Determination Of Dissolved Oxygen of water using Dissolved Oxygen (D.O.) Meter
Apparatus Used: DO Meter with electrodes (DO Probe)
Procedure:
- Switch on the DO Meter.
- Open the electrode cap & pour 7.5% KCL solution in it to electrode as electrolyte.
- Close the cap & check that there is not any bubble in it.
- If membrane is turned out then use new membrane.
- To activate new membrane keep it in hot water for 2 hrs then in cold water for an hr or alternatively.
- Add this membrane & start the experiment.
- Now connect the electrodes to it.
- Check the value of cell constant.
- Calibrate the electrodes with standard solution.
- Such as the amount of D.O. at 23 degree celcius of deionized water is 8.38.
- Calibrate instument using deionized water.
- Now take sample of water & dip the DO probe in it.
- Keep stirring.
- Note the reading when it is nearly stable.
Result:
The stable value recoded is the desired DO value of the water sample.