Hi everyone! We have observed both colums after other two weeks.
If you look
up and down the bottle to which it has affected him the light, we can see that
the water bottle is murkier due to the presence of cyanobacteria. Also at the
top we are more amount of O2
If we go
down in the bottle, we can distinguish three colors. These colors are green,
yellow, orange and bright red. The color green is found near water and is due
to the presence of cyanobacteria, which are producing O2
In the area
of yellow color, we find sulfur oxidizing bacteria, which use carbon as a source
of organic matter. Find oxygen (bubbles) and hydrogen sulfide. Orange areas is
due to the presence of red non-sulfur bacteria, in the presence of organic
carbon source gives it color. The shades of light red color is due to the
presence of red sulfur bacteria. In this area we find O2 as they use as
reducing the H2S and generate sulfates.
The last
area is black. In this area reducing bacteria sulfate. Using the sulfate
product gives as H2S which react with the Fe (II) to produce iron sulfide,
which is precipitated and this color giving the last zone.
Comparing
the column to light with the column to the dark can see that the water is too
murky. We observed a thin layer of orange due to oxidation of iron. The color
of the bottle is gray due to organic matter. Near the bottom of the bottle we
look dark colors. By not meet the light, we will not see big changes in the
bottle. Here hardly we find microorganisms.
The bottle on the
left is the one about which the light has influenced. However, the bottle on
the right is the one about which the darkness has influenced
The odor of our experiment its worse than the last time due to the presence of hydrogen sulfide (H2S).The lower layer of the sediment its much more darker due to the presence of organic matter.The colour of the water its white-yellow and its different than the last time.
Here we can see that the colour of the water its grey and its different than the last time (DAY 65).Also,the water level its lower than the last time.
We can observe that the colour of the water on the surface layer is white-grey and that means that the microorganismos are dying.
