混合线性分析-分光光度法同时测定微量锌、镉、汞  

Simultaneous Spectrophotometric Determination of Zinc, Cadmium and Mercury with Hybrid Linear Analysis

作　　者：王晓佳[1] 王保宁[1] 

机构地区：[1]中国科学院长春应用化学研究所,长春130022

出　　处：《分析化学》2001年第4期396-399,共4页Chinese Journal of Analytical Chemistry

摘　　要：提出了以２－（５－溴－２－吡啶偶氮）－５－二乙氨基酚为显色剂分光光度法同时测定锌、镉、汞的新方法。由于在可见区３种络合物的吸收光谱具有相似的特征和严重重叠，本文采用混合线性分析进行光谱分辨，各组分的纯光谱则用最小二乘法从校正集中求出。讨论了显色条件，波长选择，纯光谱的确定和吸光度加合性等因素对测定的影响。方法具有简单，快速，准确等优点。已成功地用于混合试样中锌、镉、汞的同时测定，并与同条件下偏最小二乘法的计算结果进行了对比。A new method for simultaneous spectrophotometric determination of Zn, Cd and Hg using 2-(5-Br-2-pyridylazo)-5-diethylaminophenol as the color developing reagent was proposed. The absorption spectra of these three complexes have similar features with severe overlap in visible spectral range. For resolving these spectra, hybrid linear analysis was used, and the pure spectrum of each component was obtained from the calibration mixtures by least squares method. The effects of reaction condition, selection of wavelengths, determination of pure spectrum and additivity of absorbances etc. on the determination were discussed. The proposed method offers the advantages of simple, rapid, and accuracy. It has been successfully applied to the simultaneous determination of Zn, Cd and Hg in synthetic sample. A comparison was also made with the partial least squares method.

关 键 词：混合线性分析 锌 镉 汞 同时测定 分光光度法 微量分析 

分 类 号：O657.3[理学—分析化学]