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Development of an analytical procedure to study linear alkylbenzenesulphonate (LAS) degradation in sewage
L Comellas1, J L Portillo, M T Vaquero
1Secció de Cromatografia, C.E.T.S. Institut Químic de Sarrià (Universitat Ramon Llull), Barcelona, Spain.
Abstract:
A procedure for determining linear alkylbenzenesulphonates (LASs) in sewage sludge and amended soils has been developed. Extraction by sample treatment with 0.5 M potassium hydroxide in methanol and reflux was compared with a previously described extraction procedure in Soxhlet with methanol and solid sodium hydroxide in the sample. Repeatability results were similar with savings in extraction time, solvents and evaporation time. A clean-up method involving a C18 cartridge has been developed. Analytes were quantified by a reversed-phase HPLC method with UV and fluorescence detectors. Recoveries obtained were higher than 84%. The standing procedure was applied to high doses of sewage sludge-amended soils (15%) with increasing quantities of added LASs. Degradation data for a 116-day period are presented.