Estudo comparativo da sensibilidade de dois organismos expostos a efluentes líquidos. / Comparative study of the sensitivity of two organisms exposed to effluents

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

15/12/2010

RESUMO

Given the multiplicity of actions caused by the interaction of chemical agents with possible damage to biota by effluent, the most effective strategy is the integrated use of physical, chemical and ecotóxicological assessment and forecast of environmental risk. In this sense, ecotóxicological tests are important means of environmental monitoring in order to preserve the aquatic environment. The main objective of this study was to implement the test method with Daphnia similis according to ABNT NBR 12713: 2009. Moreover, the objective was to evaluate the relative sensitivity of two organisms-tests (Daphnia similis and Danio rerio) effluents from various industries such as industry of food, beverage, pharmaceutical, paper, petrochemical, effluent from the pickling of metals, and slurry from three different landfills (Sao Paulo, Rio de Janeiro and Rio Grande do Sul) evaluating the results and physical-chemical limits of the in Rio de Janeiro (NT 213, NT 202 and 205 DZ). Thus, we intend to see if the limits are not sufficient to confer acute ecotoxicity to water body. Treated effluent from industry of food, beverage, pharmaceutical and paper, showed no acute ecotoxicity neither Daphnia similis nor the Danio rerio. The test with the effluent from the pickling of metals performed very toxic to both organisms, with LC (I) 50; 48h equals 39.99% and EC (I) 50; 48h equal to 11.87%. The effluent from the petrochemical industry A showed ecotoxicity, even when all its parameters analyzed were in accordance with existing laws. The landfill leachate coming from the metropolitan region of Sao Paulo, in general, presented as being the most toxic of the three landfills. And the treated leachate from the landfill that came from Rio Grande do Sul, proved to be the least toxic of the three, particularly when it came to Daphnia similis. In general, all effluent were within the limits of the law (DZ 205 and NT 202), showed no ecotoxicity to organisms under study.

ASSUNTO(S)

leachate daphnia similis danio rerio efluentes chorume legislação engenharias daphnia similis danio rerio effluent legislation

ACESSO AO ARTIGO

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