流动注射-催化光度法测定不稳定反应中钼  

FI-Catalytic Photometric Determination of Molybdenum in an Unstable Reaction System

作　　者：苏苓[1] 张海涛[1] 

机构地区：[1]徐州建筑职业技术学院,徐州221008

出　　处：《理化检验（化学分册）》2009年第7期844-846,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：江苏省"青蓝工程"骨干教师科研基金资助项目(90250886700155);徐州建筑职业技术学院科研基金资助项目(JYA3-07)

摘　　要：基于pH2．9的乙酸介质中，碘化钾和邻菲口罗啉溶液存在下，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603nm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9．6×10μg·L^-1，线性范围在0．5mg·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.In an acetic acid medium of pH 2. 9, and in the presence of KI and o-phenanthroline, the redox reaction between H2 02 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^-6 g · 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%.

关 键 词：流动注射-催化光度法 钼(Ⅵ) 不稳定反应 废水样 

分 类 号：O657.32[理学—分析化学]