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 methanoli...

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Bibliographic Details
Published in:Analytical and bioanalytical chemistry 2007-03, Vol.387 (6), p.2175-2184
Main Authors: Nimer, M, Ballesteros, O, Navalón, A, Crovetto, G, Verge, C, López, I, Berna, J L, Vílchez, J L
Format: Article
Language:English
Subjects:
Agriculture
Alkanesulfonic Acids - analysis
Chromatography, Liquid - methods
Soil - analysis
Solid Phase Extraction
Spectrometry, Fluorescence - methods
Ultrasonics
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Summary: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).
ISSN:1618-2642
1618-2650
DOI:10.1007/s00216-006-1069-y