title: New sample treatment for determination of linear alkylbenzene sulfonate (LAS) in agricultural soils by liquid chromatography with fluorescence detection.
abstract: A new sample-treatment procedure has been developed for determination of total linear alkylbenzene sulfonate (LAS), i.e. homologues and isomers, in agricultural soil. The procedure involves two steps, ultrasound-assisted extraction of LAS from the samples with methanol then clean-up of the methanolic extracts and preconcentration of the LAS by solid-phase extraction on two adsorbent cartridges (SAX and C18). The ultrasound-assisted procedure reduces extraction time (10 min in contrast with 6-12 h for conventional Soxhlet extraction) and requires only small volumes of organic solvent. The effect of different variables interacting in the ultrasound-assisted extraction process was studied. Finally, separation and quantification of the homologues and isomers of LAS was performed by liquid chromatography with fluorescence detection (LC-FD). 2-Octylbenzenesulfonic acid sodium salt (Na-2ØC8-LAS) was used as internal standard. The proposed method was satisfactorily used for determination of LAS in agricultural soil samples from the fertile plain of Granada (Spain).
authors.affiliation: Research Group of Analytical Chemistry and Life Sciences, Department of Analytical Chemistry, Faculty of Sciences, University of Granada, Avda. Fuentenueva s/n, 18071, Granada, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Nimer
authors.forename: O
authors.initials: O
authors.lastname: Ballesteros
authors.forename: A
authors.initials: A
authors.lastname: Navalón
authors.forename: G
authors.initials: G
authors.lastname: Crovetto
authors.forename: C
authors.initials: C
authors.lastname: Verge
authors.forename: I
authors.initials: I
authors.lastname: López
authors.forename: J L
authors.initials: JL
authors.lastname: Berna
authors.forename: J L
authors.initials: JL
authors.lastname: Vílchez
mesh_terms: D000383:Agriculture; D017738:Alkanesulfonic Acids / Q000032:analysis*; D002853:Chromatography, Liquid / Q000379:methods*; D012987:Soil / Q000032:analysis*; D052616:Solid Phase Extraction; D013050:Spectrometry, Fluorescence / Q000379:methods*; D014465:Ultrasonics
chemical_list: D017738:Alkanesulfonic Acids; D012987:Soil; C030641:alkylbenzyl sulfonic acid