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Effect of Surfactants and Related Biological Active Substances on the O 2 /H 2 O 2 Voltammetry and Its Utilization for Determination of the Total Surfactant Content
Author(s) -
Novotný Ladislav,
Navrátil Tomás˘
Publication year - 1998
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/(sici)1521-4109(199807)10:8<557::aid-elan557>3.0.co;2-s
Subject(s) - sodium dodecylbenzenesulfonate , pulmonary surfactant , chemistry , aqueous solution , seawater , electrolyte , voltammetry , supporting electrolyte , calibration curve , oxygen , inorganic chemistry , analytical chemistry (journal) , detection limit , chromatography , electrochemistry , electrode , organic chemistry , biochemistry , oceanography , geology
The effect of surfactants on the second voltammetric reduction peak of air oxygen dissolved in aqueous electrolyte solutions is described. Sodium dodecylbenzenesulfonate (DBSNa) was used as a model surfactant in the concentration range 9 × 10 −8 –9 × 10 −7 mol L −1 . With increasing DBSNa concentration the second oxygen reduction peak increases and shifts to negative potentials. Measurements were carried out in pure 0.1 mol L −1 KCl as well as in freshly collected samples of seawater. By means of calibration plots obtained with DBSNa we could determine the total surfactant concentration in seawater, i.e., the voltammetric surfactant background signal. Expressed in equivalent concentration of DBSNa this background amounted to 3 × 10 −7 mol L −1 .