I think Geotechnical Instruments do a fact sheet on cross gas interferance for that specific reason. I will post when back in the office if I can find it amongst a trillion PDFS'. FID destroys and resolves all HC to a total while Infra Red takes the Methane but can be well affected if there are especially light end Aliphatics, Alkanes\ Alkenes so efcfectively a false methane measurement.
Its been a long 'hot' week. Looks like summer is at long last here!!!
Regards,
Robin Mackenzie
Contaminated Land Co-ordinator
Perth and Kinross Council
Tel 01738 476443
Mob: 07810057566
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