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Determination of trace amounts of copper and lead in gallium arsenide crystals by anodic stripping voltammetry with mercury drop semimicroelectrode

H. Hofbauerová, Š. Mesároš, D. Bustin, and E. Beinrohr

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

 

Abstract: Trace amounts of Pb and Cu were determined in gallium arsenide crystals by anodic stripping voltammetry on mercury drop electrode. Two types of electrodes were used: electrode of conventional dimension (r = 440 μm) and semimicroelectrode (r = 80 μm). The GaAs samples were dissolved in the mixture HCl—HN03r = 2:1) and analyzed. The detection limits of Cu and Pb for the macroelectrode were 13 ng cm-3 and 37 ng cm-3  , respectively, those for the semimicroelectrode were 6 ng cm-3  and 13 ng cm-3, respective­ly. The reproducibility of the results was about 10% for both types of electrodes. The accuracy of the results was checked by graphite furnace AAS.

Full paper in Portable Document Format: 445a643.pdf

 

Chemical Papers 44 (5) 643–649 (1990)

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