|
(79-09) Ecotoxicological characterisation of solid residues. Piga, Javier*,1, Gascó, Pilar1, Martínez, Ma Antonia1, Azparren, José1, García de Yébenes, Pilar1, 1 Instituto Nacional de Toxicología, Madrid, Spain ABSTRACT- The National Institute of Toxicology, as an Advisory Technical Centre of the Justice Administration has responsibility for cases in which ecological offences are suspected. Spanish environmental laws do not contain any regulations in which the maximum acceptable concentrations of chemicals are established in order to classify dangerous residues. References to toxic limits are mentioned in the regulation concerned with the characterisation of dangerous and hazardous residues. It includes the standardised biological assays of the Daphnia magna acute test and the bioluminiscence inhibition test with Vibrio fischeri . Herein, we present the results of the analysis of 20 solid industrial residues (wastes of a former pesticides manufacturing plant) and its lixiviates. The scope of the research comprises the following physical-chemical analysis and toxicity studies: pH, metals (Ba, Cd, Cu, Cr, Hg, Ni, Pb, Zn), non-metals (As, Se), Lindane, HCH and TCB isomers. The two acute toxicity studies were carried out on the lixiviate (EPA extraction procedure) obtained from the 20 mentioned residues: the bioluminiscence inhibition toxicity test using Vibrio fischeri, and the acute toxicity test with Daphnia magna. None of the residues could be characterised as dangerous due to their toxicity values and generally there was no correlation between supposed toxic substances contained in the solid residues and the two mentioned toxicity studies. The results confirm that both chemical levels and toxicity testing are essential to control residues and that decision makers should implement regulations in that way. Key words: Bioassays, Residues, Characterisation |
