Bl. Huang, LESS COMMONLY USED HYDRIDE GENERATION TECHNIQUES FOR ATOMIC SPECTROSCOPY - AN OVERVIEW, Canadian journal of applied spectroscopy, 39(5), 1994, pp. 117-122
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.