L1 /
11
CH3041
SOLID STATE
ELECTRODE
2) Solid State
electrodes. F- electrode
• electrolyte 0.1M NaF, 0.1M NaCl
• LaF3 crystalline is a conductor.
• LaF3(s) D
LaF2+(s) + F-(aq)
•The
new potential on the
inside of the crystal is sensed
and displayed.
inside of the crystal is sensed
and displayed.
• Range: [F-] 10-6 - 1 M . IDL 0.02ppm
• Selectivity
coefficient: kOH-,F- = 0.1
(k = response OH- / response F-)
(k = response OH- / response F-)
• Widely used in monitoring fluoride levels
in public water supplies.
in public water supplies.
electrolyte
Inorganic
crystal
LaF3
LaF3
V
Ag/AgCl
