ISSN:
1040-0397
Schlagwort(e):
Adsorptive stripping tensammetry
;
Non-ionic surfactants
;
Oxyethylated alkyphenols
;
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
The dependence of the peak height on the concentration of surfactant, the preconcentration time, and the preconcentration potential was examined. The behavior of the Triton X series fits the general scheme of the behavior of ethoxylates. Tritons having a lower number of ethoxylene subunits (EO) (1-12.5) form wide, analytically useful peaks within the range of the growing section on the calibration plot. A further increase in the concentration causes complicated transformations to appear on the tensammetric curve, which are caused by association. The wide peak is shifted irregularly in the negative direction and finally disappears, being transformed into a vertical line. An additional, usually needle-shaped peak appears instead. Surfactants having a higher EO (30-40) form a narrow double peak, which is an analytically useful signal; this transforms into a single narrow one when the concentration increases. The higher the EO in Tritons, the broader the range of potentials for their adsorption.
Zusätzliches Material:
12 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/elan.1140070204
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