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Título: | Silver speciation in liver of marine mammals by synchrotron X-ray absorption fine structure and X-ray fluorescence spectroscopies |
Autor: | Nakazawa, Emiko Ikemoto, Tokutaka Hokura, Akiko Terada, Yasuko Kunito, Takashi Yamamoto, Takahito Yamada, Tadasu K. Weber Rosas, Fernando Cesar Fillmann, Gilberto Tanabe, Shinsuke Nakai, Izumi |
Palavras-chave: | Silver Chemical Analysis Dolphin Marine Environment Nonhuman Priority Journal Stenella Whale X Ray Absorption Spectroscopy Animal Dolphins Female Liver Male Selenium Silver Spectrometry, X-ray Emission Sulfur Water Pollutants, Chemical Whales X Ray Absorption Spectroscopy Berardius Bairdii Feresa Feresa Attenuata Mammalia Phocoenoides Dalli Pontoporia Blainvillei Stenella (cetacea) Stenella Coeruleoalba Ziphiidae |
Data do documento: | 2011 |
Revista: | Journal of Environmental Monitoring |
É parte de: | Volume 13, Número 6, Pags. 1678-1686 |
Abstract: | The chemical form of Ag in the livers of five species of marine mammals was examined using X-ray absorption fine structure (XAFS) and X-ray fluorescence (XRF) spectroscopies. The XAFS analysis suggested that Ag2Se was present in the livers of the Franciscana dolphin (Pontoporia blainvillei), Dall's porpoise (Phocoenoides dalli), and Baird's beaked whale (Berardius bairdii), whereas Ag2S was present in the livers of the striped dolphin (Stenella coeruleoalba) and pygmy killer whale (Feresa attenuata). XRF spectroscopy results revealed that the distribution patterns of Ag and Se in a thin section of the liver of the Franciscana dolphin were the same; this also implied that Ag was associated with Se in the liver. Thus, the interaction of Ag with Se or S may offer significant protection against the toxicity of Ag in marine mammals. The formation of either Ag2Se or Ag2S might depend on the Hg levels in the liver. Ag2Se was observed in liver samples with relatively high Ag/Hg ratio, whereas liver samples with low Ag/Hg ratio contained Ag2S. © The Royal Society of Chemistry. |
DOI: | 10.1039/c1em10115c |
Aparece nas coleções: | Artigos |
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