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Determination of traces of sodium and potassium in gallium arsenide by graphite furnace atomic absorption spectrometry and flame atomic emission spectrometry

E. Beinrohr, B. Síleš, J. Štefanec, and V. Rattay

Department of Analytical Chemistry, Faculty of Chemical Technology, Slovak Technical University, CS-81237 Bratislava

 

Abstract: Gallium arsenide samples were analyzed for traces of Na and K by graphite furnace atomic absorption spectrometry (GFAAS) and flame atomic emission spectrometry (FAES). The sample was dissolved in hydrochloric acid and bromine. For the GFAAS method the sample matrix need not be removed. The detection limit (3s) was found to be w = 10-8. For the FAES method the sample matrix was extracted as chlorides with butyl acetate or tributyl phosphate. The detection limit was w = 3 x 10-8. The reproducibility of the results was 3-5% (GFAAS) and 5-10% (FAES), respectively.

Full paper in Portable Document Format: 451a61.pdf

 

Chemical Papers 45 (1) 61–68 (1991)

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