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Dispersed Solidified Fine Droplets Based on Sonication of a Low Melting Point Deep Eutectic Solvent: a Novel Concept for Fast and Efficient Determination of Cr(VI) in Urine Samples

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Abstract

Cr(VI) has carcinogenic effects, so determination of trace amount of chromium in human body such as urine has a great deal of importance. In this work, a novel microextraction method was developed based on solidification of dispersed fine droplets (SDFD) of a low melting point deep eutectic solvent (DES), produced with the aid of sonication, for fast and efficient determination of Cr(VI) in urine samples. Cr(VI) contents of the human urine samples were first complexed using 1,5-diphenylcarbazone at pH ≈ 2.0 and then extracted by the method. A cloudy solution was achieved by the sonication of a microliter volume of a new water-immiscible DES consisting of benzyltriphenylphosphonium bromide (BTPPB) and phenol. Low freezing point of DES makes it possible to use simple, precise, and fast collection of the extraction phase by solidification and the subsequent centrifugation. Finally, the sedimented phase was diluted with methanol and analyzed by electrothermal atomic absorption spectrometry (ETAAS). The influences of the main factors on the efficiency of the procedure were investigated by a four-factor central composite design (CCD). Under the optimum conditions, the calibration curve was linear within the range of 10–1000 ng L−1. The intra- and inter-day RSD% values of 2.6 and 4.7% were obtained at the concentration of 50.0 ng L−1, respectively. The limits of detection (LOD) and quantification (LOQ) were calculated as 2.0 and 7.0 ng L−1, respectively. Moreover, compared to the other approaches, the proposed method presented better or comparable analytical performance and provided accurate, precise, and reliable results for trace analysis of Cr(VI) in urine samples.

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Funding

Financial support was provided by K.N. Toosi University of Technology (Tehran, Iran).

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Authors and Affiliations

  1. Department of Analytical Chemistry, Faculty of Chemistry, K.N. Toosi University of Technology, P.O. Box 16315-1618, Tehran, Iran

    Shahram Seidi, Leila Alavi & Ali Jabbari

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  1. Shahram Seidi
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  2. Leila Alavi
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  3. Ali Jabbari
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Correspondence to Shahram Seidi.

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The authors declare that they have no conflict of interest.

Ethical Approval

All procedures in this study involving human participants were in accordance with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards and performed with permission from the Educational and Research Committee (K. N. Toosi University of Technology) under the direct supervision of the Local Medical Clinic of the university (Approval Number 290695-A/29987).

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Informed consent was obtained from all individual participants included in the study.

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Seidi, S., Alavi, L. & Jabbari, A. Dispersed Solidified Fine Droplets Based on Sonication of a Low Melting Point Deep Eutectic Solvent: a Novel Concept for Fast and Efficient Determination of Cr(VI) in Urine Samples. Biol Trace Elem Res 188, 353–362 (2019). https://doi.org/10.1007/s12011-018-1438-3

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  • DOI: https://doi.org/10.1007/s12011-018-1438-3

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