Superheated water extraction of linear alquilbenzene sulfonates from sediments with on-line preconcentration/derivatization/detection

A fully automated screening method based on superheated water extraction of linear alquilbenzene sulfonates from sediments prior to preconcentration/derivatization/detection is presented. A multivariate optimization of both the extraction step and derivatization step was performed. Superheated water extraction was compared with conventional Soxhlet extraction obtaining better recoveries (>95% versus 80-86%) and a drastic reduction of the extraction time (50 min versus 24 h) by the proposed method. The on-line coupling of the extractor with a preconcentration/derivatization/detection manifold through a flow-injection interface has permitted to obtain a fully automated screening approach. Moreover, this research constitutes an environmentally friendly method due to the use of water as extractant instead of an organic solvent.