多波长线性回归分光光度法的应用研究Ⅱ一钼（Ⅵ）和钒（Ⅴ）两组分体系的同时测定

STUDIES ON THE APPLICATION OF LINEAR REGRESSIONANALYSIS IN MULTIWAVELENGTH SPECTROPHOTOMETRY──Ⅱ. SIMULTANEOUS DETERMINATION OFMOLYBDENUM(Ⅵ ) AND VANADIUM(Ⅴ )

在研究了Ｍｏ（Ⅵ）、钒（Ⅴ）与Ｔｉｒｏｎ显色反应的基础上，借多波长数据线性回归方法处理了最大吸收峰仅差７ｎｍ的钼（Ⅵ）、钒（Ⅴ）两组分体系。选取了波长区间为２９８～３８０ｎｍ间的１６个波长点进行测定。结果表明，当ＭＯ：Ｖ为２：１０～１０：２时，回归相关系数γ≥０．９９８６，回归线相对波动≤７．７％，用于含钼钒杂多酸盐样品的分析，取得较好结果。对Ｍｏ和Ｖ的回收率分别为９５％￣１０５％和９７．５％～１１０％。

The linear regression analysis for multiwavelength data was applied to simultaneous determination of two usual interfering components Mo (Ⅵ ) and V (Ⅴ ). Mo(Ⅵ ) and V(Ⅴ ) complexeswere formed with Tiron in HAc-NaAc (pH = 4. 5) medium, which could be used to determine Mo(Ⅵ ) and V(Ⅴ ) with multiwavelength spectrophotometry. The absorbances of the mixture solutionwere measured at 16 wavelengths over the range of 298nm to 380nm. The linear correlation coefficients(r) are found to be ≥0. 9986 in the standard mixtures containing Mo(Ⅵ ) and V(Ⅴ ) with themolar ratio being from 2: 10 to 10: 2. The recovery rates of Mo(Ⅵ ) and V(Ⅴ ) are 95 % ￣ 105and 97. 5% - 110%, respectively. The method has been used to directly determine Mo(Ⅵ ) and V(Ⅴ ) in the heteropoly compound samples with satisfactory results.