a larger surface area has higher capacity for solute.
There is an inverse relationship between surface area and pore size: the smaller the pore size the
greater the surface area. On the following page is a table of comparative physical data. More detailed
information for each resin is available on request.
The nonpolar XAD resins are generally used for adsorption of organic substances from aqueous systems
and polar solvents. For hydrophobic compounds up to MW 20,000, XAD-2 has been widely used, but it
was discontinued by Rohm and Haas.2
Currently suggested:
1. for relatively low molecular weight (MW), XAD-4
2. for small to medium MW, XAD-16
3. for relatively large MW organics, X1180.