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

equivalent to JB7091-03 Silica gel modified with quaternary amine, strongly basic anion exchanger (SAX). Capacity ~ 0.3 meq/g, not suited for very strong anions such as sulfonic acids, because these are difficult to elute.