Analysis Of Glass Fragments Research Articles

W sprawie wytwórczości szklarskiej w celtyckim oppidum w Starym Hradisku na Morawach

Discussion presented in the article is based upon analysis of glass fragments from the late La Tene oppidum. Existence of the jewellery manufacture workshop in Stare Hradisko, producing bracelets and possibly also beads of dark-blue, dark-yellow and green glass of external origin, is speculated based upon chemical composition of 5 fragments as well as morphological analysis. Further complex studies are postulated, which will facilitate unequivocal testing of the speculation about existence of glass works in StareHradisko. Analysed samples revealed presence of the soda-calcium-aluminium-silicon as well as the soda-calcium-lead-aluminium-silicon glass.

Nondestructive discrimination of small glass fragments for forensic examination using high energy synchrotron radiation x-ray fluorescence spectrometry

This paper demonstrates that high-energy SR-XRF (synchrotron radiation x-ray fluorescence spectrometry) utilizing 116 keV x-rays is a powerful technique for nondestructive discrimination of small glass fragments. An XRF spectrum of glass fragments of a standard material SRM612 gave well-resolved K-line peaks of 34 elements, including the rare-earth elements. The relative standard deviations (RSD) of the ratios of the intensities of heavy elements normalized by that of Ba were less than 8.2% for the analyses of 10 fragments (<1 mg) in the energy region above 20 keV. A comparison of glass fragments (<1 mg) obtained from 26 figured glass sheet was performed using elemental intensity ratios that were defined as the intensities of detected elements divided by that of Ba. Analyses of glass fragments revealed the existence of Mo, Pd, Sb, Cs and Bi, and these trace elements could be useful as important indexes to discriminate glass samples. The Ce:Ba ratios could be measured for all the samples with precision of 1.9% and were found to be quite effective parameters for identification of glass fragments, even though these fragments would contain no other characteristic heavy elements. All glass fragments in this study that could not be distinguished on the basis of refractive index (RI) values could be discriminated by this method. Copyright © 2006 John Wiley & Sons, Ltd.

Analysis of Glass Fragments by Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry and Principal Component Analysis

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.

Characterisation of ancient and art nouveau glass samples by Pb isotopic analysis using laser ablation coupled to a magnetic sector field inductively coupled plasma mass spectrometer (LA-ICP-SF-MS)

LA-ICP-MS was applied for the characterization of historic glass samples by Pb isotope ratios. Laser and ICP-MS parameters were adjusted in order to obtain accurate data with minimum total combined uncertainty and minimum damage to the samples. Moreover, we evaluated mass discrimination correction procedures for these specific samples. No significant laser induced mass bias effects could be observed for glass samples by comparing LA-ICP-MS with pneumatic nebulisation ICP-MS. Iridescent Art Nouveau lead crystal glass samples were analyzed and it could be proved that the material of the single layers originates from different glass sources. The analysis of glass fragments from the archaeological site in Ephesos, Turkey, showed only a low concentration of Pb. Nevertheless, we achieved a successful differentiation of the investigated samples via the Pb isotope ratios whereas multi element pattern did not allow grouping of the data.

Sequential multi-element analysis of small fragments of glass by atomic-emission spectrometry using an inductively coupled radiofrequency argon plasma source

A method is described for the quantitative multi-element analysis of small fragments (200–500 µg) of glass using an inductively coupled radiofrequency argon plasma source. The glass samples are digested with a mixture of hydrofluoric and hydrochloric acids and chromium is added as an internal standard. An ultrasonic nebuliser is used in order to reduce to a minimum the volume of solution required for each analysis. A single monochromator and detection system is employed, and the wavelength regions of interest are examined sequentially by means of a specially constructed control unit. The results for aluminium, barium, iron, magnesium and manganese show that the analysis of glass fragments in the range 200–500 µg can be achieved with coefficients of variation of approximately 10%. Standard glasses were analysed to assess the accuracy of the method.