Hi

As you know VF-5 is about 5% more polar than VF-1 . If VF-5 is available in your lab, it is better to use it for pesticides. We could separate about 13 OPPs in VF-5 column. For FAMES it is better to use more polare column such as CP-SIL19-CB. For n-alkanes VF-1 is suitable.

Good luck

Maryam

 Maryam, thanks a lot for your sugestions. Our idea is to have a kind of universal column in order to analize both groups of compounds.

Thank you for your kindness

Juan

We do analyse more that 300 pesticides using Agilent DB-1701 column (30 mx0.25 mm ) by Agilent GC/MS. If you want to analyse full range of FAMES (around 46 compounds ), supelco SP 2560 (100mx0.25 mm ) does better job in separation.

I think for analyze both  of FAMES and pesticides DB-5 is better than DB-1.

with regards

maryam