1996 Volume 45 Issue 11 Pages 1063-1064
Multivariate analyses (quantification IV, cluster analysis and principal component analysis) were applied to some signals obtained from the X-ray diffraction method, the spectrophotometric method, Fourier transform infrared spectroscopy and gas chromatography. The reproducibility and accuracy of an analysis of the desired components in binary and ternary systems were investigated. Multivariate analyses are particularly useful, because in forensic science the amount of sample is usually too small to measure repeatedly. In the conventional calibration method, one peak in one sample was generally used for the determination, and the peak for the determination was arbitrarily selected by the analyst. In this method, many peaks in one sample were selected according to a definite rule, and were used for the determination by multivariate analyses. By this method, the analysis of inorganic and organic substances could be accomplished with a high degree of reproducibility and accuracy.
