Determination of chlorinated hydrocarbon species in aqueous solution using Teflon coated ATR waveguide/FTIR spectroscopy

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Abstract

The potential of an optical sensor based on mid-infrared spectroscopy, utilising a zinc selenide (ZnSe) attenuated total reflectance (ATR) element coated with an amorphous Teflon polymer, to determine chlorinated hydrocarbon species (CHC) in an aqueous environment is examined. The polymer coating concentrates the analytes within the penetration depth of the Fourier transform infrared (FTIR) evanescent wave and excludes water from the region. Teflon AF (Amorphous Fluoropolymer) is a family of amorphous copolymers based on polytetrafluoroethylene (PTFE), and is commercially available in two polymeric grades. Teflon AF is highly amorphous in nature with a large 'void volume', exhibits excellent chemical resistance and low water absorption. Such properties identify it as an excellent candidate for enrichment coating on an ATR/FTIR sensor. The potential of both polymeric grades of Teflon AF as enrichment membranes for ATR/FTIR analysis of CHC species was examined and contrasted. A rapid, repeatable, reversible response was observed with both grades to a range of CHC species. Linear responses in the mg/L region, with detection limits in the low mg/L region were achieved with the system used.

Original languageEnglish
Pages (from-to)653-662
Number of pages10
JournalInternational Journal of Environmental Analytical Chemistry
Volume83
Issue number7-8
DOIs
Publication statusPublished - Jul 2003

Keywords

  • Amorphous Teflon
  • Attenuated total reflectance
  • Chlorinated hydrocarbons
  • Diffusion
  • Mid-infrared spectroscopy

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