Selenium redox chemistry at GEOSECS I re-occupation

Details Selenium redox chemistry at GEOSECS I re-occupation Selenium redox chemistry at GEOSECS I re-occupation

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..49..102m&link_type=abstract

Earth and Planetary Science Letters, Volume 49, Issue 1, p. 102-108.

Computer Science

4

Scientific paper

The distribution in profile of the two oxidation states of selenium, SeIV and SeVI has been determined at GEOSECS I. The ratio SeIV/SeVI increases from 0.1 in the surface layer to a maximum of 0.6 at 1300 m, the deepwater value being 0.55. The ranges are 50-800 pmol/kg for SeIV and 500-1500 pmol/kg for SeVI. The element is unique in the presence of both oxidation states at comparable levels throughout the water column. Model calculations suggest that this is due to either incorporation of SeIV, produced by reduction of SeVI in the mixed layer, into refractory carrier phase resulting in a high IV/VI ratio in the deep water or an unique redox cycle involving oxidation of SeIV in the mixed layer and reduction of SeVI in the deep water.

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