摘要:Ten samples of powder mixtures containing known quantities of methamphetamine·HCL and ephedrine·HCl were measured by X-ray diffraction. The respective I/IO values of 19 peales were selected for calibration. The data was used for the multivariate analyses including a cluster analysis, and a cluster analysis derived from the deviation and a principal component analysis. Subsequently the approximate values of the methamphetamine·HCl contents of unknown samples were determined from the 12×19 matrix. The accurate methamphetamine·HCl contents of unknown samples were calculated from the principal component score. Differences between the theoretical and calculated values of 10 samples ranged from -1.4 to 1.7% (the respective methamphetamine·HCl contents are 3.9, 14.5, 20.2, 34.4, 44.0, 49.8, 60.0, 75.2, 96.1 and 99.1%).