流动注射化学发光法测定痕量钒(Ⅴ)

Flow-injection chemiluminescence determination of Vanadium (Ⅴ)

基于在硫酸介质中钒(Ⅴ)与磷钼酸形成具有更强氧化性的磷钼钒杂多酸(HPA),而磷钼钒杂多酸可直接氧化碱性鲁米诺产生强的化学发光,并结合流动注射分析技术,建立了一种测定痕量钒的新方法.其线性范围为5 0×10-9～1 0×10-5g/mL,方法的检出限为1 0×10-9g/mL.测定2 0×10-7g/mL的钒,11次连续测定的相对标准偏差为2.2%.方法已用于水样中痕量钒的测定.

A novel chemiluminescence (CL)system for the determination of Vanadium (Ⅴ) is described. It is based on that Vanadium (Ⅴ) and molybdophosphate in sulfuric acid medium could form vanadomolybdophosphoric heteropoly acid, which could oxidize luminol to produce CL emission. The linear range of calibration curve is 5×10-9～ 1×10-5g/mL and the determination limit is 1×10-9g/mL. The system has been applied to the determination of Vanadium (Ⅴ) in water samples with satisfactory results.