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Updated: Jun 10, 2026
Fabrication of a Dipole-assisted Solid Phase Extraction Microchip for Trace Metal Analysis in Water Samples
Published on: August 7, 2016
Determination of trace chromium(VI) in drinking water using X-ray fluorescence spectrometry after solid-phase
Pedro R Aranda1, Susana Moyano, Luis D Martinez
1Area de Química Analítica, Instituto de Química de San Luis (INQUISAL-CONICET), Universidad Nacional de San Luis, Facultad de Química, Bioquímica y Farmacia, Chacabuco y Pedernera, D5700BWS, San Luis, Argentina.
Abstract:
A new, simple, and selective method for preconcentration and determination of Cr(VI) in aqueous samples. After adsorption in "batch mode" on Aliquat 336-AC, determinations were made directly on the solid by X-ray fluorescence spectrometry, which had the advantage of not requiring the step of elution of the chromium retained. The enrichment factor was calculated considering that the tablets obtained from 10 mL solution of Cr(VI) (1000 μg L(-1)) had a final thickness of 0.64 mm and a diameter of 16.7 mm; the volume deposited on the pellet was 0.14 cm(3). The preconcentration factor obtained was 71-fold, which was highly satisfactory for chromium trace analysis by XRF. Finally, the method was successfully applied to the determination of Cr(VI) in drinking water samples.
