LESS COMMONLY USED HYDRIDE GENERATION TECHNIQUES FOR ATOMIC SPECTROSCOPY - AN OVERVIEW

Authors
Citation
Bl. Huang, LESS COMMONLY USED HYDRIDE GENERATION TECHNIQUES FOR ATOMIC SPECTROSCOPY - AN OVERVIEW, Canadian journal of applied spectroscopy, 39(5), 1994, pp. 117-122
Citations number
32
Categorie Soggetti
Spectroscopy
ISSN journal
11837306
Volume
39
Issue
5
Year of publication
1994
Pages
117 - 122
Database
ISI
SICI code
1183-7306(1994)39:5<117:LCUHGT>2.0.ZU;2-N
Abstract
Some less commonly used hydride generation (HG) techniques for atomic spectroscopy developed in the author's laboratories are overviewed in this article. For the simultaneous determination of both hydride formi ng and non-hydride forming elements by ICP-AES, a nebulizer-hydride ge nerator system has been developed. In this system, large droplets from a concentric nebulizer are trapped and react with borohydride solutio n pumped into a small hydride generator fitted in the spray chamber. T he hydrides formed and sample aerosol go into the plasma simultaneousl y, while the non-volatile reaction products and surplus reductant flow to the drain. This system provides more than 20-fold improvements in detection limits for the hydride forming elements without degrading th e performance for other elements. A modification of the system was sub sequently made to yield a smoother hydride formation reaction. Hydride generation (HG) in non-aqueous media affords the possibility of combi ning HG directly with solvent extraction; its application to the deter mination of As and Sb in Ni-Fe alloy has been studied. A flow injectio n-electrochemical HG technique for AAS and ICP-AES studies has been de veloped. This technique alleviates the use of borohydride and its shor tcomings. Although it has aroused attention from several countries, th e method is still in its infancy.