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Preconcentration and speciation of chromium species using ICP-OES after ultrasound-assisted magnetic solid phase extraction with an amino-modified magnetic nanocomposite prepared from Fe3O4, MnO2 and Al2O3

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Abstract

The article describes a method for preconcentration and speciation of Cr(III) and Cr(VI) in river waters. It is based on ultrasound-assisted magnetic solid phase extraction employing a nanocomposite prepared from magnetite nanoparticles, manganese oxide and alumina oxide, and then functionalized with [3-(2-aminoethylamino)propyl] trimethoxysilane (AAPTMS). By taking advantage of the oxidative properties of MnO2, the Fe3O4@MnO2,Al2O3 nanocomposite was used for the preconcentration of total chromium. The AAPTMS-modified nanocomposite, in turn, is selective for Cr(VI). The concentration of Cr(III) can be calculated as the difference between total chromium and Cr(VI). The preconcentrated chromium species were quantified using ICP-OES. The method was optimized using response surface methodology. Under optimal conditions, the limit of detection and quantification are 20 and 50 pg ⋅ mL−1, respectively. The intraday and interday precisions of the method, expressed in terms of relative standard deviation, are 2.6 and 4.9%, respectively. In addition, the effects of potentially interfering ions were examined. The method was successfully applied to the speciation of chromium in spiked river water and a certified reference material.

The magnetic Fe3O4@MnO2,Al2O3 was used as an adsorbent for preconcentration of total chromium in aqueous samples, while Fe3O4@MnO2,Al2O3 modified with [3-(2-aminoethylamino)propyl] trimethoxysilane (AAPTMS) was used for speciation of Cr(VI). The concentrations of Cr(III) was calculated from total Cr and Cr(VI).

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Acknowledgements

This work was financially sponsored by the Department of Science and Technology (DST, South Africa) / National Nanoscience Postgraduate Teaching and Training Programme (NNPTTP) and the authors wish to thank the University of Johannesburg (UJ) for providing their laboratory facilities. The physics department of the University of Johannesburg is kindly acknowledged for assistance with their vibrating sample magnetometer (VSM) instrument.

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Authors and Affiliations

  1. Department of Applied Chemistry, University of Johannesburg, Doornfontein Campus, P.O. Box 17011, Johannesburg, 2028, South Africa

    Tshimangadzo S. Munonde, Nobanathi W. Maxakato & Philiswa N. Nomngongo

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  1. Tshimangadzo S. Munonde
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  2. Nobanathi W. Maxakato
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  3. Philiswa N. Nomngongo
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Correspondence to Philiswa N. Nomngongo.

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Munonde, T.S., Maxakato, N.W. & Nomngongo, P.N. Preconcentration and speciation of chromium species using ICP-OES after ultrasound-assisted magnetic solid phase extraction with an amino-modified magnetic nanocomposite prepared from Fe3O4, MnO2 and Al2O3 . Microchim Acta 184, 1223–1232 (2017). https://doi.org/10.1007/s00604-017-2126-2

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