【摘要】 基于pH 2.9的乙酸介质中,碘化钾和邻菲啰啉溶液存在下,钼(Ⅵ)对过氧化氢和4,4′-四甲基二氨基二苯甲烷之间的氧化还原反应有显著的催化作用,生成的蓝色不稳定产物在603 nm波长处有最大吸收,利用流动注射分析技术能精确地控制反应时间的特点,建立了流动注射-催化光度法测定不稳定反应中痕量钼(Ⅵ)的方法。在36次/h的分析速度下检出限为9.6×10-6g.L-1,线性范围在0.5 mg.L-1内。应用该方法测定了废水样中钼(Ⅵ),加标回收率在95.6%~103.2%之间。更多还原

【Abstract】 In an acetic acid medium of pH 2.9,and in the presence of KI and o-phenanthroline,the redox reaction between H2O2 and 4,4′-tetramethyldiaminodiphenylmethane was significantly catalyzed by Mo(Ⅵ),and an unstable blue product was formed having its absorption maximum at the wavelength of 603 nm.By applying flow-injection technique,absorbance of the unstable blue product was taken down at definite time intervals.Linear relationship between values of absorbance and concentration of Mo(Ⅵ) was kept in the range within 0.5 mg·L-1.Detection limit(3k/s) found for the method was 9.6×10-6g·L-1.The proposed method was applied to the determination of Mo(Ⅵ) in waste water,and results of recovery tested by standard addition method were in the range of 95.6%-103.2%.更多还原