[Target transformation factor analysis for simultaneous determination of Fe3+ and Al3+ in rare earth samples]

Combined with chromazurol-S-CTMAB-acetone high sensitive system, iterative target transformation factor analysis (IT-TFA) is used to determine simultaneously the trace amount of Fe3+, Al3+ in synthetic samples and rare earth samples. Abstract factor analysis (AFA), the first stop in the method, decomposes the data matrix into abstract factors. The number of factors needed to account for the data to within experimental error is equal to the number of absorbing components in unknown samples. Having determined the number of factors, target factor analysis (TFA) is used to identify the presence of suspected components contributing to unknowns samples. The identification process involves using the normal projection matrix of row vectors to target test for suspected factors with similar coefficient (Q) as target test criterion. The normal projection matrix of column vectors is used to predict the concentration in unknown samples. The results indicate that the recoveries and accuracy are satisfactory.