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Avaliação prévia da toxicidade de um efluente simulado derivado de petróleo sobre Promysis atlantica (Crustácea, Mysidacea)

Prelliminary study on the toxiclty of a simulated effluent derived from petroleum on Promysis atlantica (Cruatacea, Mysldacea)

Resumos

Foram realizados experimentos para avaliar previamente o potencial tóxico de duas amostras de efluente derivado de petróleo a ser lançado no canal de S. Sebastião, através de um emissário submarino que está sendo construído no Terminal Marítimo "Almirante Barroso" (TEBAR). As amostras (denominadas Efluente-A e -B) foram fornecidas pela PETROBRÁS e foram testadas com jovens e adultos de Promysis atlântica (Crustacea, Mysidacea). Em relação ao Efluente-A, concentrações entre 1% e 5% alteram significativamente a taxa de mortalidade dos animais em curto intervalo de tempo (24-96 horas). No caso do Efluente-B concentrações de 0,075% (96 horas) estão no limite máximo de exposição que não afeta a sobrevivência dos jovens da mesma espécie. Os testes demonstraram serem as duas amostras (Efluentes A e B) bastante diferentes uma da outra, sendo a segunda cerca de dez vezes mais tóxica que a primeira. Além disso, a toxicidade dos efluentes varia também em função do armazenamento. Outros possíveis efeitos dos efluentes sobre o ecossistema são discutidos.

Mysidacea; Promysis atlântica; toxicologia marinha; toxicidade; petróleo


Preliminary experiments were carried out to estimate the potential toxicity of an effluent derived from petroleum to be dumped into São Sebastião channel through a submarine emissary which is being built at the Maritime Terminal "Almirante Barroso" (TEBAR). Two simulated samples of this effluent (denominated A and B) were supplied by PETROBRÁS. The toxicity of sample A was tested with young and adult Promysis atlántica (Crustacea, Mysidacea) and the toxicity of sample B only with young individuals of the same species. In relation to Effluent-A, concentrations between 1% and 5% increase significantly the rate of mortality of animals in short term tests (24-96 hrs). The results also indicated that, in this case, adults are less resistant than youngs. Concentrations of 0.075% of Effluent-B are at the maximum limits of no effect observation for short term expositions of young animals (96 hrs). The two effluent samples are different from each other. Both of them are very toxic, but the second is about 10 times more toxic than the first one. The toxicity of the samples also varies in function of time of storage. It seems that this variation is not predictable as the results indicated that the toxicity increased with storage for sample A and diminished for sample B. Other possible effects of the effluent on the ecosystem are discussed.

Mysidacea; Promysis atlântica; marine toxicology; toxicity; petroleum


ARTIGOS

Avaliação prévia da toxicidade de um efluente simulado derivado de petróleo sobre Promysis atlantica (Crustácea, Mysidacea)

Prelliminary study on the toxiclty of a simulated effluent derived from petroleum on Promysis atlantica (Cruatacea, Mysldacea)

Phan Van Ngan; Vicente Gomes; Maria José de Arruda Campos Rocha Passos

Instituto Oceanográfico da Universidade de São Paulo (Caixa Postal 66149, 05389-970, São Paulo, SP, Brasil)

RESUMO

Foram realizados experimentos para avaliar previamente o potencial tóxico de duas amostras de efluente derivado de petróleo a ser lançado no canal de S. Sebastião, através de um emissário submarino que está sendo construído no Terminal Marítimo "Almirante Barroso" (TEBAR). As amostras (denominadas Efluente-A e -B) foram fornecidas pela PETROBRÁS e foram testadas com jovens e adultos de Promysis atlântica (Crustacea, Mysidacea). Em relação ao Efluente-A, concentrações entre 1% e 5% alteram significativamente a taxa de mortalidade dos animais em curto intervalo de tempo (24-96 horas). No caso do Efluente-B concentrações de 0,075% (96 horas) estão no limite máximo de exposição que não afeta a sobrevivência dos jovens da mesma espécie. Os testes demonstraram serem as duas amostras (Efluentes A e B) bastante diferentes uma da outra, sendo a segunda cerca de dez vezes mais tóxica que a primeira. Além disso, a toxicidade dos efluentes varia também em função do armazenamento. Outros possíveis efeitos dos efluentes sobre o ecossistema são discutidos.

Descritores: Mysidacea, Promysis atlântica, toxicologia marinha, toxicidade, petróleo.

ABSTRACT

Preliminary experiments were carried out to estimate the potential toxicity of an effluent derived from petroleum to be dumped into São Sebastião channel through a submarine emissary which is being built at the Maritime Terminal "Almirante Barroso" (TEBAR). Two simulated samples of this effluent (denominated A and B) were supplied by PETROBRÁS. The toxicity of sample A was tested with young and adult Promysis atlántica (Crustacea, Mysidacea) and the toxicity of sample B only with young individuals of the same species. In relation to Effluent-A, concentrations between 1% and 5% increase significantly the rate of mortality of animals in short term tests (24-96 hrs). The results also indicated that, in this case, adults are less resistant than youngs. Concentrations of 0.075% of Effluent-B are at the maximum limits of no effect observation for short term expositions of young animals (96 hrs). The two effluent samples are different from each other. Both of them are very toxic, but the second is about 10 times more toxic than the first one. The toxicity of the samples also varies in function of time of storage. It seems that this variation is not predictable as the results indicated that the toxicity increased with storage for sample A and diminished for sample B. Other possible effects of the effluent on the ecosystem are discussed.

Descriptors: Mysidacea, Promysis atlântica, marine toxicology, toxicity, petroleum.

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Full text available only in PDF format.

Agradecimentos

Agradecemos ao Instituto Oceanográfico da USP e à FUNDESPA - Fundação de Estudos e Pesquisas Aquáticas, pelo apoio concedido, pelas instalações e coordenação da parte financeira do projeto. À PETROBRÁS, pelo financiamento do trabalho, pelo fornecimento das amostras do efluente e pela autorização em divulgar os resultados. À Profa Dra Yoko Wakabara, pela identificação dos misidáceos. Às Profas Dras Elizabeth Aidar e Eduinetty Ceci P. M. de Sousa, pela leitura do manuscrito. A todo o pessoal do nosso laboratório pelo inestimável auxílio.

(Manuscrito recebido 15 julho 1993; revisto 30 novembro 1994; aceito 22 dezembro 1994)

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Datas de Publicação

  • Publicação nesta coleção
    14 Maio 2012
  • Data do Fascículo
    1994

Histórico

  • Recebido
    15 Jul 1993
  • Revisado
    30 Nov 1994
  • Aceito
    22 Dez 1994
Instituto Oceanográfico da Universidade de São Paulo Praça do Oceanográfico, 191, 05508-120 São Paulo SP Brasil, Tel.: (55 11) 3091 6513, Fax: (55 11) 3032 3092 - São Paulo - SP - Brazil
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