摘要
研究了荧光猝灭法测定痕量碲的方法。在 pH4.0的 NaAc-HAc 缓冲溶液中,水杨基荧光酮(SAF),氯化十四烷基吡啶(TPC)和碲(Te)形成无荧光的三元络合物,从而导致体系的荧光猝灭。在激发波长λex=494.1nm 和发射波长λem=527.5nm 时,碲(Ⅳ)含量在0～6μg/25ml 范围内,荧光猝灭程度和碲浓度成正比。方法的灵敏度高,用于测定硒和二氧化硒中碲的含量,结果令人满意。
A fluorescence quenching method for the determination of trace Te is reported.The method is based on the fluorescenoe quenching effect of salicylfluorone-tetradecanepyridinium chloride due to the formation of a nonfluorescent ternary complex,Te-SAF-TPC in NaAc-HAc buffer medium of pH4.0.The excitation and emission wavelengths are 494.1nm and 527.5nm,respectively.The linear relationship is obeyed in the range of 0-6μg/25ml for Te(Ⅳ).The method is highly sensi- tive and has been applied to the determination of Te in selenium and selenim dioxide with satisfactory results.
出处
《冶金分析》
CAS
CSCD
北大核心
1997年第3期18-20,共3页
Metallurgical Analysis
关键词
碲
SAF
TPC
荧光猝灭法
硒
二氧化硒
Tellurium
Salicylfluorone
Tetradecanepyridinium chloride
Fluorescence quenching
