AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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STUDIA CHEMIA - Ediţia nr.3 din 2007 | |||||||
Articol: |
INVESTIGATION OF MICELLAR PROPERTIES OF ANIONIC SURFACTANTS WITH THE AID OF PVC-MEMBRANE DODECYL SULFATE ELECTRODE. Autori: SIMONA ANTOANELA GAVAN, DAN FLORIN ANGHEL. |
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Rezumat: A polymer matrix electrode selective to anionic surfactants has been proposed. The active matter of the electrode was the dodecyltrimethylammonium dodecyl sulfate ion-pair. The matrix was made of high-molecular weight poly(vinyl chloride) (PVC) plastified with 2-nitrophenyl octyl ether. The electrode had Nernstian response with a slope of 57.3 ± 0.2 mV per decade over a range of dodecyl sulfate concentration from 3.5 x 10-6 to 6.0 x 10-3 M, and a detection limit of 2.2 x 10-6 M. The electrode was very selective towards inorganic interfering anions. Among the organic anions only those with surfactant properties did interfere. The working pH of the electrode was in the 3.0 - 13.0 range. The electrode was used to determine the critical micelle concentration (CMC) of sodium dodecyl sulfate (SDS) in the absence and presence of water-soluble organic additives and of inorganic electrolytes. | |||||||