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