多波长线性回归分光光度法的应用研究Ⅰ——钼(Ⅵ)和钨(Ⅵ)两组分体系的同时测定

STUDIES ON THE APPLICATION OF LINEAR REGRESSION ANALYSIS IN MULTIWAVELENGTH SPECTROPHOTOMETRY Ⅰ . SIMULTANEOUS DETERMINATION OF MOLYBDENUM (Ⅵ) AND TUNGSTEN (Ⅵ)

在研究Mo(Ⅵ)、W(Ⅵ)与Tiron显色反应的基础上,用多波长数据线性回归分光光度法处理Mo(Ⅵ)、W(Ⅵ)两组分混合体系,选取了波长范围为310～370nm间的12个波长点进行测定。结果表明,当Mo:W为4:10～10:1时,回归相关系数r≥0.996,回收率为97～103％,回归线相对波动除1:10时约为12％外,其余均≤5.5％,结果具有较好的精密度和准确度。

The linear regression analysis for multiwavelength data was applied to determine simultaneously two usual mutual interfering components Mo(VI) and W(VI). Mo(VI) and W(VI) complexes were formed with Tiron in HAc-NaAc medium (pH=4.5),which can be used to determine Mo(VI) and W(VI) by UV-spectrophotometry at multiwavelengths. The absorbance of the mixture was measured at 12 wavelengths over the range 310～370nm. The linear correlation coefficients(r) are found to be ≥0.996 in the standard mixtures containing Mo(VI) and W(VI) with the concentration ration being from 4:10 to 10:1. The recoveries of both elements are 97～103%. The method has been successfully used for direct determination of Mo(VI) and W(VI) in the heteropolycomplex samples.