title: Determination of anionic surface active agents using silica coated magnetite nanoparticles modified with cationic surfactant aggregates.
abstract: The development of a novel methodology for extraction and preconcentration of the most commonly used anionic surface active agents (SAAs), linear alkylbenzene sulfonates (LAS), is presented herein. The present method, based on the use of silica-magnetite nanoparticles modified with cationic surfactant aggregates, was developed for determination of C10-C13 LAS homologues. The proposed methodology allowed quantitative recoveries of C10-C13 LAS homologues by using a reduced amount of magnetic nanoparticles. Limits of detection were in the range 0.8-1.9μgL(-1) for C10-C13 LAS homologues, while the repeatability, expressed as relative standard deviation (RSD), ranged from 2.0 to 3.9% (N=6). Finally, the proposed method was successfully applied to the analysis of a variety of natural water samples.
authors.affiliation: CESAM and Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal. fjpena@ua.pt
authors.forename: Francisco
authors.initials: F
authors.lastname: Pena-Pereira
authors.forename: Regina M B O
authors.initials: RM
authors.lastname: Duarte
authors.forename: Tito
authors.initials: T
authors.lastname: Trindade
authors.forename: Armando C
authors.initials: AC
authors.lastname: Duarte
mesh_terms: D017738:Alkanesulfonic Acids / Q000737:chemistry*; D000838:Anions / Q000737:chemistry*; D002412:Cations / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry*
chemical_list: D017738:Alkanesulfonic Acids; D000838:Anions; D002412:Cations; D058185:Magnetite Nanoparticles; D013501:Surface-Active Agents; C030641:alkylbenzyl sulfonic acid; D012822:Silicon Dioxide