Rio San Pedro’s sediment + 30g NaCl + 1.5g CaSO4 + Piece of paper
6th of April. After 6 weeks since column preparation, we could see them for third time. This time, we didn´t see obvious changes like another ones. It should be pointed out an increase of respiration products of microorganisms, as in the light column with iron oxide (orange) and iron sulphate (black), as in the dark column which prevails only iron sulphate. We can also emphasize an increase of microorganisms on the surface, where are mainly green algae.
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