催化荧光光度法测定痕量钼(Ⅵ)  被引量:4

Catalytic Fluorophotometric Determination of Molybdenum(Ⅵ) Based on Fluorescence Quenching Effect

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作  者:王丽红[1] 张辉[1] 李德玲[1] 张杨 李嫱[3] 李书存[3] 

机构地区:[1]河北唐山师范学院化学系,唐山063020 [2]唐山市滦县环境保护局,唐山063700 [3]燕山大学化学与环境工程系,秦皇岛066004

出  处:《理化检验(化学分册)》2009年第9期1072-1074,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘  要:基于在磷酸介质中,钼(Ⅵ)催化过氧化氢氧化碘化钾产生游离碘,并进一步与吖啶橙反应导致其荧光猝灭,据此提出荧光光度法测定痕量钼(Ⅵ)的一种灵敏的方法。采用固定时间法测得在446 nm(λ_(ex))及505 nm(λ_(em))波长处反应体系的△F(即F_0与F值之差)与钼(Ⅵ)的质量浓度在0.16~2.4μg·L^(-1)范围呈线性关系。方法的检出限(3s/k)为0.10μg·L^(-1)。该方法应用于绿豆、茶叶和矿泉水中钼的测定,测得方法的回收率在93%~99%之间,测定值的相对标准偏差(n=5)均小于5%。Based on the catalytic action of Mo(Ⅵ) on the oxidation of KI by H2O2 in dilute Ha PO4 medium to give free iodine (in form of I3^-) which in turn reacted with acridine orange leading to quenching of fluorescence of acridine orange, a fluorophotometric method for determination of Mo (Ⅵ) was proposed. Linear relationship was found between values of AF(F0--F) determined at wavelengths of 446 nm (λex) and 505 nm (λex) and concentration of Mo(Ⅵ) in the range of 0. 16--2. 4μg·L^-1. Limit of detection (3s/k) of the method found was 0. 10μg·L^-1. The proposed method was used in the determination of Mo(Ⅵ) in samples of green bean, tea and mineral water, giving values of recovery ranged from 93%--99%, and of RSD's (n=5) less than 5%.

关 键 词:荧光光度法 催化作用 钼(Ⅵ) 吖啶橙 荧光猝灭效应 

分 类 号:O657.31[理学—分析化学]

 

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