Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 398, Issue 2, Pages 1043-1048Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-010-3950-y
Keywords
Chromium; Preconcentration; Aliquat 336; Activated carbon (AC); X-ray fluorescence
Funding
- Universidad Nacional de San Luis, Instituto de Quimica de San Luis (INQUISAL)
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET)
- Agencia Nacional de Promocion Cientifica y Tecnologica (FONCYT) (PICT-BID)
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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 mu g 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.
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