Computer Science
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48.1513n&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 48, Issue 7, pp.1513-1522
Computer Science
29
Scientific paper
The partitioning of radioactive trace elements between seawater and particulate matter from surface sediments and sediment traps was investigated in laboratory experiments. For the elements Na, Zn, Se, Sr, Cd, Sn, Sb, Cs, Ba, Hg, Th and Pa (group I) constant distribution coefficients ( K d ) were found after a few days of equilibration, whereas the elements Be, Mn, Co and Fe (group II) showed an increasing K d over the whole time of observation of 108 days. The time dependence of K d is described by an adsorption-desorption equilibrium (group I elements), followed by a lattice transport reaction step (group II elements). The reaction rate constants are compared to Mn oxidation rates and to adsorption rate constants derived from in situ measurements of the U / Th disequilibrium as available from literature.
Li Yuan-Hui
Nyffeler Urs P.
Santschi Peter H.
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