ASTM 5830

[ozric]

Hello all...

I have recently started analysing waste solvents using ASTM D 5830. Column DB 1701(Varian equivalent) however Hexane and IPA are co-eluting?
Any suggestions to achieve separation??(other than change columns )
I have tried various temp. programmes but to no avail!

Regards

Oz

[chromatographer1]

You can use different starting temperatures as the 1701 has multiple selectivity mechanisms which compete differently at different temperatures.

Other than that, use a small amout of another polar column to pull IPA behind hexane.

Rod