I need a WAX type column that is more inert than ZB-WAXplus

Thanks for the replies.

I will look into the Agilent UI WAX column (and a few similar options from other suppliers).

The analyte is primarily thermally degraded - so I have got a good peak but by using a low injector temperature (120C), 35C initial oven (6890 GC with small fan - so cannot really go lower), 2C ramp to 250C, and high He flow 3mL/min (constant flow). Splitless injection (splits of 10:1 or 20:1 did not help).

Column is ZB-WAX 30m * .250 * .25.

This is very slow - but works.

I think I will buy a more inert column - with thicker phase , and slightly wider bore, and shorter length.

Thanks again for all your opinions.

Thanks for the replies.

I will look into the Agilent UI WAX column (and a few similar options from other suppliers).

The analyte is primarily thermally degraded - so I have got a good peak but by using a low injector temperature (120C), 35C initial oven (6890 GC with small fan - so cannot really go lower), 2C ramp to 250C, and high He flow 3mL/min (constant flow). Splitless injection (splits of 10:1 or 20:1 did not help).

Column is ZB-WAX 30m * .250 * .25.

This is very slow - but works.

I think I will buy a more inert column - with thicker phase , and slightly wider bore, and shorter length.

Thanks again for all your opinions.

Hi Murray,

think about your thermal degradation. This normally happens already in the liner, even at lower temperatures. I would recommend to use an Ultra-Inert liner too, if you cannot do cold-on-column injections.

Thermal degradation that happens on the column, shows up as a kind of fronting on peaks. Smaller fragments from the degradation process elute faster than the bigger parent molecule, not as tailing.

Cheers,

Norbert

Hi mrobinson,

Dr. Know raises a good point. Perhaps it would help if you could please reply with an image of your peaks that show degradation? Then we could see whether you experiencing fronting or tailing. See How to insert an image in a post or comment 

Thanks. - Josh