Chromatography Forum

hello to all of u,
presently i am working on ETFAA and analyse it on capillary column with inj. temp. of 290°c , but when i studied with varying inj. temp. i got that 2-peaks which was showing on 290c is continuous with lowering in inj. temp. reduced and at 150°c it was reduced from 1% to 0.1%.

I dosen't understand which injector temp is suitable b' some impurities are not eluted with low inj. temp.
also the column bleeding is continuously increasing.
i just want t know is this stationary phase is suitable for this compound or not.

injector degradation

From your description you want to analyze a compound that will degrade in a hot inlet, but need the higher temperature to see some contaminants? If this is the case, you need to consider using a temperature programmable inlet or an on-column injection. These will allow the compounds to go onto the column of interest at a low temperature and elute from the column without (or with minimal) thermal degradation and then allow high boilers to also elute from the column.