Analysis of glass fragment by laser ablation-inductively coupled plasma-mass spectrometry and principal component analysis

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Analysis of glass fragment by laser ablation-inductively coupled plasma-mass spectrometry and principal component analysis Bajic SJ, Aeschliman DB, Saetveit NJ, Baldwin DP, Houk RS
Download this paper for $25 PDF (73K) View License Agreement Source: JFS (August 2005)

Abstract
Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) is used to differentiate glass samples with similar optical and physical properties based on trace elemental composition. Laser ablation increases the number of elements that can be used for differentiation by eliminating problems commonly associated with dissolution and contamination. In this study, standard residential window and tempered glass samples that could not be differentiated by refractive index or density were successfully differentiated by LA-ICP-MS. The primary analysis approach used is Principal Component Analysis (PCA) of the complete mass spectrum. PCA, a multivariate analysis technique, provides rapid analysis of samples without time-consuming pair-wise comparison of calibrated analyses or prior knowledge of the elements present in the samples. Probabilities for positive association of the individual samples are derived from PCA. Utilization of the Q-statistic with PCA allowed us to distinguish all samples within the set to a certainty greater than the 99% confidence interval.

Keywords:
elemental analysis, forensic science, glass comparisons, principal component analysis
ISSN: 0022-1198
Paper ID: JFS2005088
DOI: 10.1520/JFS2005088

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Author Bajic SJ, Aeschliman DB, Saetveit NJ, Baldwin DP, Houk RS Title Analysis of glass fragment by laser ablation-inductively coupled plasma-mass spectrometry and principal component analysis Symposium , Committee on

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