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Adsorptive Stripping Tensammetry of Homogeneous Short‐Chained Dodecylethoxylates
Author(s) -
Lukaszewski Ze,
Szymanski Andrzej,
Nowak Ewa Walentyna,
Wlosek Joanna
Publication year - 2005
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200403189
Subject(s) - pulmonary surfactant , homogeneous , adsorption , stripping (fiber) , chemistry , alkyl , ion , analytical chemistry (journal) , range (aeronautics) , alcohol , chromatography , materials science , organic chemistry , thermodynamics , biochemistry , physics , composite material
Alcohol ethoxylates (AE) comprise the major group of non‐ionic surfactants (NS) discharged into the aquatic environment in large amounts. Tensammetric techniques play a significant role in NS monitoring in the environment. The behavior of homogeneous short‐chained dodecylethoxylate C12E4 (C12E4) under adsorptive stripping tensammetry (AdST) conditions was investigated and the results compared with those of Rokanol L‐4 (L‐4), being an analogical polydispersal commercial product. Surfactant C12E4 consists of an alkyl chain (C12) and four oxyethylene subunits. Cathodic tensammetric curves were recorded at various preconcentration potentials within a range of surfactant concentrations from 20 ppb to 10 ppm. Generally, both surfactants behave similarly: both form a wide, poorly shaped tensammetric peak, the position of which shifts towards the negative direction with growing surfactant concentration as well as a narrow peak located at a more negative potential. However, differences between homogeneous C12E4 and polydispersal L‐4 are observed in detail. In the case of L‐4, the wide peak is very poorly shaped while in the case of C12E4 a much better shaped double peak is observed. The position of the narrow needle‐shaped peak is more negative in the case of L‐4. Polydispersal L‐4 is adsorbed within a wider potential range than homogeneous C12E4.