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http://hdl.handle.net/1843/76843
Type: | Artigo de Periódico |
Title: | Arsenic toxicity to cladocerans isolated and associated with iron: implications for aquatic environments |
Authors: | Suellen Cristina Moreira de Sales Arnola Cecilia Rietzler Marcela M. Ribeiro |
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. |
Abstract: | Arsênio é um ametal amplamente distribuído na natureza e é distribuído e conhecido por sua elevada toxicidade. Muitos estudos tentaram elucidar o metabolismo do arsênio na célula e seu impacto para plantas, animais e à saúde humana. Em meio aquoso, arsênio inorgânico é mais comum e seu estado de oxidação (As III e As V) depende de condições físicas e químicas do ambiente. O objetivo deste estudo foi avaliar a toxicidade do arsênio a Daphnia similis e Ceriodaphnia silvestrii, isolado e associado a ferro. Os resultados demonstraram diferenças na toxicidade de As III e As V para ambas as espécies. Os valores médios da Concentração efetiva (CE50) foram 0.45 mg L-1 (As III) e 0.54 mg L-1 (As V) para D. similis, e 0.44 mg L-1 (As III) e 0.69 mg L-1 (As V) para C. silvestrii. Entretanto, o valor médio da CI25 para As V foi 0.59 mg L-1, indicando que C. silvestrii possui mecanismos para reduzir toxicidade de arsênio. Por outro lado, quando associado a ferro nas concentrações de 0.02 e 2.00 mg L1, os valores de CE50 decresceram tanto para D. similis (0.34 e 0.38 mg L-1) quanto para C. silvestrii (0.37 e 0.37 mg L-1), demonstrando efeitos sinérgicos entre as substâncias. |
Subject: | Toxicologia ambiental Metais Toxicidade aguda Arsênio |
language: | eng |
metadata.dc.publisher.country: | Brasil |
Publisher: | Universidade Federal de Minas Gerais |
Publisher Initials: | UFMG |
metadata.dc.publisher.department: | ICB - INSTITUTO DE CIÊNCIAS BIOLOGICAS |
Rights: | Acesso Aberto |
metadata.dc.identifier.doi: | https://doi.org/10.1590/0001-3765201620140670 |
URI: | http://hdl.handle.net/1843/76843 |
Issue Date: | 2016 |
metadata.dc.url.externa: | https://www.scielo.br/j/aabc/a/7XmVZT6zrLPyxvTSXSdnFRs/?lang=en# |
metadata.dc.relation.ispartof: | Anais da Academia Brasileira de Ciências |
Appears in Collections: | Artigo de Periódico |
Files in This Item:
File | Description | Size | Format | |
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Arsenic toxicity to cladocerans isolated and associated with iron_ implications for aquatic environments.pdf | 515 kB | Adobe PDF | View/Open |
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