Horiba Scientific 6561S-10C, Instruction Manual

Page: 81 / 89

69
Reference
Table 6 Relationship between
temperature of chloride ion selective electrode and theoretical slope
If the temperature of the sample solution in measurement differs from the
temperature of the standard solution in calibration, perform calibration
again.
When the electrode is moved to a place that has a different temperature,
wait until the temperature of the electrode becomes same as the
temperature of that place before using the electrode.

Impact of stirring
The impacts on the measurement of the electromotive force by stirring the
sample solution are, for example, slow response, inability to measure the
low concentration solution, and the change of the electrode potential.
It is best to control the stirring speed so that the stir bar will rotate 3 or 4
turns per second.
If swirling occurs on the surface, the stirring speed is too fast. Reduce the
speed to a level where swirling does not occur.
Temperature
[°C]
Theoretical slope of fluoride ion selective electrode
[mV/decade]
0 -54.20
10 -56.18
20 -58.16
25 -59.16
30 -60.15
40 -62.13
50 -64.11