Contamination Concerns
Use with caution:
PFA (light and dark) PTFE parts (beware: emits COS in light conditions) Stainless steel Glass Synflex or Dekabon tubing if kept flushed Stainless steel collar for soil chambers Silonite treated tubing (Entech) Silcotek or Sulfinert treated parts (Restek) Test for OCS production before using: Gas regulators Pumps Sealants and O-rings |
Avoid:
Rubber (especially in o-rings) Neoprene Most plastic tubing Any surface with sulfate aerosol that can get wet (e.g. filter) Rubber seals in pumps or other wetted parts Black rubber stoppers. Blue bellco stoppers (non-neglible emissions) Plastic collars for soil chambers Black walking mats Paint coatings PVC rubber and plastic Nickel tubing (consumes OCS very quickly - possible "zero air" applications) |