Water pollution in Elefsina
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Transcript of Water pollution in Elefsina
Water pollution in Elefsina
Sofia KoukouraNatalia Bolou
Philip Siaplaouras
Purposes & Goals
To determine the quality of the Elefsina's sea water
Identify the sources of pollutionCompare industrial & residental
pollutionTo conclude to some results regarding
the data collected
HypothesisAt the beginning we thought that the sea near to an industrial area (Elefsina) would be much more polluted than the sea in the residential area. More specifically about Aspropirgos, we thought that we would find there certain elements that could prove the existence of pollution and eutrofication.
Eutrofication: is caused by the continuous enrichment of the water with nutrients. The presence of these essential nutrients causes the exponential increase of plants and the distraction of the ecological balance
Sources of pollution in Elefsina
Landfill of Ano
Liosia
Sea transports
Industrial units
Design of our research
The pupils are divided in 4 teams, 2 for the industrial areas and 2 for non-industrial.
All teams travelled to get water samples from two distinct parts of Elefsina bay (Aspropyrgos for industrial areas and
Loutropyrgos for non-industrial)
We began with filtering the samples in preweighted
filters2L from Aspropyrgos' sample2L from Loutropyrgos sample
The filters which kept the air particles were left for one week in a drier with the
aim of keeping away the water. By removing the mass of the filters we would
find the mass ofthe air particles.
Air Particles
Suspended particles (Results)
9,0Loutropyrgos
9,5Aspropyrgos
Air Particles (mg/L)Sample
NO2-
In order to determine the quantity of the
NO2- we followed the forthcoming
procedure:
40ml of filtered sample + 5ml of solution
A (we waited for 5min) + 5ml of solution
B (we waited for 10min) and we
measured the absorption of singly
frequenced light from the final (coloured)
product.
In order to get some useful results from the
measured absorbation ratios we had to give
the computer some absorbation values from
solutions with known concentrations. After
“feeding” the machine with these values we
could easily compute the concentration using
simple mathematical functions.
0,28630,3
0,15720,2
0,09220,1
AbsorptionConcentration in NO2
-
A= 0,4726 c + 0,0525
Measurement 2: 0,0541
0,0556Measurement 1: 0,0571
Loutropyrgos
Measurement 2: 0,0526
0,0536Measurement 1: 0,0546
Aspropyrgos
Average absorption
AbsorptionSample
Results (NO2-)
0,0065Loutropyrgos
0,0023Aspropyrgos
C (μgions/L)Sample
Chlorophyll
We had strained in two filters• 2L from Aspropyrgos sample• 2L from Loutropyrgos sample.These filters were put into centrifugal pipes and
were contemplated with acetone. The centrifugal procedure followed and after that the measurement of the absorption of the light.
Firstly, the absorption measurements were carried out in the plain samples and then we measured again after adding 8 drops of solution HCl.
By using a mathematical equation we were able to find the concentration of chlorophyll in the samples.
Aspropyrgos sample
0,84800,7605750nm
0,97300,8460665nm
Absorption
Aa “sample’s + HCl”
Absorption
A0 “sample’s”
Wave length
Loutropyrgos sample
0,46630,4988750nm
0,48770,5402665nm
Absorption
Aa “sample’s + HCl”
Absorption
A0 “sample’s”
Wave length
Chlorophyll results
0,4272Loutropyrgos
0,8437Aspropyrgos
Concentration (μg/L)Sample
C chlorophyll-a = 26,7 ·| E6650 – E665
a |·8
V·5
CONCLUSION
• Aspropyrgos' waters, despite being in an industrial area, has a lower concentration in NO2
-
• Aspropyrgos' waters have slightly more air particles. This small difference is not analogous to the tremendously different environment. Thus, the concentration of air particles cannot be used as an evidence of pollution
• Although Aspropyrgos' waters have a larger concentration in Chlorophyl, this is not due to eutrofication, as originally thought.
ProposalsProhibition of factory wasteControl over the use of chemical
fertilizersControl over the naval waste thrown
into the gulf