Metrohm 794 Basic Titrino - Manual (Page 29)

2.6 Selection of the mode, key <MODE>
794 Basic Titrino
25
Overview of the titration modes
DET
Dynamic Equivalence
point Titration
MET
Monotonic Equivalence
point Titration
SET, KFT
Endpoint Titration
Titration
Reagent feeding:
Variable volume increments,
depending on the slope of
the curve.
Acquisition of measured
values:
Drift controlled ("equilibrium
titration")
and/or
after a fixed equilibration
time.
Reagent feeding:
Constant volume incre-
ments, independent of the
slope of the curve.
Acquisition of measured
values:
Drift controlled ("equilibrium
titration")
and/or
after a fixed equilibration
time.
Titration to preset end-point.
Acquisition of measured
values:
Continuously
Evaluation
The evaluation of EP' s is
based on the zero crossing
of the second derivative with
a Metrohm correction for the
distortion of the curve from
superimposed jumps. Can
be combined with selectable
recognition criteria.
Recognition criteria:
as for MET
The evaluation of EP's is
based on the Fortuin inter-
polation.
Recognition criteria:
all EP's
only the last EP
only the greatest EP
EP windows
Volume that has been dis-
pensed up to the endpoint
(EPX in mL).
Applications
Suitable titration mode for
most problems. Specially
recommended if jumps lie
very close together and for
very flat jumps.
Note: The reagent feeding
algorithm is based on meas-
ured data. The curve should
therefore not deviate
markedly from S-shape.
For
•
slow titration reactions
(diazotations, coupling
reactions)
• sluggish electrode
response.
• For rapid, quantitative
determinations in ana-
lytical chemistry. Re-
quirement: EP of the ti-
tration reaction is
known and does not
change during a de-
termination series.
• If an excess of titrant
must be avoided.
V/mL
U/mV
V/mL
U/mV
V/mL
U/mV
Control
range
EP