Operating Principles
• As compounds elute from the analytical column, they are
burned in a hydrogen flame.
• The flame will carry a current across the potential which is
proportional to the organic ions present in the flame from the
burning of an organic compound.
• The current flowing across the flame is amplified and
recorded.
• FID responds to organics on a weight basis.
• It has no response to H2O, NO2
, CO2
, H2S
• Response is best with compounds containing C-C or C-H
bonds