Re: Measuring oxygen in hydrocarbon gas at ppb levels


<rekuci@xxxxxxxxx> wrote in message
news:1165246424.169895.145690@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

d&tm wrote:
I know there are electrochemical instruments that can do this but are
there
any chemical methods eg bubbling the gas through a reagent etc that
would be
able to measure oxygen in ethylene down to the ppb level.?
terry

Titrimetric or colorimetric probably can't do ppb here. Packed column
GC with a molecular sieve column can measure down to ppb - run at lower
temperature to elute oxygen, then stop data acquisition and heat it up
to get rid of ethylene bulk, which will elute later. There may be
other ways of dealing with the ethylene, try
www.chromatographyforum.com for better expert opinions.

thanks for the suggestion
terry


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