Trace determination of linear alkylbenzene sulfonates : application in artificially polluted soil-carrots system

Caroline C. Sablayrolles (1, 2) , Mireille Montréjaud-Vignoles (1) , Jérôme Silvestre (3, 4) , Michel Treilhou (5)

1 CAI - Chimie Agro-Industrielle
2 Veolia Environnement (FRANCE)
3 LEFE - Laboratoire Ecologie Fonctionnelle et Environnement
4 ENSAT - École nationale supérieure agronomique de Toulouse
5 LCBI - Laboratoire de chimie et biochimie des interactions

Surfactants are widely used in household and industrial products. The risk of incorporation of linear alkylbenzene sulfonates (LAS) from biosolids, wastewater, and fertilizers land application to the food chain is being assessed at present by the European Union. In the present work, a complete analytical method for LAS trace determination has been developed and successfully applied to LAS (C10–C13) uptake in carrot plants used as model. These carrots were grown in soil with the trace organics compounds added directly into the plant containers in pure substances form. LAS trace determination (μg kg−1 dry matter) in carrots samples was achieved by Soxtec apparatus and high-performance liquid chromatography-fluorescence detection. The methodology developed provides LAS determination at low detection limits (5μg kg−1 dry matter) for carrot sample (2 g dry matter) with good recoveries rate (>90%). Transfer of LAS has been followed into the various parts of the carrot plant. LAS are generally found in the carrot leaves and percentage transfer remains very low (0.02%).

Mots clés: linear determination; alkylbenzene sulfonates; polluted soil; carrots system

Domaines: Ingénierie des aliments; Génie des procédés

Caroline C. Sablayrolles, Mireille Montréjaud-Vignoles, Jérôme Silvestre, Michel Treilhou. Trace determination of linear alkylbenzene sulfonates : application in artificially polluted soil-carrots system. International Journal of Environmental Analytical Chemistry, 2009, 2009 (404836), pp.1-6. ⟨10.1155/2009/404836⟩. ⟨hal-02657477⟩