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(W/EH048) Deriving site-specific water quality criteria for the surfactant (LAS) in Southwest of Spain. Carmen, Garrido1, Jose Antonio, Perales1, Jose Marķa, Quiroga1, Enrique, Nebot1, Diego, Sales1, 1 ABSTRACT- The present study summarises the results obtained from an approach to deriving site-specific water quality criteria for the surfactant linear alkylbencene sulphonate (LAS). In the development of bioassays, dilution water were collected from three sources: (a) synthetic (reconstituted) seawater (USEPA, 1984); (b) natural water from littoral zones in Gulf of Cadiz (Southwest Spain); and (c) test medium from a biodegradation test of LAS (OPPTS 835-3160). The test organisms and the bioassays were: (1) 24 and 48-h toxicity test with the crustacean Artemia salina and the rotifer Brachionus plicatilis; (2) algae growth inhibition test with Chaetoceros gracillis, Nannochloropsis gaditana, Tetraselmis suecica, Isochrysis galbana and Dunaliella salina; and (3) inhibition of luminescence of Vibrio fischery. For deriving the ecotoxicological value, a final acute (FAV), final chronic (FCV) and final plant (FPV) for each dilution water was calculated, as well as the effect of the dilution water was included. Key words: surfactants, water quality, ecotoxicity, legislation |
