| ID | Type | Description | All ontologyterms |
|---|---|---|---|
| 1 | Ion exchange SPE | Electrostatic interactions between the analyte of interest can be anion or cation | — |
| 2 | Normal-phase SPE | Polar stationary phase | — |
| 3 | Reverse-phase SPE | Apolar stationary phase | — |
| 4 | Mixed mode SPE | Combination of retention mechanisms on a single cartridge | — |