Experiment no. 1
AIM : TO DETERMINE TURBIDITY OF GIVEN WATER SAMPLE.
APPARATUS REQUIRED: 1. Turbidity meter with its accessories.
2. container , beaker
3. water sample, soft cotton cloth
THEORY :
Turbidity in water is due to suspended particles like clay, clay ,silt,finely divided matters and macroscopic organisms.
Turbidity meter is used for measurement of turbidity in Nephelometer turbidity unit i.e.NTU with reference to standard solutions.
Turbidity meter basically involves scattering phenomenon due to suspended particles when light passes through sample. this scattering of light is generally proportional to turbidity.
PROCEDURE:-
1. standardise the turbidity meter. select the turbidity change according to expected value of meter.
2. push the calibration key to enter the calibration(calibration is basically satisfying the standards) mode follow instrument instructions on display.
3.insert the 20 NTU standard solution and close the lid .
4.push read button, the display shows stabilizing and than shows the result.
5. repeat step 2&3 with 100 and 800 NTU
to calibrate standards.
6. save the results and press exit , clean the water sample with cotton cloth.
7.place sample cells in turbidity meter and close the lid , press read and turbidity value is measured as NTU.
CALIBRATION TABLE:
S.no. Standard turbidity
Turbidity obtained
Of sample(NTU) (NTU)
1. 10 9.88
2. 20 20
3. 100 99-101
4. 800 793-802
OBSERVATION TABLE:-
S.NO. Water sample Turbidity
(NTU)
1. SAMPLE1 0.51
2. SAMPLE 2 29.5
3. TAP WATER 0.95
4. POND WATER
PRECAUTIONS:-
1.CALIBERATE the meter and verify the calibration mode.
2.Do not air dry the sample cells.
3.wipe the outside of the sample cells with soft cotton cloth.
4.Reading must be taken carefully.
If turbidity of water sample is less than 5 NTU then it is safe for drinking purpose, if greater than 5 then not safe.
AIM : TO DETERMINE TURBIDITY OF GIVEN WATER SAMPLE.
2. container , beaker
3. water sample, soft cotton cloth
THEORY :
Turbidity in water is due to suspended particles like clay, clay ,silt,finely divided matters and macroscopic organisms.
Turbidity meter is used for measurement of turbidity in Nephelometer turbidity unit i.e.NTU with reference to standard solutions.
Turbidity meter basically involves scattering phenomenon due to suspended particles when light passes through sample. this scattering of light is generally proportional to turbidity.
PROCEDURE:-
1. standardise the turbidity meter. select the turbidity change according to expected value of meter.
2. push the calibration key to enter the calibration(calibration is basically satisfying the standards) mode follow instrument instructions on display.
3.insert the 20 NTU standard solution and close the lid .
4.push read button, the display shows stabilizing and than shows the result.
5. repeat step 2&3 with 100 and 800 NTU
to calibrate standards.
6. save the results and press exit , clean the water sample with cotton cloth.
7.place sample cells in turbidity meter and close the lid , press read and turbidity value is measured as NTU.
CALIBRATION TABLE:
S.no. Standard turbidity
Turbidity obtained
Of sample(NTU) (NTU)
1. 10 9.88
2. 20 20
3. 100 99-101
4. 800 793-802
OBSERVATION TABLE:-
S.NO. Water sample Turbidity
(NTU)
1. SAMPLE1 0.51
2. SAMPLE 2 29.5
3. TAP WATER 0.95
4. POND WATER
PRECAUTIONS:-
1.CALIBERATE the meter and verify the calibration mode.
2.Do not air dry the sample cells.
3.wipe the outside of the sample cells with soft cotton cloth.
4.Reading must be taken carefully.
RESULT:- ....................................
If turbidity of water sample is less than 5 NTU then it is safe for drinking purpose, if greater than 5 then not safe.
