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Macro 900 Operation Manual
16.8. PT 1545 Fluoride Electrode
Fluoride (F) can be measured by the MAP 2000/2100 using the optional PT
1545 Fluoride electrode within a pH range of 4 – 8.
The Fluoride ISE electrode will suffer interference from hydroxide (OH-) ions,
which are similar in nature.
16.8.1.
Fluoride Calibration Solution Preparation
When a Fluoride ISE electrode is first installed, it must be calibrated at three
points. In order to achieve this, three batches of Fluoride calibration solution
must be prepared.
The solutions required are two 200mL batches of Fluoride at a concentration of
0.5ppm and one 250mL batch of Fluoride at a concentration of 5ppm.
The three calibration solutions should be freshly prepared by serial dilution from
1000ppm
calibration
recommended:
Be sure to handle chemicals with care and to read and comply with all
health and safety advice.
Preparing the 5ppm solution
250mL of 5ppm solution is required.
To prepare this, first make an intermediate dilution of 50ppm. To do this, mix
6mL of 1000ppm calibration standard with 114mL of deionised water. This will
produce 120mL of 50ppm solution.
Next mix 25mL of the 50ppm solution with 225mL of deionised water. This will
produce 250mL of 5ppm solution.
Dispense 200mL of the 5ppm solution into a calibration bottle and retain the
rest for preparation of the 0.5ppm solution.
Preparing the 0.5ppm solution
A total of 400mL of 0.5ppm solution is required. To prepare this, mix 40mL of
the 5ppm solution you have just prepared with 360mL of deionised water.
Dispense the 0.5ppm solution into two calibration bottles (200mL each).
Achieving the correct temperature
During three point calibration, the 5ppm solution and one batch of the 0.5ppm
solution must be at exactly the same temperature. The second batch of 0.5ppm
solution must be at least 10ºC cooler.
© 2013 Palintest Ltd.
standard.
Part number: SS-709-1610
Description: 500mL Fluoride 1000ppm ISE
Supplier: T E Laboratories Ltd, Ireland.
Contact: http://www.tellab.ie
www.palintest.com
The
following
Fluoride
standard
Page 114 of 147
V3
is
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