Macherey-Nagel SPE Cartridge, CHROMABond column PSA 3 ml, 500 mg, PP, 50/PAK

Silica gel modified with propylsulfonic acid, very strong cation exchanger (SCX). Capacity ~ 0.7 meq/g, contrary to the SA phase no π-π interactions. If you are looking for PSA (primary and secondary amine - used with QuEChERS mixes), please see QuEChERS or Diamino.