On Sat, 1 Nov 2003 21:39:39 +0200, "George Jnr" <[Only registered users see links. ]>
For the major components of air, the standard method is gas
chromatography, using a molecular sieve packed column, hydrogen or
helium carrier, and thermal conductivity detection. This will give you
relative concentrations of oxygen, nitrogen, and argon, but is not
generally sensitive enough to pick up CO2 or trace gases.
On Sun, 2 Nov 2003 07:41:20 +0200, "George Jnr" <[Only registered users see links. ]>
Yes. Gas chromatography with various detectors, including, but not
limited to, flame ionisation detection, mass spectrometers,
various photoionisation detectors, etc etc. The samples can be
passed through various impingers and traps to concentrate the trace
compounds and then either analyse the trapped material by gas
chromatography or liquid chromatography, or derivatise it
to make it detectable.
There are heaps of articles on the WWW, just search for
the terms air or atmosphere aanalysis and the specific
molecules or trace compounds you are interested in.