title: Determination of linear alkylbenzenesulfonates (LASs) in sewage sludge and carrots by capillary electrophoresis--UV detection.
abstract: A method based on capillary zone electrophoresis has been proposed in order to separate and determine four groups of linear alkylbenzenesulfonates in sewage sludge and carrots. The separation was carried out in a silica capillary of 50 cm x 75 microm at 25 kV using a sodium borate buffer solution of 100 mM which includes 40% of acetonitrile. The detection was made by UV-Vis diode array detector. Precision, accuracy, linearity, detection and quantification limits of the method were determined. Finally, the method was applied to analyse samples of sewage sludge from a wastewater depuration station in Crispijana (Alava, Spain) and carrots sown in soils spiked with this sludge. In this case, it is necessary to carry out an extraction step for its determination. The extraction was carried out by solid phase extraction with a C18 cartridge. The solid phase extraction (SPE) parameters were also optimized and the recoveries were calculated. Samples of sewage sludge were analysed weekly during two years and, in all cases, results under legal limits for their use in agriculture were obtained.
authors.affiliation: Department of Analytical Chemistry, Pharmacy Faculty, University of the Basque County, Alava, Spain.
authors.forename: Rebeca
authors.initials: R
authors.lastname: Alzola
authors.forename: Begoña
authors.initials: B
authors.lastname: Pons
authors.forename: David
authors.initials: D
authors.lastname: Bravo
authors.forename: Adela
authors.initials: A
authors.lastname: Arranz
mesh_terms: D018552:Daucus carota / Q000737:chemistry*; D019075:Electrophoresis, Capillary / Q000379:methods*; D012722:Sewage / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet / Q000379:methods*
chemical_list: D012722:Sewage