Mastora
Katerina - Kritikos Thanos (Team 10).
We are a team
of two people which have already started to practice above the Winogradsky
column. In this column, we used a quantity of sediment and sea water from
Anauros beach which is a region at the southwest of Volos. The ingredients of our experiment were a
quantity of sea water, an egg, pieces of paper, a portion of sea water and at last an amount
of milk.
INGREDIENTS OF MILK
The main
ingredients of milk which have a connection with raise of microorganisms are:
v Proteins, which
characterize for the high biological value
and supersede all other animal proteins except
those of egg.
v Sugars, such as lactose which it is not found nowhere
else in nature in appreciable amounts except
from milk.
v Tallow(fat),which dominates in comparison with the other animal fats because
it is more easily digested and
contains a large proportion of
unsaturated fatty acids.
v Water in a quantity of 85%.
v Salts, such as calcium and phosphorus
in large quantities and magnesium, iodine and iron in smaller quantities.
The first
result of the addendum of the fresh milk was the quickening of the experimental
procedure.
●1st DAY
During the
first day of our experiment, the column was sealed and placed in a bright place with relatively
small temperature changes.
●2nd DAY
During the second day, we noticed an increase in the turbidity
of water. The turbidity
caused to the increase of phytoplankton cells. As shown in the photo below shows a pale green
colour.
2nd DAY
●3rd -4th DAY
During the
third and fourth day of our experiment, the turbidity of water was reduced significantly and on the
water surface has started to form CaCO3.
In this case, with milk and therefore the largest amount Ca, this phenomenon
appears to occur quicker than in naturally conditions. The reduction of
turbidity is caused by the fact that the HCO3 has presented in the water, is no longer consumed by the
cells of phytoplankton and forms CaCO3, in reaction Ca.
3rd & 4rth DAY
●5th – 6th
DAY
In the fifth
day of our experiment we observed the creation of a black
banding around the bottle . On the sixth day,
the extent was increased at a small rate and the colour was
more intense. The black colour is
caused by the presence of FeS (silica-mineral), which is formed anaerobically from the iron
and sulfur reactions, as there is
production of hydrogen sulfide.
5th – 6th DAY
Hi omada 10,
ReplyDeleteSo why did the phytoplankton appear and disappear in one day?
It is interesting that you have a more intense black color near the surface and not deeper down.
Can you explain what is FeS? Mineralogy is not my strong point.
The flowering of phytoplankton, except from the sediment surface is impossible. This happens because of the anaerobic conditions of the sediment and the effect of the sunlight. Also the sufficiency of nutrients plays an important role. The black color causes from the anaerobic reactions between ferrum (Fe) and sulphur(S) and with the production of hydrogen sulfide is created mineral FeS( black color).
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