Hach PLATINUM Series Manual page 23

pH, Water and Wastewater,
continued
OR
16.
Store or record the
pH and temperature
readings when they
stabilize.
Sampling and Storage
Collect samples in clean plastic or glass bottles. Fill completely
and cap tightly. Analyze samples immediately, preferably in
the field.
Accuracy Check
Checking Electrode Response
An electrode is responding properly if its calibration slope is
-58 ±3 mV per pH unit.
Checking Calibration Accuracy
Returning the electrode to a calibration buffer and determining
the pH provides a good test of the system. Rinse and
recondition the electrode before measuring subsequent
samples.
Checking the Precision of the Sample Reading
When practical, measure the pH of the sample several times and
ion
report the average pH. sens 2 meters will store and calculate
the average of up to 99 readings.
23