Resumo

SERRANO, M; RESTREPO, R  e  VILLA, G. EVALUACIÓN ECOTOXICOLÓGICA DE LA INFLUENCIA DE LOS VERTIMIENTOS DEL CAMPO DE PRODUCCIÓN LA CIRA-INFANTAS (GCO) SOBRE DOS CUERPO RECEPTORE. C.T.F Cienc. Tecnol. Futuro [online]. 1999, vol.1, n.5, pp.101-112. ISSN 0122-5383.

Application of a methodology to determine acute toxicity and toxic charge of the six effluents of Ecopetrol's production field La Cira-lnfantas, as well as to assess water quality of receptor streams (La Cira and Reposo), through toxicity test with three native organisms from the region: an algae (Scenedesmus subspicatus), a macrophite (Lemna aequinoctialis) a cladoceran (Moinodaphnia macleayi) and Daphnia pu/ex as the reference organism. The toxic potential of the effluents, by conducting additional bioassays with (BaC⁺² y NaCI), was also determined since high concentrations of (Ba⁺² and Cl^-;) are present in the effluents. All tested organisms showed sensitivity to the reference toxicant (K₂Cr₂O₇), and met international criteria fortheir use as bioindicators in ecotoxicology studies. The response of the bioindicators to the effluents depended on each organism; however effluents 2 and 3, the more highly contaminated, presented the highest toxicities.

Palavras-chave : ecotoxicology; acute; lethal concentration 50 (CL₅₀); effective concentration 50 (CE₅₀); bioassays; receptor bodies; pollution; water production.

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