在线流动注射液-液萃取非水介质汞还原原子荧光光谱法的研究及应用

Study and Application of Flow Injection Liquid-liquid Extraction Non-aqueous Media Mercury Reduction Atomic Fluorescence Spectrometry

提出了一种流动注射在线液 液萃取有机相汞还原原子荧光光谱法测定汞的新方法。该法以KI +HNO3 +(NH2 ) 2 CS/TBP为萃取体系 ,将汞萃取到有机相中 ,汞还原反应是在金属络合萃取液与含NaBH4的N ,N 二甲基甲酰铵 (DMF)溶液和冰乙酸中发生。应用流动注射技术实现了液 液萃取非水介质汞还原反应原子荧光测定的在线分析。研究了反应的最佳条件和流动注射流路及运行程序。该法提高了测定灵敏度并消除了干扰。

A new method for on-line solvent extraction covalent hydride generation in a non-aqueous media was proposed. Flow injection techniques were used to develop an efficient on-line solvent extraction pre-concentration and pre-separation system. The hydride generation is carried out in an aliquot of metal-complex extraction solution by sodium tetrahydroborate(III) in N, N-dimethyl formamide solution and anhydrons acetic acid. Hg is extracted by KI + HNO3 + (NH2)(2) CS into TBP and hydride generation by proposed method. A improved u-type, gas-liguid separator was used. The working conditions and manifolds scheme of flow injection had been optimized. The method is applied to the determination of mercury in GSD-4 and GSD-6 geological reference materials with good accuracy and precision.