ISO 8799:1988

Surface active agents — Sulfated ethoxylated alcohols and alkylphenols — Determination of content of unsulfated matter

From a methanolic solution of the test portion, the unsulfated matter is separated on an ion-exchange column (filled with a mixture of cation-exchange resins and anion-exchange resins). The unsulfated matter is recovered from the eluate by evaporation and weighing of the residue.