7
Fluoride Ion Selective Electrode User Guide
Measurement Units
Fluoride concentration can be measured in moles per liter (M),
parts per million (ppm) or any convenient concentration unit.
Table 1
Concentration Unit Conversion Factors
Moles/Liter (M)
ppm
1.0 19000
10
-1
1900
10
-2
190
10
-3
19
10
-4
1.9
Sample Requirements
The epoxy body of the fl uoride electrode is resistant to damage
by inorganic solutions. The electrode may be used intermittently
in solutions that contain methanol or acetone. Contact Technical
Support for information on using the electrode for specifi c
applications.
Samples and standards should be at the same temperature.
The solution temperature must be less than 100 °C.
In all analytical procedures, TISAB must be added to all samples
and standards before measurements are taken.
