Publication Details |
| Category | Text Publication |
| Reference Category | Journals |
| DOI | 10.1016/j.chroma.2013.09.041 |
| Title (Primary) | 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 |
| Author | Wang, F.; Chen, Y.; Hermens, J.L.M.; Droge, S.T.J. |
| Source Titel | Journal of Chromatography A |
| Year | 2013 |
| Department | AUC |
| Volume | 1315 |
| Page From | 8 |
| Page To | 14 |
| Language | englisch |
| Keywords | SPME-fibers; Cationic surfactant; Cation-exchange; pKa; Sorption; Humic acida |
| UFZ wide themes | 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–1μM(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. |
| Persistent UFZ Identifier | 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 10.1016/j.chroma.2013.09.041 |
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