铀矿冶2001，Vol.20Issue(2)：120-125,6.
钽反萃取液中微量铌的自动测定——流动注射-树脂在线分离-分光光度法
FLOW INJECTION-ON LINE RESIN SEPARATIONSPECTROPHOTOMETRIC METHOD FOR DETERMINATION OF TRACE NIOBIUM IN THE PRESENCE OF A GREAT QUANTITY OF TANTALUM
摘要
Abstract
A new and highly sensitive method bas been developed for determination of trace niobium in the presence of a great quantity of tantalum， the amount(10 μL) of sample necessary for the flow injection analysis is used. In 1 mol/L HCl+10 g/L HF medium as exchange solution,a great quantity of Ta is adsorbed on the miniature column with anion exchange resin and trace Nb is removed. The effluent containing Nb mixes and reacts with sulphichlorophenol S in the presence of complexing agents, and then the absorbance of the multicomponent complex is measured at 620 nm and 38℃ after 5 min of stopped-flow. The determination range of Nb2O5 is 0.005～0.05 g/L. The RSD of the method is±6.1%. The recovery of Nb is 90%～110%. The determination speed is about 10 samples per h.关键词
铌/流动注射分析/分光光度法分类
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余忆云..钽反萃取液中微量铌的自动测定——流动注射-树脂在线分离-分光光度法[J].铀矿冶,2001,20(2):120-125,6.
