26
Fluoride Ion Selective Electrode User Guide
6. Use
Table 4
to fi nd the Q value that corresponds to the
change in potential, ΔE. To determine the original sample
concentration, multiply Q by the concentration of the added
standard:
C
sample
= Q * C
standard
where
C
standard
= standard concentration
C
sample
= sample concentration
Q = value from
Table 4
The table of Q values is calculated for a 10% volume change.
The equation for the calculation of Q for different slopes and
volume changes is given below.
Q = (p * r) / {[(1 + p) * 10
ΔE/S
]-1}
where
Q = value from
Table 4
ΔE = E
2
- E
1
S = slope of the electrode
p = volume of standard / volume of sample and ISA
r = volume of sample and ISA / volume of sample
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