Preconcentration and Determination of Chromium Species Using Octadecyl Silica Membrane Disks and Flame Atomic Absorption Spectrometry
Department of Chemistry, Faculty of Science, Science and Research Campus Islamic Azad University, Tehran (Iran)
DOI : http://dx.doi.org/10.13005/msri/030206
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A novel and selective method for the fast determination of trace amounts of chromium species in water samples has been developed. The procedure is based on the selective formation of chromium diethyldithiocarbamate complexes at different pH in the presence of Mn(II) as an enhancement agent of chromium signals followed by elution with organic eluents and determination by atomic absorption spectrometry. The maximum capacity of the employed disks was found to be 396 ± 3 μg and 376 ± 2 μg for Cr(III) and Cr(VI), respectively. The detection limit of the proposed method is 49 and 43 ng.L-1 for Cr(III) and Cr(VI), respectively. The proposed method was successfully applied for determination of Cr(III) and Cr(VI) in different water samples.
KEYWORDS:Solid phase extraction; Sodium diethyldithiocarbamate; Flame atomic absorption spectrometry
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581 Accepted on: 15 Dec 2005
