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Trace-metals in fulvic and humic acids from modern organic-rich sediments

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  • Chemistry
  • Medicine


Trace metals in fulvic and humic acids from modern organic-rich sediments OCEANOLOGICA ACTA 1985- VOL. 8 - N° 2 ~ -----~- Trace metals in fulvie Trace metals Humic acids Fulvie acids Diatom ooze Peruvian shelf and humic acids from modern organic-rich sediments Métaux-traces Acides humiques Acides fulviques Boues à diatomées Plateau continental péruvien ABSTRACT RÉSUMÉ S.E. Calvert a, S. Mukherjee a •, R.J. Morris b a Department of Oceanography, The University of British Columbia, 6270 University Boulevard, Vancouver, B.C. V6T IW5, Canada. b lnstitute of Oceanographie Sciences, Wormley, Godalming, Surrey GUS 5UB, UK. • Present address: Mineral Physics Division, C.H.S., Geological Survey of India, 29, J.L. Nehru Road, Calcutta 700016, India. Received 12/12/83, in revised form 25/6/84, accepted 5/7/84. The molecular size fractions of humic and fulvie acids from an organic-rich diatom ooze on the Peruvian shelf have been analysed for major and minor elements by X-ray emission methods. High molecular weight ( > 300,000) humic fractions show marked enrichments in Cr, Cu, Mo, Ni and Zn compared with the bulk sediments; high molecular weight fulvie acid fractions show enrichments in Cr and Cu. In contrast, Ba, Mn, Rb, Sr and Zr, elements residing principally in aluminosilicates, are ail enriched in the residues from the organic extractions. Although the amounts of the metals accounted for by the various humic and fulvie acid fractions fall significantly short of the totals in the bulk sediment, the relatively mild extraction conditions used here have allowed a better mass balance than that achieved earlier using a more conventional, harsher extraction scheme. The presence of sorne metals having biochemical rotes in relatively high concentration in the high molecular weight humic and fulvie acid fractions is possibly due to their delivery to the sediment in organic association and their incorporation into the high molecular weight polymers formed

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