Suitable columns for gas analysis

[Shenaz Moola]

We've recently purchased a gas chromatograph and want to place an 
order for the columns. From the literature, there appears to be a 
number of different types of columns all being used for the same 
analyses. We've set up lysimeters containing household waste and 
sewage sludge. The gases we want to check for are methane, carbon 
dioxide, oxygen, nitrogen, nitrous oxide and hydrogen. Can anyone 
suggest suitable columns for their detection.

Thank you
Shenaz
                                                                      
                                  '''                               
                                ( O O )                              
                   #------oOO-----(_)-------------#
                   |                              |
                   |        Shenaz Moola          |
                   | shenaz at civen.civil.wits.ac.za|
                   |                              |
                   #---------------------oOO------#   
                                |  |  |
                                |__|__|
                                 ll ll
                                 ll ll
                                ooO Ooo