Equivalent Point Determination (Ip Methods) - Radiometer Analytical TitraLab 870 Reference Manual

TitraLab ®
Equivalent point
determination
(IP methods)
Page 126
Incremental addition of the titrant (Monotonic/Dynamic IP
methods):
• acquisition of the titration curve E (electrode) = f (volume of titrant
dispensed),
• determination of the first derivative curve using a smoothing proc-
ess (depending on the value set for IP filter),
• determination of the second derivative curve,
• determination of the maxima of the first derivative curve using the
IP filter parameter. These maxima correspond to the zeros of the
second derivative curve.
• determination of the equivalent point: for this point the maximum of
the first derivative curve must be equal to or greater than the preset
IP reject method parameter.
E or pH
Figure 23: Determination of an equivalent point - Monotonic or Dynamic IP
An equivalent point is determined and plotted live on the titration
curve. The method is stopped after a given number of equivalent
points has been detected.
TitraLab 870 Reference Manual
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