ADSORPTIVE STRIPPING TENSAMMETRY OF OXYETHYLATED ISOOCTYLPHENOLS OF THE TRITON-X SERIES

The dependence of the peak height on the concentration of surfactant, the preconcentration time, and the preconcentration potential was exam ined. The behavior of the Triton X series fits the general scheme of t he behavior of ethoxylates. Tritons having a lower number of ethoxylen e subunits (EO) (1-12.5) form wide, analytically useful peaks within t he range of the growing section on the calibration plot. A further inc rease in the concentration causes complicated transformations to appea r on the tensammetric curve, which are caused by association. The wide peak is shifted irregularly in the negative direction and finally dis appears, being transformed into a vertical line. An additional, usuall y needle-shaped peak appears instead. Surfactants having a higher EO ( 30-40) form a narrow double peak, which is an analytically useful sign al; this transforms into a single narrow one when the concentration in creases. The higher the EO in Tritons, the broader the range of potent ials for their adsorption.