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Analytical and Bioanalytical Chemistry

, Volume 406, Issue 8, pp 2197–2204 | Cite as

Screen-printed electrode-based electrochemical detector coupled with in-situ ionic-liquid-assisted dispersive liquid–liquid microextraction for determination of 2,4,6-trinitrotoluene

  • Elena Fernández
  • Lorena VidalEmail author
  • Jesús Iniesta
  • Jonathan P. Metters
  • Craig E. Banks
  • Antonio CanalsEmail author
Research Paper
Part of the following topical collections:
  1. Microextraction Techniques

Abstract

A novel method is reported, whereby screen-printed electrodes (SPELs) are combined with dispersive liquid–liquid microextraction. In-situ ionic liquid (IL) formation was used as an extractant phase in the microextraction technique and proved to be a simple, fast and inexpensive analytical method. This approach uses miniaturized systems both in sample preparation and in the detection stage, helping to develop environmentally friendly analytical methods and portable devices to enable rapid and onsite measurement. The microextraction method is based on a simple metathesis reaction, in which a water-immiscible IL (1-hexyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide, [Hmim][NTf2]) is formed from a water-miscible IL (1-hexyl-3-methylimidazolium chloride, [Hmim][Cl]) and an ion-exchange reagent (lithium bis[(trifluoromethyl)sulfonyl]imide, LiNTf2) in sample solutions. The explosive 2,4,6-trinitrotoluene (TNT) was used as a model analyte to develop the method. The electrochemical behavior of TNT in [Hmim][NTf2] has been studied in SPELs. The extraction method was first optimized by use of a two-step multivariate optimization strategy, using Plackett–Burman and central composite designs. The method was then evaluated under optimum conditions and a good level of linearity was obtained, with a correlation coefficient of 0.9990. Limits of detection and quantification were 7 μg L−1 and 9 μg L−1, respectively. The repeatability of the proposed method was evaluated at two different spiking levels (20 and 50 μg L−1), and coefficients of variation of 7 % and 5 % (n = 5) were obtained. Tap water and industrial wastewater were selected as real-world water samples to assess the applicability of the method.

Keywords

Liquid-phase microextraction Dispersive liquid–liquid microextraction Ionic liquid Screen-printed electrodes 2,4,6-Trinitrotoluene Water samples 

Notes

Acknowledgments

The authors would like to thank the Spanish Ministry of Science and Innovation (project n. CTQ2011-23968), Generalitat Valenciana (Spain) (projects n. ACOMP/2013/072 and PROMETEO/2012/038) and Universidad de Alicante (Spain) (project n. GRE12-45) for the financial support. E.F. also thanks Generalitat Valenciana for her fellowship.

Supplementary material

216_2013_7415_MOESM1_ESM.pdf (124 kb)
ESM 1 (PDF 123 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Elena Fernández
    • 1
  • Lorena Vidal
    • 1
    Email author
  • Jesús Iniesta
    • 2
  • Jonathan P. Metters
    • 3
  • Craig E. Banks
    • 3
  • Antonio Canals
    • 1
    Email author
  1. 1.Departamento de Química Analítica, Nutrición y Bromatología e Instituto Universitario de MaterialesUniversidad de AlicanteAlicanteSpain
  2. 2.Departamento de Química Física e Instituto Universitario de ElectroquímicaUniversidad de AlicanteAlicanteSpain
  3. 3.Faculty of Science and Engineering, Chemistry and Environmental ScienceManchester Metropolitan UniversityManchesterUK

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