Physics
Scientific paper
May 1970
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970gecoa..34..553r&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 34, Issue 5, pp.553-567
Physics
4
Scientific paper
Neutron activation and direct instrumental analysis utilizing multi-dimensional gamma-ray spectrometry was employed to measure the concentrations and variations of cobalt in oceanic waters. The cobalt concentrations observed in this work are much lower than most previously reported values. Surface concentrations in the North Central Pacific Ocean averaged about 10 nanograms/liter. Tropical Northeast Pacific Ocean waters and Oregon coastal waters averaged about 20 and 46 ng Co/l., respectively, after a few high values suspected of contamination were omitted. Tropical North Atlantic Ocean waters averaged approximately 25 ng Co/l., while Bering Sea and Mediterranean Sea waters averaged approximately 30 and 20 ng Co/l., respectively. Various coastal areas throughout the world contained slightly higher concentrations. The distribution of cobalt in the oceans is highly variable. Calculations show that assimilation of cobalt by phytoplankton and marine organisms cannot fully account for the observed variations, and the heterogeneous distribution of cobalt throughout the oceans is, for the most part, inexplicable.
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