Answer
The attainable quality of analyses with a Metrohm IC depends to a large extent on the separation efficiency of the column used. When purchasing an IC column you should ensure that the separation efficiency suffices for the analysis problems at hand. Ascertain the characteristic data of the IC column on the standard chromatogram enclosed with the column such as capacity factors, selectivity, plate number and resolution and check these data with your own measurements. If any difficulties arise, you should always first check the quality of the column by recording a standard chromatogram.

You will find additional general tips on handling IC separating columns in the 8.732.2003 Metrohm Monograph "Ion chromatography" and in the 8.792.2013 Metrohm Monograph "Practical ion chromatography". Furthermore detailed information can be found in the column catalog and internet.