间氟苯基荧光酮-十六烷基三甲基溴化铵荧光熄灭法测定微量铬(Ⅵ)

Study on Fluorescence Quenching Method for Determination of Trace Chromium(Ⅵ) with m Fluorophenylfluorone Cetyltrimethyl Ammonium Bromide System

研究了荧光熄灭法测定微量铬的新方法。在 0 .0 1 6～ 0 .1 mol·L- 1的盐酸溶液中 ,间氟苯基荧光酮 ( m- FPF)、十六烷基三甲基溴化铵 ( CTMAB)和铬( )可形成无荧光的三元配合物 ,从而导致体系的荧光熄灭。在激发波长λex=365nm,发射波长λem=532 nm时 ,铬含量在 0～ 3.0μg/ 2 5m L范围内 ,荧光熄灭程度和铬浓度成正比。方法检出限为 1 .2 μg/ L,可用于水样中微量铬的测定。

A simple and highly sensitive fluorescence quenching method for determination of trace chromium(Ⅵ) with m fluorophenylfluorone( m FPF) cetyltrimethyl ammonium bromide(CTMAB) system is reported. The detection limit is 1.2 μg/L. The linear range is 0～3 0 μg/25 mL . This method was applied to the determination of trace chromium(Ⅵ) in water samples with satisfactory results.