30
Fluoride Ion Selective Electrode User Guide
6. Calculate sample concentration, C
s
x:
C
S
x = [(V
t
x * V
f
o) / (V
f
x V
t
o)] * C
S
o
where
C
S
x = sample concentration
C
S
o = fl uoride standard concentration (0.1 M)
V
t
x = volume of titrant added in unknown sample titration
at endpoint
V
t
o = volume of titrant added in standardization titration
at endpoint
V
f
x = volume of sample used in sample titration (25 mL)
V
f
o =
volume of standard used in standardization titration
(25 mL)
-100
-50
0
50
100
5
10
15
20
25
titrant volume (mL)
electrode
potential
(mV)
Figure 3 Titration of 0.114 M F¯ with 0.1 M La(NO
3
)
3
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