Chromatography Forum

1) If a capillary column is left in the GC-FID instrument for 2 months with the instrument switched off (i.e. instrument is not in use),will this affect the performance the column?
Is it necessary to keep the capillary column immediately if it is not in use?

2) If a compound can be analysed using both capillary & packed columns, which is the preferred column?

1. Depends on the column, but it would be best practice to remove the column and plug each end using a septa. Plug the detector and inlet with blank column nuts.

2. Capillary, faster analysis times and lower flow rates means less pricey gas used.

the better column is whichever performs the analysis better. It depends upon the analyte.

Rod