讨论了在钛铁试剂活化下钒催化溴酸钾氧化甲基橙的最佳反应条件,建立了测定钒的新方法.在0.1mol·L-1H2SO4溶液中,506nm处监测反应,可测定0.1～100.0ng·mL-1范围的钒.方法检测下限可达30pg·mL-1,比文献方法提高了30余倍.用于铝合金及食品样中钒的测定,结果满意.%Conditions are described for improving the speed and sensitivity of a catalytic determination of vanadium.The reaction of methyl orange with potassium bromate using tiron as an activator at 0.1 mol·L-1 sulfuric acid and spectrophotometric measurement at 506 nm are recommended.Reagent concentration,reaction temperature and pH were studied in detail.The calibration curves are obtained over the range 0.1～100.0 ng·mL-1 of vanadium by fixed-time method and the detection limit was down to 30pg·mL-1,which was about 30 times better than the previous methods.The improved method was applied to determination of vanadium in aluminum alloy and food samples with satisfactory results.
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