30.7 Coulometric Karl Fischer titration
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292
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917 Coulometer
Problem Cause Remedy
The diaphragm of the gen-
erator electrode is contam-
inated.
ï¿ Clean the diaphragm (in accordance with
directions in the leaflet for the generator
electrode).
A side reaction is taking
place.
ï¿ Consider using a KF oven.
ï¿ See technical literature.
The molecular sieve on the
KF oven has reached its
capacity limit.
ï¿ Replace the molecular sieve.
The gas flow from the KF
oven into the titration cell
is too high.
ï¿ Reduce the gas flow (if you are working
with the oven method with sample vials,
set the gas flow between 40 and 60
mL/min).
The drift becomes
greater after each
titration.
The sample releases water
very slowly.
ï¿ Consider using a KF oven.
ï¿ See technical literature.
The drift is fluctuat-
ing.
The sample solution is
poorly stirred.
ï¿ Set the stirring rate in such a way that the
sample solution will become very well
mixed.
The Control parameters
are set incorrectly.
ï¿ Reset the Control parameters to default
values.
The titration time is
too long.
The drift during condition-
ing is not stable.
ï¿ Wait before starting the titration until the
drift has become stable.
The parameter Start drift
is set too high.
ï¿ Set the Start drift lower.
ï¿ Adjust the Stop drift or use the Relative
stop drift.
The parameter Stop drift
is set too low.
ï¿ Set the Stop drift higher or use the Rela-
tive stop drift.
The water quantity is too
high.
ï¿ Observe the sample size and water con-
tents in accordance with .
The Control parameters
are set incorrectly.
ï¿ Set the parameter Dynamics lower and
the parameter Max. rate higher.
The result is too
high.
The titration cell is not yet
correctly conditioned.
ï¿ Shake the titration cell and wait until the
drift is stable.
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