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

Abstract

By using the authors' proposed relation, the whole-sediment diffusion coefficients can be calculated from D[sub 0] and [phi] using a constant (n) over a wide porosity range (0.4-0.9), with a better fit than is possible by using Archie's relation with a constant exponent. In the porosity range of 0.7-0.9, there is no significant difference between the calculated diffusion coefficients using either relation. This also would be expected because the difference between their approximation of ([theta][sup 2]) and the previous approximations of ([theta][sup 2]) are minor. The general usefulness of their relation still needs to be tested with results from other diffusing species. One example is shown where whole-sediment diffusion coefficients of tritiated water measured in lake sediments (Sweerts et al., 1991) are fitted using Archie's relation and the authors' relation. Also, for this species, their relation seems to give a slightly better estimate of the whole-sediment diffusion coefficients at the lower porosities, while there is no difference between the estimated diffusion coefficients at porosities above 0.7. To use their relationship, a value of n = 3 seems to be the best choice for clay-silt sediments and, based on only a few results (four porosity values), n = 2 seems tomore » be the best choice for sandy sediments. 29 refs., 8 figs., 1 tab.« less

Authors:
 [1];  [2]
  1. Univ. of Aalborg (Denmark)
  2. Univ. of Aarhus (Denmark)
Publication Date:
OSTI Identifier:
6708544
Resource Type:
Journal Article
Journal Name:
Geochimica et Cosmochimica Acta; (United States)
Additional Journal Information:
Journal Volume: 57:3; Journal ID: ISSN 0016-7037
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; METHANE; DIFFUSION; ECOLOGICAL CONCENTRATION; SEDIMENTS; ENVIRONMENTAL TRANSPORT; POROSITY; SULFATES; CORRELATIONS; SEAWATER; TRACER TECHNIQUES; ALKANES; HYDROCARBONS; HYDROGEN COMPOUNDS; ISOTOPE APPLICATIONS; MASS TRANSFER; ORGANIC COMPOUNDS; OXYGEN COMPOUNDS; SULFUR COMPOUNDS; WATER; 540311* - Environment, Aquatic- Basic Studies- Radiometric Techniques- (1990-)

Citation Formats

Iversen, N, and Joergensen, B B. Diffusion coefficients of sulfate and methane in marine sediments: Influence of porosity. United States: N. p., 1993. Web. doi:10.1016/0016-7037(93)90368-7.
Iversen, N, & Joergensen, B B. Diffusion coefficients of sulfate and methane in marine sediments: Influence of porosity. United States. https://doi.org/10.1016/0016-7037(93)90368-7
Iversen, N, and Joergensen, B B. 1993. "Diffusion coefficients of sulfate and methane in marine sediments: Influence of porosity". United States. https://doi.org/10.1016/0016-7037(93)90368-7.
@article{osti_6708544,
title = {Diffusion coefficients of sulfate and methane in marine sediments: Influence of porosity},
author = {Iversen, N and Joergensen, B B},
abstractNote = {By using the authors' proposed relation, the whole-sediment diffusion coefficients can be calculated from D[sub 0] and [phi] using a constant (n) over a wide porosity range (0.4-0.9), with a better fit than is possible by using Archie's relation with a constant exponent. In the porosity range of 0.7-0.9, there is no significant difference between the calculated diffusion coefficients using either relation. This also would be expected because the difference between their approximation of ([theta][sup 2]) and the previous approximations of ([theta][sup 2]) are minor. The general usefulness of their relation still needs to be tested with results from other diffusing species. One example is shown where whole-sediment diffusion coefficients of tritiated water measured in lake sediments (Sweerts et al., 1991) are fitted using Archie's relation and the authors' relation. Also, for this species, their relation seems to give a slightly better estimate of the whole-sediment diffusion coefficients at the lower porosities, while there is no difference between the estimated diffusion coefficients at porosities above 0.7. To use their relationship, a value of n = 3 seems to be the best choice for clay-silt sediments and, based on only a few results (four porosity values), n = 2 seems to be the best choice for sandy sediments. 29 refs., 8 figs., 1 tab.},
doi = {10.1016/0016-7037(93)90368-7},
url = {https://www.osti.gov/biblio/6708544}, journal = {Geochimica et Cosmochimica Acta; (United States)},
issn = {0016-7037},
number = ,
volume = 57:3,
place = {United States},
year = {Mon Feb 01 00:00:00 EST 1993},
month = {Mon Feb 01 00:00:00 EST 1993}
}