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Sampling Materials

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Overview

Sampling materials used throughout the odour measurement process (from obtaining a sample to analysis) require an absent or minimized inference with the odorant gas. The main criteria for the material of the sampling container/bag or device are outlined below:

  • The material be inert with the odorous gas
  • The material be odourless
  • Material be of low permeability to prevent diffusion of odorant gas and outside environment across the material
  • Opaque so as to prevent odorous gas from reacting/degrading with sunlight
  • Impervious so as to
  • Smooth surface
Inert Materials

Materials listed below are inert:

  • Polytetrafluoroethylene (PTFE, Teflon TM)
  • the copolymer of Tetrafluoroethylene and Hexafluoropropylene (FEP)
  • Polyethylene terephthalate (PET, Nalophan TM )
  • glass (disadvantage: fragility)
  • steel (advantage: high mechanical and thermal stability; disadvantage: not always chemically inert, condensations or other depositions)
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