摘要
研究了采用流动注射技术进行痕量钽的离子交换分离富集,在0.30mol/L HCl介质中,Ta(Ⅴ)与Cl-形成配阴离子,被离子交换树脂交换富集,用0.50mol/L HNO3-2.5%柠檬酸溶液洗脱,用偶氮氟胂-Ⅲ(FAsA-Ⅲ)分光光度法测定.有色配合物的最大吸收波长为650nm,钽的质量浓度在0～600μg/L范围内符合比尔定律,方法的检出限为1.1μg/L.经分离后,钽的测定灵敏度可提高数倍,大量共存离子不干扰钽的测定.该法已应用于石煤渣中痕量钽的测定,结果令人满意.
A flow injection method for the determination of trace tantalum by 2,7-dis（5-fluoro-2-arsenophenylazo）-1,8-dihydroxynaphthalene-3,6-disulfonic acid（ FAsA-Ⅲ ） spectrophotometry after separation and preconcentration with ion exchange was studled. In the medium of 0.30mol/L hydrochloric acid, Ta （ V ） reacts with Cl^- to form an anion complex which was then adsorbed on the column of alkali anion exchange resin. The anion complex was desorbed from the column with a solution of 0.50moL/L nitric acid-2.5 % citric acid and reacted with FAsA-Ⅲ to form a color complex for speetrophotometrie determination. The maximum absorption wavelength was 650nm. Beer＇ s law was obeyed in the concentration range of 0 - 600/zg/L for tantalum （ V ）, and the detection limit of the method was 1. 1μg/L.The sensitivity for the determination of tantalum could be increased several times, a lot of co-ions would not disturb the determination of tantalum after separation and preeoneentration. The method has been applied to the determination of trace tantalum in stone coal flag with satisfactory results.
出处
《化学试剂》
CAS
CSCD
北大核心
2005年第9期556-558,共3页
Chemical Reagents
关键词
流动注射
离子交换分离富集
分光光度法
偶氮氟胂-Ⅲ
钽
flow injectlon
ion exchange separation and preconcentration
spectrophotometry
fluoroarsenazo Ⅲ
tantalum
