邻氨基酚萃取催化光度法测定痕量钒及其催化反应机理

研究了在ｐＨ３．５的弱酸性介质中，痕量钒（Ｖ）能催化溴酸钾氧化邻氨基酚的指示反应，用萃取平衡控制反应时间和水相中邻氨基酚的浓度及反应程度，通过测量４２４ｎｍ下有机相的吸光度，建立了萃取催化光度法测定钒的新方法，方法的线性范围为０．００１０～０．３０ｍｇ／Ｌ检出限为１．０×１０＾－６ｇ／Ｌ用于人发，煤和岩石中痕量钒的测定，结果满意，此外，还探讨了反应机理，建立了动力方程。

Determination of Trace Vanadium by Extraction Catalytic Spectrophotometry Using o -Aminophenol and Its Kinetic Reaction Mechanism

A new extraction catalytic - spectrophotometric method has been studied for the determination of trace vanadium, based on the vanadium(V ) catalyzed oxidation of o-aminophenol by potassium bromate in weak acidic medium at pH 3. 5. The reaction time, concentration of o-aminophenol in aqueous phase and degree of reaction are controlled by extraction equilibrium. The absorbance of organic phase is measured at 424 nm. The linear range of the method is 0.0010 - 0. 30 mg/L. The detection limit is 1 .0 x 10-6 g/L. The method has been applied to the determination of vanadium in human hair, coal and rock samples with satisfactory results. The reaction mechanism and the kinetic equation of extraction catalytic reaction were discussed