Ecotoxicological evaluation of pig slurry

Swine sewage could be source of nutrients and pollutants. This work estimat es the environmental risk in nine samples from different farm treatment sys tems based on the evaluation of their effects in Daphnia magna acute test, and on the assessment of Cu, Zn and ammonia as main contributors. NH3 and C u were responsible for LC50 results (1-5% of dilution). Organic compounds w ere quantified through several extraction methods (SPMDs, SPE and solvent e xtraction). A more exhaustive extraction was performed in an additional sam ple, which showed indole and phenol recoveries much higher than the previou s ones. This method also includes PCBs (430 ppb) and fatty acids (congruent to 150 ppm) quantification. (C) 2000 Elsevier Science Ltd. All rights rese rved.