Selenium determination by HG-ICPAES: Elimination of iron interferences by means of an ion-exchange resin in a continuous flow system |
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Authors: | L D Martinez M Baucells E Pelfort M Roura R Olsina |
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Institution: | Area de Qu′mica Anal′tica, Facultad de Qu′mica, Bioqu′mica y Farmacia, Universidad Nacional de San Luis, Chacabuco y Pedernera, 5700-San Luis, Argentina, AR Serveis Cientifico-Tècnics, Universitat de Barcelona, Lluis Sole i Sabari′s 1-3, E-08028 Barcelona, Spain, ES
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Abstract: | An accurate procedure for the elimination of iron interferences in the determination of selenium in geological materials
by the Hydride Generation – Inductively Coupled Plasma Atomic Emission Spectrometry technique (HG-ICPAES) is proposed. A selective
removal of iron is achieved by on-line incorporation of a microcolumn filled with strongly acidic cation exchange resin (Dowex
50W-X8). The microcolumn manifold used was interfaced with the hydride generation manifold by a flow injection sample injection
valve. After the removal of the iron, a 500 μl sample was injected into a carrier stream of water. This was merged with hydrochloric
acid and sodium tetrahydroborate in order to generate the corresponding selenium hydride. The system was found to have a limit
of detection of 0.4 ng ml-1 and a relative standard deviation of 2% for 20 ng ml-1 selenium. The application of the method on different Geochemical Standard Reference Samples demonstrated that results were
statistically indistinguishable from certified values.
Received: 7 March 1996 / Revised: 30 May 1996 / Accepted: 4 June 1996 |
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