Río San Pedro sediment + 30 g NaCl + 1.5 g CaSO4 + Paper
The column was prepared the following way: in a container we put some sediment from the river and we mixed it up with all the ingredients. Then, in a plastic bottle we poured some of the mixture with the aid of a funnel. Finally, we poured sediment without anything else to fill ¾ parts of the bottle and some water from the river as well.
On 9th march, two weeks later, we could see for the first time the evolution of the column. Changes were evident, as well as both bottles were different (one of them has been receiving daylight, column 1, whilst the other one has not, column 2).
On the one hand, regarding the column 1, we can see there is a black product in the bottom of the bottle and also the part of it that has not received light directly. This is due to the breathing of some microorganisms that transform calcium sulphate into iron sulphate. It is observed an orange product in the back of the column too, which is iron oxide. Lastly, just add that we saw a few small bubbles of air on the surface of the sediment which comfirms the existence os microorganisms (probably seeweed).
On the other hand, comparing column 1 to column 2, we can tell remarkable differences. Mainly, the iron sulphate is more spread out to the whole bottle, and there is hardly any iron oxide. As well as in column 1, we have seen bubbles in the surface.
The column was prepared the following way: in a container we put some sediment from the river and we mixed it up with all the ingredients. Then, in a plastic bottle we poured some of the mixture with the aid of a funnel. Finally, we poured sediment without anything else to fill ¾ parts of the bottle and some water from the river as well.
On 9th march, two weeks later, we could see for the first time the evolution of the column. Changes were evident, as well as both bottles were different (one of them has been receiving daylight, column 1, whilst the other one has not, column 2).
On the one hand, regarding the column 1, we can see there is a black product in the bottom of the bottle and also the part of it that has not received light directly. This is due to the breathing of some microorganisms that transform calcium sulphate into iron sulphate. It is observed an orange product in the back of the column too, which is iron oxide. Lastly, just add that we saw a few small bubbles of air on the surface of the sediment which comfirms the existence os microorganisms (probably seeweed).
On the other hand, comparing column 1 to column 2, we can tell remarkable differences. Mainly, the iron sulphate is more spread out to the whole bottle, and there is hardly any iron oxide. As well as in column 1, we have seen bubbles in the surface.
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