水杨基萤光酮荧光熄灭法测定微量钨

A Fluorescence Qenching Method for Determination of Trace Tungsten With Salicylfluorone and Cetyltrimethylammonium Bromide

本文用荧光熄灭法研究了水杨基荧光酮(SAF)-溴化十六烷基三甲胺(CTMAB)-W(VI)体系的测定方法及条件。在pH1.2～3.5的硫酸介质中,检测限为0.1μg/25ml,在0.1～2.5μg/25ml范围内具有线性关系。本法灵敏度高,选择性好,用于检测合金钢中钨,结果满意。

W(Ⅵ)in alloys was rapidly determined by fluorometric qenching method using salicy-lfluorone and cetyltrimethylammonium bromid(CTMAB)as reagent. In a strong acid medium, W(Ⅵ), salicylfluorone and CTMAB react to form a complex. lts maximal excitation wavelength is 500nm, and maximal emission wavelength is 520nm. The linear range is 0. 1～2. 5μg/25ml, the detection limit of W(Ⅵ)is 0. 1μg/25ml. The method is free from interferences when NH_2OH. HCl and EDTA were used commonly. So it has been applied to determine W(Ⅵ)in alloys with satisfactory results.