Physics
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.2519m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 53, Issue 10, pp.2519-2527
Physics
8
Scientific paper
Cross-flow filtration has been used to study the size distribution of aluminum and organic carbon in an operationally defined colloidal size range (10,000 MW-0.45 m; ~1-10 nm-0.45 m) in coastal and open ocean waters off Nova Scotia. Colloidal aluminum was consistently <5% of the "dissolved" (0.45 m filtered) fraction by direct measure and 15% of "dissolved" Al by difference (0.45 m filtered minus 1-10 nm filtered). Concentrations of Al measured in the colloidal fraction were high in the surface waters of the shelf, 0.44-0.55 nM (3-4% of "dissolved"), and decreased to levels of 0.09-0.15 nM (~ 1% of "dissolved") in deeper waters. The open ocean vertical distribution of colloidal Al was similar to that on the shelf, with elevated concentrations in surface waters, 0.16-0.19 nM (~ 1% of "dissolved"), decreasing to 0.01-0.08 nM (<0.5% of "dissolved") in deep waters. Colloidal organic carbon was ~ <10-15% of "dissolved" organic carbon; however, we recognize that our organic carbon measurements may be underestimated by our analytical method which employs UV-photooxidation. Laboratory experiments, using 234 Th tracer and several surface water samples, showed an increasing percentage of colloidal thorium from open ocean to nearshore waters; 234 Th tracer was always slightly greater than Al in the colloidal size fraction. The relationship between the apparent distribution coefficient ( K ' d ) for metals and particle concentration ( C p ) for oceanic waters has been examined. Model predictions show that, for most of the global ocean, K ' d will be independent of C p . This result is in agreement with oceanic and laboratory K ' d values determined for aluminum.
Moore Robert M.
Moran Bradley S.
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