Computer Science
Scientific paper
Nov 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49.2493c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 49, Issue 11, pp.2493-2497
Computer Science
6
Scientific paper
The concentrations of Ca, Mg, Fe, Mn, Cr, Co, Ni, Cu, Zn, Cd and organic carbon were measured in a sediment porewater sampled by two different techniques: in situ dialysis, and centrifugation followed by filtration. Sediment centrifugation at 5,000 rpm followed by filtration (0.45 m membrane) was equivalent to dialysis for Co, Ni, Cr, Fe, Mn but gave higher and more variable concentrations for Cu, Zn and organic carbon. Concentrations comparable to those obtained by dialysis were found when centrifugation speed was increased to 11,000 rpm and when 0.2 or 0.03 m membranes were used to filter the supernatant. This procedure was also found equivalent to dialysis for Cr, Co, Ni, Cd and organic carbon. A reduction of the dialysis membrane pore size to 0.002 m did not produce any apparent change in the porewater composition; however, a further reduction to 0.001 m indicated either incomplete equilibration after two weeks, or exclusion of medium sized metal-organic complexes. Because of its inherent simplicity, in situ dialysis appears particularly well adapted to the study of trace constituents in sediment porewaters under field conditions.
Carignan Richard
Rapin F.
Tessier Alexandre
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