Characterization of Paraoxon-ethyl and Parathion-ethyl Complexes with β-Cyclodextrin Modified Zirconium Oxide Thin Films by Infrared Spectroscopy

Minh Phuong Ngoc Bui, Honest Makamba, Seong S. Seo

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The detection of organophosphate compounds was demonstrated using sol–gel materials made of zirconia composite films. The detection was performed via inclusion complexes of the organophosphates of paraoxon-ethyl and parathion-ethyl with the zirconium dioxide-β-cyclodextrin composite film. The formation of sol–gel thin film process was investigated and optimized. The morphology of zirconium dioxide with β-cyclodextrin gel was characterized by scanning electron microscopy and energy-dispersive spectroscopy. Attenuated total reflectance Fourier transform infrared spectroscopy was used for the characterization of the inclusion complexes of paraoxon-ethyl and parathion-ethyl on zirconium dioxide with β-cyclodextrin film. The hydrolysis of paraoxon-ethyl by zirconium dioxide with the β-cyclodextrin gel thin film caused peak shifts in the attenuated total reflectance Fourier transform infrared spectra. The increase in absorption intensity correlated with increasing paraoxon-ethyl concentration, but this trend was not observed for parathion-ethyl. The hydroxyl vibration band of the intermolecular and intramolecular hydrogen bonds was observed to decline with increasing paraoxon-ethyl concentration. Quantitative analysis of paraoxon-ethyl using attenuated total reflectance Fourier transform infrared spectra provided a linear calibration relationship from 1 to 7 µM with a limit of detection as low as 30 nM.

Original languageEnglish (US)
Pages (from-to)1600-1612
Number of pages13
JournalAnalytical Letters
Volume49
Issue number10
DOIs
StatePublished - Jul 2 2016

Keywords

  • Attenuated total reflection-fourier transform infrared spectroscopy
  • organophosphate
  • paraoxon-ethyl
  • zirconium sol–gel process
  • β-cyclodextrin

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