Abstract
Qualitative analyses of trace elements in the glass for car lamps were performed by wavelength dispersive X-ray fluorescence analysis (WD-XRF) and synchrotron radiation X-ray fluorescence analysis (SR-XRF) for the discrimination of the car lamps. Glass samples were crushed into powder and a disc of the same shape prepared from the powder of each glass was used for WD-XRF and SR-XRF measurements under the same geometrical condition in order to make the comparison of the spectra more accurate. Comparison of peak intensities for elements (Fe, As, Sr, Zr, Sb, Ba and Pb) detected by WD-XRF was effective for the discrimination of the glasses. In SR-XRF, difference in the peak intensities of Fe, As, Sr, Zr and Pb was found in some of glass samples produced by a same manufacturer. Difference in the peak intensities for elements in glass samples was observed also in the elemental constitutions of glass samples for the same use. The differences in elemental constitution were observed also between the outer glass (bulb glass) and the inner glass (stem glass) within the same lamp. Both WD-XRF and SR-XRF are very powerful analytical techniques to discriminate glass of the car lamps. The constituent of elements obtained by these methods can provide information to some extent to assist in determining the manufacturer and specifications of the glass.
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