How does GC did work?

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How does GC did work?..

Gc FID uses hydrogenairflame
In to which sample is passed to oxidise or burn organic molecules or hydrocarbons.it produces electrically charged particles or ions.(any hydrocarbon in sample will produce ions when they are burnt).the ions are collected and produce an electrical signal
Which is then measured.
Thanks,
B.Gangatharan,
Caplin point.

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