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A Polypyrrole-Based Sorptive Microextraction Coating for Preconcentration of Malathion from Aquatic Media

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Abstract

A new micro-solid phase extraction method was developed by combining solid-phase extraction and stir bar sorptive extraction to benefit from the advantages of both techniques. A polypyrrole coating was electrochemically synthesized on the surface of an already used graphite furnace, employed in electro-thermal atomic absorption spectroscopy. The cylindrical geometry of the graphite tube provided a rather huge surface area, suitable for sorptive extraction. The novel sorbent coating was examined as an extracting medium to isolate malathion. Effects of different parameters such as extraction time, salt concentration, sample volume, desorption solvent and time were investigated and optimized. Under the optimized conditions, the limit of detection and limit of quantification of the developed method were 5 and 20 ng L−1, respectively. The calibration curve showed linearity in the range of 0.1–100 μg L−1 (R 2 = 0.9968). The precision was evaluated at 0.1 and 1 μg L−1 concentration levels and relative standard deviations (n = 3) were found to be 10 and 7%, respectively. The developed method was successfully applied to the extraction of malathion from real river water and tap water samples, and relative recoveries at the spiked level of 0.1 μg L−1 were 94 and 97%, respectively.

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Acknowledgments

The Research Council and Graduates School of Sharif University of Technology (SUT) are thanked for supporting the project. Also, we would like to acknowledge the Iran National Elite Foundation for their support for Ali Aghakhani.

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Authors and Affiliations

  1. Department of Chemistry, Environmental and Bio-Analytical Laboratories, Sharif University of Technology, P.O. Box 11365-9516, Tehran, Iran

    Habib Bagheri, Ali Aghakhani, Zahra Ayazi & Mahdiar Khakinezhad

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  1. Habib Bagheri
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  2. Ali Aghakhani
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  3. Zahra Ayazi
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  4. Mahdiar Khakinezhad
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Correspondence to Habib Bagheri.

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Bagheri, H., Aghakhani, A., Ayazi, Z. et al. A Polypyrrole-Based Sorptive Microextraction Coating for Preconcentration of Malathion from Aquatic Media. Chromatographia 74, 731–735 (2011). https://doi.org/10.1007/s10337-011-2130-3

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  • DOI: https://doi.org/10.1007/s10337-011-2130-3

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