pH is  the  measurement of the acidity or the alkalinity in the solution. If you want to take pH measurement, you must have a pH-meter and you must keep the sensor in a bottle of a KCl saturated solution to protect it.
Before using it, you must clean the sensor with deionized water before drying it.
You must put the sensor in a solution of pH=4, then in a solution of pH=7 to calibrate the pH-meter and having the right settings.
Finally, you have to put the sensor in the stagnant water and wait for the reading to stabilized to have your data.

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