a recent review chapter by Günther and Mermet [17].…”

Section: Introductionmentioning

confidence: 99%

Trace elemental analysis of automotive paints by laser ablation?inductively coupled plasma?mass spectrometry (LA?ICP?MS)

Hobbs

Almirall

2003

Analytical and Bioanalytical Chemistry

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Paints and coatings are frequently encountered as types of materials that are submitted to forensic science laboratories as a result of trace evidence transfers. The aim of this study was to develop a method to complement the commonly used techniques in a forensic laboratory in order to better characterize these samples for forensic purposes. A laser ablation method has been used to simultaneously sample several layers directly prior to introduction into an inductively coupled plasma-mass spectrometer for the detection and quantification of the trace metals present in the layer(s). Time-resolved analysis plots displaying the elemental response and quantification of selected metals are compared to associate/discriminate paint samples. Matrix-matched standards were successfully incorporated into the analysis scheme for quantification of lead in the solid paint samples. Preparation of new matrix-matched standards for quantification of additional elements developed for this study are also presented. A sample set of eighteen (18) survey automotive paint samples have been analyzed with the developed method in order to determine the utility of LA-ICP-MS for trace element analysis of paints.

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“…ICP methods benefit from features such as nearly simultaneous multielemental capability, reduced matrix interference effects, wide linear dynamic ranges, and excellent precision and sensitivity. These attributes result in superior discrimination power compared to other methods of glass analysis [MoenkeBlankenburg et al, 1992;, Wolnik et al, 1989, Zurhaar et al, 1990Parouchais et al, 1996;Duckworth et al, 2000].…”

Section: Forensic Examinations Of Glassmentioning

confidence: 99%

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.

show abstract

Analysis of variance in forensic glass analysis by ICP-MS: variance within the method

Cited by 43 publications

References 16 publications

Forensic Discrimination of Sheet Glass Exposed to High Temperature by the Determination of Trace Impurities Using ICP-MS

Forensic Discrimination of Sheet Glass Exposed to High Temperature by the Determination of Trace Impurities Using ICP-MS

Trace elemental analysis of automotive paints by laser ablation?inductively coupled plasma?mass spectrometry (LA?ICP?MS)

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

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