Restriction of sulfate reduction on the bioavailability and toxicity of trace metals in Antarctic lake sediments.
Mar Pollut Bull
; 151: 110807, 2020 Feb.
Article
em En
| MEDLINE
| ID: mdl-32056601
ABSTRACT
In this study, Acid-Volatile Sulfur (AVS), trace metals Cu, Cd and Zn and their chemical speciation based on BCR-sequential and simultaneous extraction (SEMs) in Antarctic lake sediments (Y2-1 and YO) were analyzed to investigate the restriction of sulfate reduction on the bioavailability and toxicity of trace metals. Much higher trace metals in Y2-1 indicating a primary source from penguin guano. The main chemical speciation of Cu and Cd in Y2-1 was their oxidizable fraction in contrast to those of weak-acid extraction in YO. Lower ratio of ΣSEM/AVS in Y2-1 indicating less toxicity of the trace metals. The main chemical speciation of Cd in Y2-1 was their oxidizable fraction in contrast to that exchangeable fraction in penguin guano, indicating that although amounts of Cd was transported from marine to lake by penguins, strong sulfate reduction in ornithogenic sediments restricts the bioavailability and toxicity of Cd through the formation of insoluble sulfide.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Sulfatos
/
Poluentes Químicos da Água
/
Monitoramento Ambiental
/
Metais Pesados
Limite:
Animals
Idioma:
En
Revista:
Mar Pollut Bull
Ano de publicação:
2020
Tipo de documento:
Article
País de afiliação:
China