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Microchimica Acta

, 186:396 | Cite as

Molecularly imprinted graphite spray ionization-ion mobility spectrometry: application to trace analysis of the pesticide propoxur

  • Tahereh Zargar
  • Mohammad T. JafariEmail author
  • Taghi KhayamianEmail author
Original Paper
  • 108 Downloads

Abstract

A porous graphite sheet modified by a molecularly imprinted polymer (MIP) was directly used as the spray ionization source for ion mobility spectrometry (IMS). Therefore, it was possible to selectively analyze samples extracted by the molecularly imprinted polymer. This obviates the need for the steps of elution, solvent evaporation, dissolution and injection. To prepare the sheet, the graphite surface was first modified by electrodeposition of a molecularly imprinted polypyrrole film. This polypyrrole film was fabricated in a three-electrode electrochemical system using cyclic voltammetry. The electropolymerization of the graphite sheet was carried out with LiClO4 as a supporting electrolyte in the reaction solution. The effects of the amount of monomer, the level of template concentrations, and the time of polymerization on the extraction efficiency of the MIP film were evaluated. The extraction conditions including extraction time, the extraction temperature, the pH values, the salt concentrations, and the stirring rate were also studied. Methanol was selected as the most suitable solvent for both desorption and ionization which occur simultaneously. The pesticide propoxur (acting as a test compound) was extracted from water samples and directly analyzed using IMS. The analytical parameters (working range: 1.0 to 250 ng·mL−1; detection limit: 0.3 ng·mL−1) indicated that the direct coupling of MIP and IMS has a great potential in terms of reproducibility, and speed of the analysis, while maintaining acceptable sensitivity.

Graphical abstract

Schematic presentation of molecularly imprinted graphite spray ionization coupled with ion mobility spectrometry (IMS) for rapid/selective extraction and ionization: Application to the pre-concentration of propoxur prior to its quantification by IMS.

Keywords

MIP separation Electropolymerization Modified graphite sheet Spray ionization IMS technique Pesticide Thin film micro-extraction 

Notes

Acknowledgments

The Research Community of Isfahan University of Technology (IUT) and Excellence Center in Sensor and Green Chemistry are highly appreciated for providing the financial support of this work.

Compliance with ethical standards

The author(s) declare that they have no competing interests.

Supplementary material

604_2019_3467_MOESM1_ESM.docx (98 kb)
ESM 1 (DOCX 98.4 kb)

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of ChemistryIsfahan University of TechnologyIsfahanIran

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