New sample treatment for determination of linear alkylbenzene sulfonate (LAS) in agricultural soils by liquid chromatography with fluorescence detection.
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).
Nimer
M
M
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.
Ballesteros
O
O
Navalón
A
A
Crovetto
G
G
Verge
C
C
López
I
I
Berna
J L
JL
Vílchez
J L
JL
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
D017738:Alkanesulfonic Acids; D012987:Soil; C030641:alkylbenzyl sulfonic acid