Rio San Pedro sediment.
After two weeks in darkness some black spots have appeared in the whole column, specially at the bottom of it, while on the top a orange layer has arisen. Water level has risen because the soil has settled more than the last day we checked it.
The black spots are FeS, formed by the reacction of H2S (product of the anaerobic respiration of microorganisms) with the iron in the sediment.
The orange layer correspond to FeO, result of the reaction of the iron form the sediment with the oxigen in air.
This arrangement of the different components is due to the fact that as we go deeper in the column, the quantity of oxigen decreases and the sulfur one increases.
Is it developping as you expected? What you say seems reasonable. What would you expect to see next week?
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