钛Ⅳ-邻氟苯基荧光酮-CTMAB-柠檬酸钠体系荧光猝灭法测定钛

Fluorescence quenching method for the determination of titanium with titanium Ⅳ-o-fluorophenylfluorone-CTMAB-sodium citrate system

在HCl介质中 ,钛 与邻氟苯基荧光酮 (o FPF)、溴化十六烷基三甲基铵 (CTMAB)和柠檬酸钠 (cit)反应产生一多元混合络合物 ,使邻氟苯基荧光酮溶液的荧光明显猝灭 ,据此建立了测定微量钛 的荧光分析新方法。该体系最大激发波长λex=3 65nm ,最大发射波长λem=5 65nm ,在 2 5mL溶液中 ,钛 在 0～ 3 0 μg范围内 ,荧光猝灭程度与钛 浓度成正比。本法简便 ,灵敏度高 ,选择性好 ,可用于钢样及人发样中微量钛 的测定 ,结果满意。

A highly sensitive fluorescence quenching method for the determination of titanium*＄based on the Ti*＄-o-FPF-CTMAB-sodium citrate system has been developed.In HCl medium,titanium*＄reacts with o-FPF,CTMAB and sodium citrate to form a non-fluorescent mixed complex and quenches the fluorescence intensity of o-FPF.The detection limit is 0.4μg/L.The linear range is 0-3.0μg/25mL.This method has been applied to the determination of trace titanium*＄in human hair and steel with satisfactory results.