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BIBTEX RIS

Toxicidade do Sulfato de Cobre ao Mexilhão Dourado, Limnoperna fortunei (Dunker, 1857), em Água Bruta

2009; Volume: 4; Issue: 1 Linguagem: Inglês

10.5132/jbse.2009.01.006

ISSN

2317-9643

Autores

Miriam de Freitas Soares Soares, Daniel Pereira, Cláudia Portes Santos, M. C. D. Mansur, Marçal Pires, J. O. Breintenbach, C. Grespan,

Tópico(s)

Analytical chemistry methods development

Resumo

Bench tests were performed in order to evaluate copper sulphate toxicity for golden mussels (Limnoperna fortunei), aiming to discover its lethal dose (CE50 and CE95 48 h) for mollusk control. Copper residue levels were also evaluated within the tested water volumes, shells and mollusk tissues through a flame atomic absorption spectrophotometry, (LD 0.0012 mg L–1 for copper). Water and golden mussel specimen samples were gathered from the Guaíba Lake, in the city of Porto Alegre, Rio Grande do Sul State, Brazil. L. fortunei was exposed to 1.24; 2.33; 3.88; 5.43; 7.76; 10.08; 13.19 and 15.50 mg L–1 copper concentrations through analogous copper sulphate solutions (CuSO4.5H2O). Test organisms (1.8-2 mm in length) were acclimatized (20 °C ± 1, 24 hours) in aquariums with air pumps and subjected to acute tests (48 hours). For each performed test, control groups (unexposed to copper sulphate) were submitted to the same conditions. The average Cu concentration, the standard error and minimum and maximum values obtained from golden mussel shells and tissues were 3.502 ± 0.056 (3.240-3.970) and 27.560 ± 2.406 (20.360-40.700) mg kg–1, respectively. The average, minimum and maximum CE50 and CE95 values in tested Cu concentrations were 2.16 (1.70 and 2.65) and 4.86 (3.97 and 6.47) mg L–1. The tested concentrations were responsible for 90.8% of the mortality. Lethal concentrations verified in this study are above those indicated for golden mussel control in water inlets supplying the city of Porto Alegre (0.5 to 2.0 mg L–1). According to statistic tests concerning behavioral and lethality indicators, the mussels reduced their filtration activities, their mobility and their reaction to contact after being exposed to copper, presenting a lethargic state.

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