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KMID : 0385520090220030235
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Analytical Science & Technology
2009 Volume.22 No. 3 p.235 ~ p.246
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Trace element analysis of korean car windshield using LA-ICP-MS
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Min Ji-Sook
Choi Man-Sik
Heo Sang-Cheol
Kim Jae-Guin
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Abstract
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The analyses of minor and trace elements in glass debris were performed using LA-ICP-MS in order to identify manufacturers using real commercial samples. At first, a calibration curve was made using standard glass samples of NIST 610, 612, 614 and 616. 29Si was used as an internal standard, and the ratios of metal/Si for each metal were compared with their concentrations. Based on elements in each sample and standard materials, 24 metals were quantified and the LOD in analysis, according to the blank sample, was in the range of 0.11 ㎎/㎏ (Ti)-4.91 ㎎/㎏ (Ca). Eleven samples from two manufacturers were collected and five sub-samples were taken from each sample for analysis. 15 elements (Co, Ce, Ca, Mn, Sr, Ba, Li, Rb, U, La, Th, Na, Al, Zr and Hf) were selected to identify manufacturers because some elements (Cu, Cr, Cd and Ni) were below the detection limit and some elements (Ti, Pr, Mg, Nb, Nd) were absent in the analysis of standards and others (Pb and Sn) had a problem of homogeneity. The attempts to identify manufacturers and the manufacturing period were performed through a triangular diagram. In the manufacturer discrimination by discriminant analysis, a canonical discriminant function was made based on Mn, Ce and Rb, and each sample could be identified.
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KEYWORD
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LA-ICP/MS, glass, forensic chemistry, discriminantion, element
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