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应用改进的磷钨酸光度法测定了样品中总钒和钒(Ⅳ)。在10%HCl介质中,一定体积的待测溶液中添加10%(V:V)H_3PO_4和20%(V:V)的Na_2WO_4·2H_2O(50 g/L)溶液,于30℃下显色30 min。方法的线性范围是0~30 mg/L,线性相关系数R~2=0.9992,相对标准偏差(n=12)为1.2%。并确定了天然水溶液中常见离子干扰钒测定的最大允许量。在此基础上,调节溶液的pH>4,测定V(Ⅳ)。改进后方法测V(Ⅳ)的线性范围为0~5 mg/L,相关系数R~2=0.9998。应用测定自来水和河水中V(Ⅳ)。
The total vanadium and vanadium (Ⅳ) in samples were determined by the improved phosphotungstic acid spectrophotometry. The solution of 10% (V: V) H_3PO_4 and 20% (V: V) Na_2WO_4 · 2H_2O (50 g / L) was added to a certain volume of test solution in 10% min. The linear range of the method was 0-30 mg / L with a linear correlation coefficient of R ~ 2 = 0.9992 and a relative standard deviation (n = 12) of 1.2%. The maximum allowable amount of vanadium detected by common ion interference in natural aqueous solution was determined. On this basis, adjust the solution pH> 4, the determination of V (Ⅳ). The linear range of V (Ⅳ) was 0 ~ 5 mg / L and the correlation coefficient R ~ 2 = 0.9998. Application Determination of tap water and river water V (Ⅳ).