Diffusion coefficients of sulfate and methane in marine sediments: Influence of porosity

Details Diffusion coefficients of sulfate and methane in marine sediments: Influence of porosity Diffusion coefficients of sulfate and methane in marine sediments: Influence of porosity

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57..571i&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 57, Issue 3, pp.571-578

Physics

30

Scientific paper

Tracer diffusion coefficients of sulfate and methane were determined in seawater ( D o ) and in sediments ( D s ). The diffusion coefficients in seawater (20 S) at 4°C were 0.56 ± 0.04 * 10 -5 cm 2 s -1 for sulfate and 0.87 ±0.10 * 10 -5 cm 2 s -1 for methane. The sediment diffusion coefficients can be related to the diffusion coefficient in free solution by , where is the tortuosity of the sediment. The sediment tortuosity calculated from this equation showed a linear relationship with sediment porosity ( ) over the porosity range of 0.4-0.9. From our data, it was possible to deduce the empirical equation 2 = 1 + n (1 - ), which was used to calculate D s from , using n = 3 for claysilt sediments and n = 2 for sandy sediments.

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