Journal
MICROCHIMICA ACTA
Volume 179, Issue 3-4, Pages 235-239Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-012-0887-1
Keywords
Chromium; Preconcentration; Aliquat 336; Nanotubes; Thin film; X-ray fluorescence
Categories
Funding
- San Luis National University (UNSL)
- San Luis Chemistry Institute (INQUISAL)
- National Council of Scientific and Technical Research (CONICET)
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We report on a novel and selective method for the preconcentration and determination of Cr(VI) in aqueous samples. Cr(VI) is adsorbed - in a batch mode - on multiwalled carbon nanotubes covered with Aliquat 336 and then determined directly, i.e., on the solid, by X-ray fluorescence spectrometry. This reduces the number of reagents and minimizes sample handling. The method combines the advantages of solid-phase extraction with the benefits of the XRF method in that the large areas required by the carbon nanotubes make them a promising solid sorbent for preconcentration. The enrichment factor was calculated after considering that the thin film obtained from the 10 mL solution of 1 mg L-1 of Cr(VI) has a real thickness of 0.04 mm and a final diameter of 16.7 mm, so that the volume deposited on the pellet is 0.0088 cm(3) and the preconcentration factor is 1000.
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