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Issue 6, 2011
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Silver speciation in liver of marine mammals by synchrotron X-ray absorption fine structure and X-ray fluorescence spectroscopies

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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.

Graphical abstract: Silver speciation in liver of marine mammals by synchrotron X-ray absorption fine structure and X-ray fluorescence spectroscopies

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Publication details

The article was received on 08 Feb 2011, accepted on 18 Mar 2011 and first published on 14 Apr 2011


Article type: Paper
DOI: 10.1039/C1EM10115C
Citation: J. Environ. Monit., 2011,13, 1678-1686
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    Silver speciation in liver of marine mammals by synchrotron X-ray absorption fine structure and X-ray fluorescence spectroscopies

    E. Nakazawa, T. Ikemoto, A. Hokura, Y. Terada, T. Kunito, T. Yamamoto, T. K. Yamada, F. C. W. Rosas, G. Fillmann, S. Tanabe and I. Nakai, J. Environ. Monit., 2011, 13, 1678
    DOI: 10.1039/C1EM10115C

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