Nonionic and Ionic Surfactants (1)

With Asahipak GS-310 7G (a multisolvent GPC column), a nonionic surfactant coexisting with an ionic surfactant can be measured separately from the ionic surfactants. Since the column is packed with a gel which has slight amount of carboxyl group, the ionic substance is excluded first when an eluent containing no salt is used.
GS-310 7G is an old type of GF-310 HQ.


Sample : 5ppm each, 25micro-L
(A) Octylphenol ethoxylate sulfate, Polyoxyethylene octylphenyl ether sulfate
(B) Octylphenol ethoxylate, Polyoxyethylene octylphenyl ether

Column       : Shodex Asahipak GS-310 7G (7.5mmID*500mm)
Eluent       : H2O/CH3CN=60/40
Flow rate    : 1.0mL/min
Detector     : UV(280nm), Non-suppressed conductivity
Column temp. : 30deg-C