This is our first post about our Winogradsky column and what happened the first month.
Our column was made by sand from river San Pedro's beach, sand from the lake next to the river, starch, iron sulfate (FeSO4), calcium carbonate (CaCO3) and little pieces of filter paper used as carbon.
What we pretend to show is that our sediments are
beneficial for sulfurous and ferrous bacterias to grow, as we can see because
the color will change.
The
first week, we observed that little mollusc were showing their faces, and that
the column has started to being clearer.
In the 3th and the 4th weeks, the column didn't change too much because it was raining and the sky was cloudy, so there was no sun for the bacteries to grow.
Luckily, finishing the 4th week the sun shined again and the column become more red because of the kind of bacteries that metabolise iron.
The lasts weeks, the column has started to change visibly. The weather
these last days had been really sunny and warm, so the column changed because
of the heat and light. Looking at the colors, we can see that it has changed to
a darker red, even the clear red that was perfectly visible the other week, has
turned darker.
The bottom
of the column is getting darker too and it seems like it is happening what we
expected, anaerobian bacteries (dark colour) ferrous bacteries (red line).
Hi G3,
ReplyDeleteI like your warning sign!
So what gives the black and red color? The bacteria?
S.
This is a very "responsive" column. It's going smoothly, I think!
ReplyDelete