迭代目标转换因子分析光度法同时测定钐铕钆富集物中的铁和铝

Target Transformation Factor Analysis for Simultaneous Determination of Fe^(3+) and Al^(3+) in Rare Earth Samples

基于铬天青S CTMAB与Fe3 +、Al3+离子的显色体系中两组分吸收光谱灵敏度高及选择性差的特点 ,采用迭代目标转换因子分析法处理数据。首先根据主因子分析对未知样品进行组分数估计 ,然后构造列空间正交投影矩阵 ,以体系中可能存在组分的光谱向量为待检验光谱 ,确定试样的真实组成从而完成定性分析。然后以构成的行空间正交投影矩阵对浓度矩阵进行迭代运算而完成定量分析。

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.