Kinetics of trace element uptake by marine particles

Details Kinetics of trace element uptake by marine particles Kinetics of trace element uptake by marine particles

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52..567j&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 52, Issue 2, pp.567-577

Computer Science

Sound

13

Scientific paper

Removal of four radiotracers ( 46 Sc, 113 Sn, 65 Zn and 230 Th) by natural particulates in Puget Sound seawater was carefully studied under controlled laboratory conditions. In order to analyze closely the sorption kinetics of these metals, and to determine the relative importance of different rate controlling processes, time dependent particulate and dissolved concentrations were obtained from about 1 min. to 100 days. Very fast sorption for each metal was followed by much slower and extended uptake. Overall metal sorption rates for the faster uptake reactions are proportional to their final distribution coefficient, K d . Times to reach 90% of final fraction sorbed range from <1 min for Sn to about 6 days for Zn. Sorption rate variations for the different metals indicate particle residence time as a master variable in scavenging, and the rate versus K d relationship allows Th to be used as an analogue for other scavenged metals. Linearizing the sorption data to an overall first order reaction model suggests that for our experiments four distinct processes exist with characteristic time periods of <1 min, ~20 min, ~4 hrs and several days. The results suggest that scavenging is affected by both surface chemical properties and biological activity. In general, stronger binding metals sorb rapidly via chemical and physical processes, while metals with weaker particle associations are taken up much more slowly and may be controlled biologically. Two uptake models and the theoretical limits of rate controlling processes such as surface reactions, diffusion and mass transfer are also discussed.

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