Quaternary ammonium modified silica anion exchanger for SPE (SAX)
Base material silica, pore size 60Å, particle size 45µm, specific surface 500m²/g, pH stability 2 to 8. Silica modified with quaternary amine. Strongly basic anion exchanger (capacity ~ 0.3meq/g). Not suited for very strong anions such as sulphonic acids, because these are difficult to elute.
Recommended application: organic acids, caffeine, saccharin.