Data/hora: 11/06/2024 17:36:30

Provedor de dados: | 42
País: | Brazil
Título: | Arsenic toxicity to cladocerans isolated and associated with iron: implications for aquatic environments
Autores: | SALES,SUELLEN C.M.; RIETZLER,ARNOLA C.; RIBEIRO,MARCELA M.
Data: | 2016-01-01
Ano: | 2016
Palavras-chave: | Aquatic ecotoxicology; Metals; Acute and chronic effects; D. similis; C. silvestrii.
Resumo: | ABSTRACT Arsenic is an ametal ubiquitous in nature and known by its high toxicity. Many studies have tried to elucidate the arsenic metabolism in the cell and its impact to plants, animals and human health. In aqueous phase, inorganic arsenic is more common and its oxidation state (As III and As V) depends on physical and chemical environmental conditions. The aim of this study was to evaluate toxicity of arsenic to Daphnia similis and Ceriodaphnia silvestrii, isolated and associated with iron. The results showed differences in toxicity of As III and As V to both species. Effective concentration (EC50) mean values were 0.45 mg L-1 (As III) and 0.54 mg L-1 (As V) for D. similis, and 0.44 mg L-1 (As III) and 0.69 mg L-1 (As V) for C. silvestrii. However, As V IC25 mean value was 0.59 mg L-1, indicating that C. silvestrii has mechanisms to reduce arsenic toxicity. On the other hand, when associated with iron at 0.02 and 2.00 mg L-1, EC50 values decreased for D. similis (0.34 and 0.38 mg L-1) as well as C. silvestrii (0.37 and 0.37 mg L-1), showing synergistic effect of these substances.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200539
Editor: | Academia Brasileira de Ciências
Relação: | 10.1590/0001-3765201620140670
Formato: | text/html
Fonte: | Anais da Academia Brasileira de Ciências  v.88 suppl.1 2016
Fonte: | info:eu-repo/semantics/openAccess