Evaluation Of Photometric Titrations - Metrohm Spectrosense 6.5501.100 Mode D'emploi

3 Evaluation of photometric
titrations
The forms of photometric titration curves may vary widely. These forms
and subsequently the evaluation of the titrations depend on various
factors:
• the type of the indication: self-indicating titrations or titrations with
• absorption or transmission curves
U/mV
EP
U/mV
U/mV
Spectrosense, Instructions for Use
added indicator
IP
V/ml
IP=EP
V/ml
EP
IP
V/ml

3 Evaluation of photometric titrations

The indicator changes its color after the
endpoint (EP) of the titration has been
reached.
IP: Changing point of the indicator.
Evaluation: Intercept of tangents.
The indicator changes its color in the
region of the endpoint of the titration.
IP: Changing point of the indicator.
This applies for most self-indicating titra-
tions.
Evaluation: Potentiometric inflection point
evaluation.
The indicator changes its color before the
endpoint (EP) of the titration has been
reached.
IP: Changing point of the indicator.
Evaluation: Intercept of tangents.
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