【摘要】 基于在磷酸介质中 ,钒 (Ⅴ )对溴酸钾氧化吖啶黄具有催化作用 ,使体系荧光猝灭 ,建立了动力学荧光法测定痕量钒的新方法。方法的线性范围为 0 0 2～ 0 2 μg·L-1和 0 2～ 2 0 μg·L-1,检出限为 0 0 0 6 μg·L-1。将方法用于水样中钒含量的测定 ,结果满意。本实验还对反应机理进行了初步探讨。更多还原

【Abstract】 A new kinetic fluorimetric method has been proposed for the determination of trace vanadium.The method is based on the catalytic oxidation of acridine yellow with potassium bromate in a phosphoric acid medium.The fluorescence quenching of acridine yellow is determined by fixed time method.The optimal conditions of experimentation has been studied and chosen.The optimal reaction temperature is 100℃ in boiling water.The optimal reaction time is 8 minutes.Flowing cold water stops the reaction.The linear range of the determination are 0 02-0 2 μg·L -1 and 0 2-2 0 μg·L -1 V(Ⅴ).The detection limit for vandium is 0 006 μg·L -1 .The proposed method suffers no interference from more than 20 foreign ions.It has high sensitivity and selectivity.The method has been applied to determine trace vanadium in water samples with satisfactory results.更多还原