Details zur Publikation

Referenztyp Zeitschriften
DOI / URL Link
Titel (primär) Evaluation of passive samplers with neutral or ion-exchange polymer coatings to determine freely dissolved concentrations of the basic surfactant lauryl diethanolamine: measurements of acid dissociation constant and organic carbon–water sorption coefficient
Autor Wang, F.; Chen, Y.; Hermens, J.L.M.; Droge, S.T.J.;
Journal / Serie Journal of Chromatography A
Erscheinungsjahr 2013
Department AUC;
Band/Volume 1315
Sprache englisch;
POF III (gesamt) T42;
Keywords SPME-fibers; Cationic surfactant; Cation-exchange; pKa; Sorption; Humic acida
UFZ Querschnittsthemen RU3;
Abstract A passive sampler tool (solid-phase microextraction, SPME) was optimized to measure freely dissolvedconcentrations (Cw,free) of lauryl diethanolamine (C12-DEA). C12-DEA can be protonated and act as acationic surfactant. From the pH-dependent sorption to neutral SPME coatings (polyacrylate and PDMS),a pKaof 8.7 was calculated, which differs more than two units from the value of 6.4 reported else-where. Polyacrylate coated SPME could not adequately sample largely protonated C12-DEA in humic acidsolutions of pH 6. A new hydrophobic SPME coating with cation-exchange properties (C18/SCX) sorbedC12-DEA 100 fold stronger than polyacrylate, because it specifically sorbs protonated C12-DEA species.The C18/SCX-SPME fiber showed linear calibration isotherms in a concentration range of <1 nM–1 M(well below the CMC). Using the C18/SCX-SPME fibers, linear sorption isotherms to Aldrich humic acid atpH 6 (ionic strength 0.015 M) were measured over a broad concentration range with a sorption coefficientof 105.3.
ID 14068
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=14068
Wang, F., Chen, Y., Hermens, J.L.M., Droge, S.T.J. (2013):
Evaluation of passive samplers with neutral or ion-exchange polymer coatings to determine freely dissolved concentrations of the basic surfactant lauryl diethanolamine: measurements of acid dissociation constant and organic carbon–water sorption coefficient
J. Chromatogr. A 1315 , 8 - 14