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Screening method for linear alkylbenzene sulfonates in sediments based on water Soxhlet extraction assisted by
S Morales-Muñoz1, J L Luque-García, Luque de Castro
1Department of Analytical Chemistry, University of Córdoba, Marie Curie Building, Annex C-3, Campus of Rabanales, E-14071 Córdoba, Spain.
Abstract:
A screening method for linear alkylbenzene sulfonates (LAS) in sediments has been developed. Soxhlet extraction with water assisted by focused microwaves provides recoveries better (>90%) than obtained by conventional Soxhlet extraction (70-80%). Coupling of the extractor with an on-line preconcentration/derivatization/detection manifold through a flow injection (FI) interface allows a fully automated screening approach. A yes/no answer can be obtained in less than 2 h (for the whole analytical process), a short time compared with the at least 24 h of Soxhlet extraction (without final detection). Due to the use of water as leaching agent, the proposed method is environmentally friendly.
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