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analysis of NO,CO,N2O,N2,CH4,CO2,O2
Posted: Fri Feb 24, 2006 7:26 am
by mantri21
hi
for automobile exhaust which generally contains NO,CO,N2O,CH4 in ppm level N2,CO2, Aand O2 in %., which column is suitable for the analysis of these gases. is porapak Q is ok.
also what temperaure and which carrier gas is useful...as the exhaust contains lot much N2. then should He or H2 are suitable for carrier gas.
thanks
if possible mail me on
dinesh_mantri1@yahoo.com
Posted: Fri Feb 24, 2006 2:01 pm
by dpr
I don't think Q or a Poraplot Q capillary will split N2, O2 or CO.
Have a look at a CP CarboPlot, might be more suitable.
Is it possible to set up the GC with twin columns, perhaps Q in one side and a moly sieve in the other with column switching.
Any of the column suppliers will have a good technical help resource.
A direct question to Agilent, Varian or Restek and they'll generally point you in the right direction.
Posted: Fri Feb 24, 2006 6:55 pm
by mantri21
thanks dpr for kind suggestions
should porapak Q or Hayesep DB is suitable for only N2O CO2 AND HC SEPERATION
DINESH MANTRI
Posted: Fri Feb 24, 2006 7:42 pm
by chromatographer1
Relative times to ethane = 1.00 for the following gases on a Porapak QS @ 30°C
0.176 Nitrogen
0.213 NO
0.273 Methane
0.420 CO2
0.534 NO2
You will need a long column, perhaps a micropacked, for best resolution.
Supelco can make micropacked columns as long as 10 meters with this packing.
Rodney George
Senior Research and Development Scientist
Gas Separations Research
Supelco
595 North Harrison Road
Bellefonte, PA 16823
814-359-5737 voice
814-359-5459 fax
rgeorge@sial.com
Posted: Fri Mar 10, 2006 11:12 pm
by jamott
Take a look at the Restek ShinCarbon columns. Very good for fixed gases. The only problem might be between O2 andN2, as they are not quite baseline resolved, depending on concentrations.