[Study and application of flow injection liquid-liquid extraction non-aqueous media mercury reduction atomic fluorescence spectrometry].
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)2CS 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.
Guo
Xin
X
National Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China.
Jin
Ze-xiang
ZX
Tang
Zhi-yong
ZY
D001894:Borohydrides / Q000737:chemistry; D017022:Flow Injection Analysis; D008628:Mercury / Q000032:analysis*; D010084:Oxidation-Reduction; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence / Q000295:instrumentation / Q000379:methods*; D013054:Spectrophotometry, Atomic / Q000379:methods
D001894:Borohydrides; C025364:sodium borohydride; D008628:Mercury