Mathematics – Logic
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.3365m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 56, Issue 9, pp.3365-3374
Mathematics
Logic
5
Scientific paper
Kinetic experiments were conducted using batch systems to investigate the removal of dissolved Al and 234 Th tracer by dead Phaeodactylum tricomutrnm diatoms in seawater. Experiments were conducted at constant temperature (2°C), pH (7.8), and salinity (30 psu), using realistic oceanic concentrations of dissolved Al (50 nM), and 1, 2.5, 5, and 10 mg/L suspensions of dead diatoms in ultrafiltered (<10,000 NMW) seawater. Results are characterized by a rapid initial removal followed by slower sorption of dissolved Al and 234 Th by the diatoms on time scales ranging from hours to days. Both the removal rate and the percentage of Al and 234 Th removed are strong functions of the particle concentration ( C p ). Modelling the kinetic data as a reversible exchange of metal between solution and particles indicates a first-order dependence of the forward rate constants for Al and 234 Th on C p . Extending these results to oceanic scavenging, it is shown that a first-order dependence exists between oceanic scavenging rate constants for Al and Th and suspended particle concentration for C p ~ 0.01-1 mg/L. This relationship is suggested to reflect the importance of physicochemical removal mechanisms (surface-adsorption, co agulation/sedimentation) rather than active biological uptake of dissolved Al and Th in oceanic waters. Oceanic scavenging rate constants for Al and Th qualitatively agree with removal rate constants predicted by the Brownian-pumping model for reactive metal scavenging.
Moore Matthew R.
Moran Bradley S.
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