A QUANTITATIVE-DETERMINATION OF OVERLAPPED CHROMATOGRAPHIC PEAKS OF DYSPROSIUM AND YTTRIUM USING TARGET TRANSFORMATION FACTOR-ANALYSIS

Rare earth elements (REE) were individual separated by applying the gr adient elution via HPLC using alpha-hydroxy isobutyric acid (HIBA) as an eluent. However, the overlap of Y and Dy peaks was too severe to ob tain the resolution of these two peaks. The target transformation fact or analysis (TTFA) was applied to resolve the elution peaks of Y and D y. [A]raw formed from the absorbances of mixed solution was factor ana lyzed. The abstract factor analysis (AFA) was used to determine the nu mber of components that contributed to the poorly resolved peaks. The error theory in the AFA showed that the number of components was 2. Th e test vectors which correspond to pure component were selected from t he standard solutions of Y and Dy. TTFA was accomplished by target tes ting. The results showed that the resolution of two peaks as well as t he determination of Y and Dy were possible by the factor analysis.