we are not an environmentalist. we are an Earth warrior

Saturday, 25 June 2011

Biochemical Oxygen Demand Experiment

Date : Tuesday, 21st June 2011
Time : 3.00 p.m - 4.30 p.m
Venue : Biology laboratory

Objectives :
  • To analyse data on water pollution
  • Expose the students about water pollution in the certain type of water.
  • Encourage the students about the important of clean water for our life.

On this day, some of our friends was doing an experiment about biochemical oxgen demand (BOD). They started the experiment from 3.00 p.m until 4.30 p.m. Our school's teacher, Puan Azizah bt. Muda helped them during experiment.

Technique :

  • Record the time taken for methylene blue solution to decolourise by using a stopwatch

Our teacher Puan Azizah Muda observe their experiment 

Apparatus and Materials needed in this experiment 

All young scientist start to do the experiment


Ranareem observe any change in water samples



Puan Azizah watching all scientist do their work

Rahmat is measuring the water



Hud is observing any change in sample water

Observe and record the time taken for methyne blue solution to decolourise


 All the samples water are observe and  record the time taken to decolourise



Discussion :
  • Rapid decolourisation of the methylene blue show that the water has very little oxygen . Hence the B.OD. value of the water sample is high
  • Slow decolourisation of the methynele blue shows that the B.O.D value is low and the water is the least polluted


WHY THIS EXPERIMENT IS VERY IMPORTANT TO US ???


For your information readers.. this is not just an  experiments that you can say its a part of our PEKA. .. This experiments its about our life.. our next generation life.. as you know our earth cover about 70% of water..Many of us seems did not care about the important of clean water in our country..  they expect  there has anyone can care about the water cleanliness... wake up Malaysians.. let us together  keep the water clean... and not just rely on the other people to do that for you.. 



Never does nature say one thing and wisdom another.

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