analysis of NO,CO,N2O,N2,CH4,CO2,O2

[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

[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.

[mantri21]

thanks dpr for kind suggestions
should porapak Q or Hayesep DB is suitable for only N2O CO2 AND HC SEPERATION
DINESH MANTRI

[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

[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.