An anion surfactant was analyzed using Asahipak GF-310 HQ (a multisolvent GPC column). When anion surfactants were dissolved in aqueous solution, its anion part acts as surfactant. Anion surfactants are used in detergents and textile industries. Sodium dodecylbenzenesulfonate, an anion surfactant has two forms, soft type and hard type. And, it is important to distinguish the two forms from the enviromental point of view. GF-310 HQ can distinguish soft type and hard type quite easily. Several peaks can be observed for soft type and single peak can be observed for hard type.
Sample : 100ppm Sodium dodecylbenzenesulfonate, 20µL
Column : Shodex Asahipak GF-310 HQ (7.6mmID*300mm)
Eluent : 50mM NaCl aq./CH3CN=50/50
Flow rate : 0.6mL/min
Detector : UV(220nm)
Column temp. : 30°C