摘要
在盐酸介质中Cr(Ⅵ )与间硝基苯基荧光酮 (m NPF) ,辛基苯基聚氧乙烯醚 (TX 10 )和柠檬酸钠反应形成一多元混配配合物 ,使间硝基苯基荧光酮溶液的荧光显著熄灭 ,据此建立了测定微量Cr(Ⅵ )的荧光熄灭新方法。该体系的λex=36 5nm ,λem=5 37nm ,Cr(Ⅵ )的浓度在 0～ 8 0 μg/ 2 5mL范围内与荧光熄灭值ΔF呈良好线性关系 ,方法检出限为 1 0 μg/L。该方法灵敏、准确 ,用于水样中Cr(Ⅵ )的直接测定 。
A highly sensitive fluorescence quenching method for the determination of chromium(Ⅵ) based on the system of Cr(Ⅵ) m nitrophenylfluorone( m NPF) octylphenylpolyoxyvinyl ether(TX 10) sodium citrate has been developed.In HCl medium,chromium(Ⅵ) reacts with m NPF,TX 10 and sodium citrate to form a non fluorescent mixed complex and quenches the fluorescence intensity of m NPF.The excitation and emission wavelengths are 365 and 537 nm,respectively.The linear relationship is obeyed in the range of 0～8 0 μg/25mL for Cr(Ⅵ). The detection limit for Cr(Ⅵ) is 1 0 μg/L.The method has been applied to the determination of trace chromium(Ⅵ) in water samples with satisfactory results.
出处
《化学试剂》
CAS
CSCD
北大核心
2003年第3期150-151,168,共3页
Chemical Reagents
基金
陕西省教委专项科研基金资助课题 ( 99JK12 4)
