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Fe3O4-modified graphene oxide as a sorbent for sequential magnetic solid phase extraction and dispersive liquid phase microextraction of thallium

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Abstract

A combination of magnetic solid phase extraction (MSPE) and dispersive liquid phase microextraction (DLPME) was applied in a new method for preconcentration and extremely sensitive determination of thallium in aqueous samples. The first step of extraction uses a Fe3O4-graphene oxide conjugate whose surface was covalently linked to the chelator 4-methyl-2(2-pyrazinyl)-1,3-thiazole-5-carboxy acid. After completion of MSPE, the nanoparticles were eluted with benzyl alcohol. In order to further enhance preconcentration, the benzyl alcohol phase containing the thallium chelate is used as a dispersing solvent for DLPME. After the elution, the preconcentrated thallium phase is transferred into a Rh/Pt/Pd-modified graphite tube and quantified via graphite furnace AAS. After optimization of the experimental conditions, the calibration plot is linear in the 0.015 to 4 μg·L−1 thallium concentration range, and the detection limit (at an S/N ratio of 3) is 12 ng·L−1. An absolute detection limit of 120 fg was determined when injecting a 10 μL volume into the graphite furnace. When using a 100 mL sample solution and 10 μL of the extraction solvent, the enrichment factor is as large as 6500, with an overall 65% recovery if MSPE and DLPME are combined. Selectivity of the method is achieved by masking of possibly interfering ions with EDTA.

Magnetic solid phase extraction (MSPE) was combined with dispersive liquid phase microextraction (DLPME) as a new method for preconcentration and extremely sensitive determination of thallium in aqueous samples.

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Authors and Affiliations

  1. Faculty of Sciences, Department of Chemistry, Hakim Sabzevari University, Sabzevar, Iran

    Saeid Nazari, Ashraf Mehri & Asma Sepehri Hassannia

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  1. Saeid Nazari
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  2. Ashraf Mehri
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Correspondence to Saeid Nazari.

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Nazari, S., Mehri, A. & Hassannia, A.S. Fe3O4-modified graphene oxide as a sorbent for sequential magnetic solid phase extraction and dispersive liquid phase microextraction of thallium. Microchim Acta 184, 3239–3246 (2017). https://doi.org/10.1007/s00604-017-2340-y

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