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Assay of Total Mercury in Commercial Food Supplements of Marine Origin by Means of DLLME/ICP-AES

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Abstract

In this work, we have developed a sensitive and cost-effective preconcentration and quantification methodology for total mercury (Hg) at trace levels in food supplements of marine origin. Dispersive liquid–liquid microextraction was successfully employed for the preconcentration of mercury at trace levels prior to inductively coupled plasma atomic emission spectrometry. The mercury was extracted as mercury-1, 5-diphenyl-3-formazathiol complex, at pH 1.0 mediated by multidroplet formation of microextraction solvent assisted by disperser solvent. The lower limit of detection obtained under the optimal conditions was 0.24 μg L−1. The calibration graphs were linear up to 500 μg L−1. The precision of the method in terms of relative standard deviation was 4.8% for the concentration of 100 μg L−1. In order to validate the proposed method, a certified reference material RTC-QCI-049 was analyzed with the proposed procedure. Moreover, potential interference by 20 species was also evaluated.

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Acknowledgement

The authors are grateful to the Council of Iranian University of Science and Technology (IUST) and University of Tehran for fellowships and financial supports, as well as to Barbora Ehrlichová for proofreading of the text.

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Authors and Affiliations

  1. Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, Tehran, Iran

    Araz Bidari, Mohammad Reza Ganjali & Parviz Norouzi

  2. Endocrinology & Metabolism Research Center, Tehran University of Medical Sciences, Tehran, Iran

    Mohammad Reza Ganjali & Parviz Norouzi

  3. Department of Analytical Chemistry, Faculty of Chemistry, Iran University of Science and Technology, PO Box 16846-13114, Tehran, Iran

    Yaghoub Assadi & Armin Kiani

  4. Electroanalytical Chemistry Research Center, Iran University of Science and Technology, PO Box 16846-13114, Tehran, Iran

    Yaghoub Assadi

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  1. Araz Bidari
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  2. Mohammad Reza Ganjali
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  3. Yaghoub Assadi
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  4. Armin Kiani
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  5. Parviz Norouzi
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Correspondence to Mohammad Reza Ganjali.

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Bidari, A., Ganjali, M.R., Assadi, Y. et al. Assay of Total Mercury in Commercial Food Supplements of Marine Origin by Means of DLLME/ICP-AES. Food Anal. Methods 5, 695–701 (2012). https://doi.org/10.1007/s12161-011-9297-y

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  • DOI: https://doi.org/10.1007/s12161-011-9297-y

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