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Ion Conductivity Test

  1. Secure the 100% CEC film in the osmosis apparatus.
  2. Fill the left side of the apparatus with water and ensure that no liquid leaks through the film. Then fill the right side of the apparatus with salt solution. Record the starting levels of each side.
  3. Place an electrode in each side.
  4. Record the conductivity every 5 minutes for the first hour, then once each hour afterwards.
  5. Leave the film in the apparatus until Wednesday.
  6. On Wednesday, measure the conductivity one final time and then remove the film from the apparatus.


Ion Conductivity


  • Originally a PVOH/glutaraldehyde film was used, but it broke when placed into the apparatus
  • Some leaking was observed in the osmosis apparatus
  • The ion solution consists of 100 ppm Cl-, 100 ppm Br-, and 100 ppm SO42- all as Na+ salts

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