Redox processes on a grain scale, the possible effect of organic matter in stagnant inter/intra-granular voids

Rasmus Jakobsen & Rasmus Jakobsen
The presence of stagnant zones in porous media is often used to explain the observations of self-contradictory redox chemistry once the possibilities of borehole mixing are ruled out. As an example, methane is found in very small amounts in many suboxic groundwaters, though methanogenesis requires very reduced conditions (high H2 levels) in order to be thermodynamically feasible. This feature has been produced in a previous model using a simple dual-porosity 1-D PHREEQC model (Jakobsen, 2002),...
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