Diffusivity in surficial sediments and benthic mats determined by use of a combined N 2 O-O 2 microsensor

Details Diffusivity in surficial sediments and benthic mats determined by use of a combined N 2 O-O 2 microsensor Diffusivity in surficial sediments and benthic mats determined by use of a combined N 2 O-O 2 microsensor

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59..231g&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 59, Issue 2, pp.231-237

Mathematics

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Scientific paper

Diffusional characteristics of two biologically active surface sediments were determined by use of a combined N 2 O-O 2 microsensor. By analyzing changes in the N2O-gradients in these sediments, it was possible to determine the product ( D s ) for this species with submillimetre depth resolution, where is the porosity and D s the substrate diffusion coefficient. The ( D s )-value for O 2 could be calculated then from ( D s )-value for N 2 O, because the diffusivity of the two molecules were modified in the same way within the sediment. Both sediments exhibited fine-scale horizontal and vertical variability in diffusion characteristics, and this must be accounted for when analyzing microprofile data. The average ( D s )-value for N 2 O at 20°C for an estuarine surface sediment was 0.93 × 10 -5 cm2 s -1 (at 0-4 mm depth), while the value for the upper 2 mm of a stream sediment covered by a microbial mat was 1.42 × 10 -5 cm 2 s -1 . Biological inactivation and oxidation by exposure to an O 2 atmosphere had no effect on the measured ( D s ) for the estuarine sediment; however, the value for the sediment covered by a microbial mat, with dense populations of meiofauna, decreased by 20%. The method presented is ideal for measurements of diffusivity at a high spatial resolution in surficial sediments and densely packed microbial communities.

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