ISO 6121:1988 Preview
Surface active agents -- Technical alkane sulfonates -- Determination of alkane monosulfonates content by direct two-phase titration
This standard was last reviewed and confirmed* in 2013.
*Therefore this version remains current
The determination is carried out in a consisting of an aqueous phase and a chloroform phase, in the presence of sodium sulfate, by titration against a standard volumetric cationic-active solution (benzethonium chloride), in the presence of an indicator consisting of a mixture of a cationic dye (dimidium bromide) and an anionic dye (acid blue 1).