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Inderect tensammetric method for the determination of non-ionic surfactants: Part 1. General properties of the analytical signal

✍ Scribed by Andrzej Szymaǹski; Zenon Ukaszewski

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
891 KB
Volume
260
Category
Article
ISSN
0003-2670

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✦ Synopsis

An indirect method for the determination of non-ionic surfactants is based on the lowering of the tensammetric peak height of ethyl acetate by competitively adsorbed surfactants. The behaviour of the tensammetric peak of ethyl acetate was examined (peak height vs. concentration of ethyl acetate and vs. initial potential). The dependence of the analytical signal on surfactant concentration for numerous oxyethylated alcohols, oxyethylated alkylphenols and oxyethylated amines having different numbers of oxyethylene subunits was examined, and also for several oayethylene-oxypropylene block copolymers and poldethylene glycols), polypropylene glycol, oleyl alcohol and ethylene glycol. In all the instances this dependence exhibits a plateau or a pseudo-plateau. The position of the plateau increases roughly in proportion to the increase in the number of oxyethylene subunits in the molecule. Calibration graphs were constructed within the concentration range 100-1000 pg 1-i for ten oxyethylated alcohols and five oxyethylated alkylphenols. Triton X-100 was selected as the surfactant for calibration. The method enables all non-ionic surfactants separated from surface water by gas stripping, i.e., those having l-30 oxyethylene subunits, to be determined.

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