Before selecting any SPE phase, you need to know a few things about your sample/analyte to make the correct determination:
Type of sample matrix
Type of analyte
Sample volume
With this knowledge, you can refer to sorbent selection guide found in the Agilent SampliQ SPE Brochure (Pub #5989-9334EN) to select the proper Agilent SampliQ SPE phase.
Please contact your local Agilent Technologies representative if you need more details.