Details zur Publikation

Referenztyp Zeitschriften
DOI / URL Link
Titel (primär) Analyzing freely dissolved concentrations of cationic surfactant utilizing ion-exchange capability of polyacrylate coated solid-phase microextraction fibers
Autor Chen, Y.; Droge, S.T.J.; Hermens, J.L.M.;
Journal / Serie Journal of Chromatography A
Erscheinungsjahr 2012
Department AUC;
Band/Volume 1252
Sprache englisch;
Keywords SPME; quaternary ammonium compound; polyacrylate; cation exchange
Abstract

A 7-μm polyacrylate (PA) coated fiber was successfully employed to determine freely dissolved concentrations of cationic surfactants by solid-phase microextraction (SPME) and utilizing the capability of the PA-coating to sorb organic cations via ion-exchange at carboxylic groups. Measured fiber–water partitioning coefficients (Kfw) were constant below a fiber loading of 2 mmol per liter polyacrylate, allowing for simple and accurate analysis in a concentration range that is relevant from a risk assessment point of view. Ion-exchange was confirmed to be the main sorption mechanism because of a decreasing Kfw with either higher CaCl2 concentrations or lower pH, and maximum fiber uptake at the polyacrylate cation-exchange capacity (CEC, at 30 mmol/L PA). Fiber–water sorption isotherms were established in various aqueous media in toxicological relevant concentrations. The developed SPME method has a high potential for application in ecotoxicological studies, as demonstrated in sorption studies with humic acid in different electrolyte solutions at aqueous concentrations down to the sub nM range. Cationic surfactant sorption affinities for humic acid also depend on medium composition but are orders of magnitude higher than to the PA fiber on a sorbent weight basis.


ID 12837
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=12837
Chen, Y., Droge, S.T.J., Hermens, J.L.M. (2012):
Analyzing freely dissolved concentrations of cationic surfactant utilizing ion-exchange capability of polyacrylate coated solid-phase microextraction fibers
J. Chromatogr. A 1252 , 15 - 22