Impact of aquatic humic substances on speciation and toxicity of arsenic and cobalt to Ceriodaphnia dubia

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MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorFederal Institute of Goiás (IFG)-
Autor(es): dc.creatorWatanabe, Cláudia Hitomi-
Autor(es): dc.creatorGontijo, Erik Sartori Jeunon-
Autor(es): dc.creatorDomingues, Murilo Teles-
Autor(es): dc.creatorFracácio, Renata-
Autor(es): dc.creatorRosa, André Henrique-
Data de aceite: dc.date.accessioned2025-08-21T22:44:51Z-
Data de disponibilização: dc.date.available2025-08-21T22:44:51Z-
Data de envio: dc.date.issued2023-07-29-
Data de envio: dc.date.issued2023-07-29-
Data de envio: dc.date.issued2022-12-31-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1007/s11356-023-27994-z-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/247483-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/247483-
Descrição: dc.descriptionHumic substances (HS) interact with trace metals such as As and Co, affecting their mobility and availability in aquatic systems. However, their combined effects on toxicity to aquatic organisms are not totally understood. The objective of this study was to evaluate the toxicity of Co(II) and As(III) to the water flea Ceriodaphnia dubia in the presence of HS, considering element speciation. Toxicity assays were performed in the presence and absence of HS at two different concentrations of As(III) (10 and 20 μg/L) and Co(II) (50 and 100 μg/L). The free As(III) and Co(II) (< 1 kDa, fraction most potentially bioavailable) in the test solutions were determined via ultrafiltration. While free Co(II) decreased by approximately 80% in the presence of HS, free As(III) decreased just by 1%. Despite the higher percentage of As(III) potentially bioavailable, the presence of HS reduced significantly the toxicity of As at 20 μg/L (no toxicity was observed at 10 μg/L). This was attributed to direct effects of HS such as hormesis, hormone-like effects of HS and/or formation of protective coating. These effects also stimulated the reproduction, including in the assays in the absence of As and Co. HS reduced the toxicity of Co(II) at both test concentrations. The results of this investigation support that HS should be considered when safe limits for As and Co are defined.-
Descrição: dc.descriptionSão Paulo State University (UNESP) Institute of Science and Technology, Avenida Três de Março 511, Alto da Boa Vista, Sorocaba-
Descrição: dc.descriptionFederal Institute of Goiás (IFG), Campus Formosa, Rua 64, s/n - Esq. c/Rua 11, Parque Lago, Formosa-
Descrição: dc.descriptionSão Paulo State University (UNESP) Institute of Science and Technology, Avenida Três de Março 511, Alto da Boa Vista, Sorocaba-
Idioma: dc.languageen-
Relação: dc.relationEnvironmental Science and Pollution Research-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectEcotoxicology-
Palavras-chave: dc.subjectMetal speciation-
Palavras-chave: dc.subjectNatural organic matter-
Palavras-chave: dc.subjectTrace metal-
Palavras-chave: dc.subjectUltrafiltration-
Título: dc.titleImpact of aquatic humic substances on speciation and toxicity of arsenic and cobalt to Ceriodaphnia dubia-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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