DATA LOGGER-BIOCHEMICAL OXYGEN DEMAND(B.0.D)

1. NAME MATRIC NUM.
NOR HIDAYAH BT ISMAIL D20152071972
NOR AZWAHANIN BT ABU HASSAN D20152071976
AZIDA BT MD. ZAIN D20152071993
SBI3013 - Information And Communication Technology
In Biology
DATA LOGGER:
BIOCHEMICAL OXYGEN
DEMAND (B.O.D)

3. *
The biochemical oxygen demand is defined as the measure of
dissolve oxygen require to decompose the organic matter in
water biologically.
BOD
• Pure water has
<1ppm
• Polluted water
>5ppm
<1ppm
>5ppm

4. *
Higher BOD, means that there is dissolved
oxygen in the water, as aerobic bacteria uses
up nearly all of it for respiration.
Hence less dissolved oxygen available
for the fish to used for respiration.
So fish will died.
Continue….

5. *
Engage
River A River B

6. Objective
• Our group make visited
river around TG. Malim
to complete our task in
doing exp. To study the
sample of river of water.
Observation
• We found
that one of
the river
polluted
and more
fish died.
Comparison
• The other
river has
clean and
have many
fish.
Result
• So we took
both of the
water for our
sample of the
river and
study of the
content of the
river
Discussion
• In your
opinion
why fish
died?

7. From your observation, what is
deference between river A and
river B ?
Which water has low
content of the oxygen ?
Why ?

8. *
Sample of water Oxygen dissolve
meter

9. *
1. 4 beaker were labelling with A, B, C and D.
2. 100 mL of pond water are collected and pour into
beaker A.
3. The dissolve oxygen probe was placed in the beaker
A to read the initial dissolve oxygen concentration
directly.
4. The result were recorded in Data Logger spreadsheet
Program.

10. 5. Step 1 to 4 were repeated by using different sample of water
which are drain water, aquarium water and distilled water which
the sample of water is poured into beaker B, C and D.
6. The sample were let until 5 days and D.O probes was placed
again in these samples to read the final D.O concentration.
7. BOD value was determined by the following formula :
B . O . D value = Final D. O – Initial D. O
p
Note : before put the sensor into the next sample of water, rinse
the sensor with distilled water.

11. *