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1.The self-introduction
We, the three seniors have followed the Environmental Education Course
and studied the water quality of both OMOSE and KAMIYAMA River.
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2.The preface
Today, we present about the water quality investigation on the river in
Kesennuma ,which worked on by the choice class which was done for 12 times
from April.
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We are interested in the natural environment in Kesennuma where we grew up, but we didn't learn specially so far about the environment.
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There was the choice class in 3rd grade of the Kesennuma high school, this time, we had an interest in the natural environment in Kesennuma and took the lecture to learn water quality investigation on the river.
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Today, we are going to present the result which worked on by the choice class which was done for 12 times from April.
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3.The introduction of Kesennuma
First, we are going to introduce Kesennuma easily.
Kesennuma City which located Kesennuma high school is facing a Kesennuma
bay, which on the sawtooth coastline. And Kesennuma City is the area which
the natural environment, the forest, the river and the sea, matches compactly.
Also, Kesennuma City is famous marine city in Japan, and catch of pacific
saurys and tunas. |
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4.The investigation way
Well, we want to present the contents which worked on by the class.
Today, we did water quality investigation about two rivers which flow through Kesennuma City, Omose river and Kamiyama river.
The investigation way is six in all. It is chemical oxygen demand, the nitrogen in a ammonia state, the nitrogen in a nitrous acid state, the nitrogen in a nitric acid state, phosphorus in a phosphoric acid state, and pH.
COD is the value of oxidant which is necessary to oxidize the material in water, for example organic matter by oxidizing agent, for example potassium permanganate. It is used as the index which shows the degree of the organic pollution of the lake marsh and the sea.
The nitrogen compound which is contained in water is divided into the nitrogen into a inorganic state and the nitrogen into a organic state. Besides the nitrogen into a inorganic state is divided into the nitrogen in a ammonia state, the nitrogen in a nitrous acid state and the nitrogen in a nitric acid state. The nitrogen into a organic state is resolved by the nitrogen in a ammonia state with the microorganism and so on. The nitrogen in a ammonia state derives from the urine and home waste water, factory waste water, becomes the influential index of their water quality pollution. The fact that The nitrogen in a ammonia state is detected shows that the degree of the organic pollution is big and to lack dissolved oxygen about whether or not it shows not to be between, too, after a river is polluted. Because the nitrogen in a ammonia state changes into the nitrogen in a nitrous acid state and in a nitric acid state in the natural river.
The nitrogen in a nitric acid state is the last product which occurred with a various nitrogen compound oxidized. It is the one which was made the condition that the purge moved ahead and that it was stable in the range of the purge feature of the nature. Also, the nitrogen in a nitric acid exists much in water shows that the water receives pollution by nitrogen compound in the past or organic nitrogen compound was much supplied to the water.
In the same way nitrogen, the phosphorus compound which is contained in water is divided into the nitrogen into a inorganic state and the nitrogen into a organic state. Besides the phosphorus into a inorganic state is divided into the phosphoric acid and the poly-phosphoric acid. The phosphorus into a organic state and the poly-phosphoric acid are gradually resolved and become the phosphoric acid finally. At usual area of the river, those material by the natural load are very few and most are an artificial load, for example the agricultural chemicals, the manure, the home drainage, factory waste water and so on.
pH is the index which shows the acidity and the alkalinity of water. In the neuter when the value of the pH is 7, smaller, it is an acidity than 7 and mainly, it is alkalinity than 7. Usual fresh water often shows a value near the neuter, the table effluent often rather shows alkalinity and underground water often shows an acidity.
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5.The investigation place
The investigation place chose 2 spots of the upper stream and the lower
reaches from the spot which is the same as last year about Omose river.
In the same way it chose about Kamiyama river, too. Kamiyama river was convenience in the time, and we could not go and having a teacher extract water for us.
This is a photograph near the gathering place of Omose river.
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6.The investigation way
The way of the investigation used a handy pack test.
The pack test is the one which compares the color which appears behind the reaction time of the specification with the standard color, absorbing sample water to the tube which a reagent was enclosed with and judges the concentration of oxydized material and the nitrogen into a ammonia state and so on.
From now, we are going to demonstrate a way of experimenting on the pack test.
This is the pack test of COD.
Because it takes time for a while until the result comes out, first please look at this sample to adjust beforehand.
The color of a sample changes in this way, we judges the value of COD in comparing this with the standard color. |
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7.experiment result
It is the result of the experiment.
It found that Omose river basin was the river which is very pure with both few inorganic phosphorus compounds few inorganic nitrogen compounds there being.
But, the value of COD had gotten for the number compared with the value
to have won in the oxidation deoxidization titration which was done last
year to be big.This seemed to be a pack test precision problem and to use
the higher pack test of the precision and that COD must be measured by
the correct experiment.
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On the other hand, in Kamiyama river basin, the value of COD had become
quite big. The organic one seems to have flowed through the lower reaches
because it was raining the day to have investigated the water quality of
Kamiyama river and COD seems to have become high.
Also, it thinks that there is possibility that phosphorus is flowing from the downstream habitation because there are many inorganic phosphorus compounds in the lower reaches.
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8.The reflextion of the participation student
Lastly, we say a reflextion through the class this time.
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We have any interest in the thing chemical too much so far, but I found what it was investigating, being to investigate, going to the spot actually and the interest boiled up.
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It wasn't conscious so far but I found the fact that the river in Kesennuma is beautiful. I reconfirmed how wonderful kesennuma is.
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