36
TIT
rA
TION
Pr
OCEDU
rE
15. TITRATION PROCEDURE
For best accuracy, before taking any measurement, ensure that the pump is calibrated on the selected
range following the description in the PUMP CALIBRATION PROCEDURE section.
Note:
Verify that the instrument has been calibrated (pH and pump) before performing any
titrations. An electrode calibration in 8.30 pH buffer is recommended.
• Refer to instructions described in SETUP MENU section to set up instrument for your measurement.
• Select the corresponding measurement range.
Note:
Before performing a titration in high range dispense roughly 1 mL of titrant in a waste
beaker. This will remove any air bubbles in the tubing. Press Prime then Stop once the volume
has been delivered.
Low Range
(50 mL sample)
High Range
(50 mL sample)
30.0 to 400.0 mg/L as CaCO
3
300 to 4000 mg/L as CaCO
3
0.6 to 8.0 meq/L as CaCO
3
6.0 to 80.0 meq/L as CaCO
3
Sample preparation:
Use a clean pipette to add precisely measured amount of sample to a clean
beaker as indicated below:
Low Range (50 ml) - 30.0 - 400.0 mg/L as CaCO
3
High Range (50 ml) - 300 - 4000 mg/L as CaCO
3
Note:
Failure to use a clean pipette will result in erroneous readings.
• Put the 50 mL sample in the 100 mL beaker.
• Press
Titrator
.
Note:
Do not place the tip into the sample beaker. Place the tip over a waste beaker. A small
amount of titrant is dispensed when the pump resets.
• Press
Start
to begin a titration.
• Place the stir bar in the beaker and put the beaker in the mini titrator top.
50 mL
25 mL
15 mL