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. 2020 Feb 11;17(4):1138.
doi: 10.3390/ijerph17041138.

Modified Screen-Printed Potentiometric Sensors based on Man-Tailored Biomimetics for Diquat Herbicide Determination

Ayman H Kamel  1 , Abd El-Galil E Amr  2   3 , Nashwa S Abdalla  1 , Mohamed El-Naggar  4 , Mohamed A Al-Omar  2 , Abdulrahman A Almehizia  2
Affiliations

Modified Screen-Printed Potentiometric Sensors based on Man-Tailored Biomimetics for Diquat Herbicide Determination

Ayman H Kamel et al. Int J Environ Res Public Health. .

Abstract

Screen-printed platforms integrated with molecularly imprinted polymers (MIP) were fabricated and characterized as potentiometric sensors for diquat (DQ). The synthesized MIP beads were studied as sensory carriers in plasticized poly(vinyl chloride) membranes. The sensors were constructed by using poly(3,4-ethylenedioxythiophene) (PEDOT) as solid-contact material to diminish charge-transfer resistance and water layer potential. Conventional ion-selective electrodes (ISEs) with internal filling solution were used for comparison. The designed electrodes showed near Nernstian slopes of 28.2 ± 0.7 (r² = 0.999) over the concentration range of 1.0 × 10-6-1.0 × 10-2 M with the limit of detection 0.026 µg/mL over the pH range 4.2-9.0. The electrode exhibited good selectivity for diquat cations over a large number of organic and inorganic cations. The sensor was successfully introduced for direct measurement of diquat content in commercial pesticide preparations and different spiked potato samples. The results showed that the proposed electrode has a fast and stable response, good reproducibility, and applicability for direct assessment of diquat content. The proposed potentiometric method is simple and accurate in comparison with the reported HPLC methods. Besides, it is applicable to turbid and colored sample solutions.

Keywords: diquat dibromide (DQ) solid-contact ISEs; molecularly imprinted polymers (MIPs); organic pollutant; poly(3,4-ethylenedioxythiophene) (PEDOT); screen-printed.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Scheme for screen printing of silver/carbon/PEDOT:PSS—diquat electrode.
Figure 2
Figure 2
FT-IR spectra for: (a) diquat; (b) diquat /MIP, (c) MIP/washed and (d) NIP beads.
Figure 3
Figure 3
Potentiometric response curves obtained screen-printed ISEs integrated with MIP.
Figure 4
Figure 4
Water-layer tests for the diquat-ISE with and without PEDOT:PSS as solid contact transducer.
Figure 5
Figure 5
Chronopotentiograms (applied current: ±1 nA for 60 s) for solid-contact diquat ISEs.
See this image and copyright information in PMC

References

    1. Gonzalez-Pradas E., Villafranca-Sainchez M., Rey-Bueno F.D., Urena-Amate M.D., Socias-Viciana M., Femfindez-Perez M. Removal of diquat and deisopropylatrazine from water by ontmorillonite-(Ce or Zr) phosphate crosslinked compound. Chemosphere. 1999;39:455–466. doi: 10.1016/S0045-6535(98)00597-9. - DOI
    1. Pateiro-Moure M., Arias-Estévez M., Simal-Gándara J. Critical Review on the Environmental Fate of Quaternary Ammonium Herbicides in Soils Devoted to Vineyards. Environ. Sci. Technol. 2013;47:4984–4998. doi: 10.1021/es400755h. - DOI - PubMed
    1. European Commission Peer Review. [(accessed on 16 January 2020)]; Available online: https://ec.europa.eu/social/main.jsp?catId=1024&langId=en.
    1. Hazardous Substances Databank, Toxicology Data Network, U.S. National Library of Medicine, Bethesda, MD. [(accessed on 16 January 2020)];1988 Available online: https://www.nih.gov/about-nih/what-we-do/nih-almanac/national-library-me....
    1. Chichila T., Walters S. Liquid Chromatographic Determination of Paraquat and Diquat in Crops Using a Silica Column with Aqueous Ionic Mobile Phase. JAOAC. 1991;74:961–967. doi: 10.1093/jaoac/74.6.961. - DOI - PubMed

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