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Microcrystalline cellulose for the dispersive solid-phase microextraction and sensitive determination of chromium in waters using electrothermal atomic absorption spectrometry

Abstract

A small amount (5 mg) of microcrystalline cellulose dispersed in the water sample (10 mL) at pH close to neutrality retains chromium(III) ions. To obtain a complete separation and facilitate the recovery of the solid phase, Triton X-100 was added, and the mixture was heated to achieve cloud point extraction. After centrifuging and discarding the aqueous phase, the residue was treated with 0.1 mL of an ethanol:hydrogen peroxide mixture, and chromium was measured by electrothermal atomic absorption spectrometry. Since only chromium (III) is extracted in this way, speciation is feasible at low levels. The enrichment factor was 95, which resulted in a detection limit of 6 ng L-1 chromium. The relative standard deviation for the measurement in duplicate of five extractions of a 100 ngL-1 chromium solution was 5.1%. The reliability of the procedure was assessed by analyzing five water samples with a certified chromium content. Data for the speciation of these certified reference materials are also given.

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Publication details

The article was received on 25 Jun 2018, accepted on 11 Jul 2018 and first published on 11 Jul 2018


Article type: Paper
DOI: 10.1039/C8JA00215K
Citation: J. Anal. At. Spectrom., 2018, Accepted Manuscript
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    Microcrystalline cellulose for the dispersive solid-phase microextraction and sensitive determination of chromium in waters using electrothermal atomic absorption spectrometry

    I. Lopez-Garcia, J. J. Marin-Hernandez and M. Hernandez-Cordoba, J. Anal. At. Spectrom., 2018, Accepted Manuscript , DOI: 10.1039/C8JA00215K

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