Metrohm tiamo 2.3 Patch 1 - Manual (Page 851)

￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭ 5 Method
tiamo 2.3 Patch 1 ￭￭￭￭￭￭￭￭ 835
The diagram shows KF titration curves at different polarization currents. It
is clear to see that the position of the endpoint varies with the polarization
current. The curves have different slopes, i.e. dynamics must also be adap-
ted. Polarization currents smaller than 10 µA are not suitable for this appli-
cation. The following table gives an idea of the optimal control parame-
ters for various polarization currents.
Ipol 10 µA 20 µA 30 µA
EP 50 mV 100 mV 150 mV
Control range 70 mV 100 mV 120 mV
Max. rate
Maximum rate with which iodine is generated outside the Control
range.
Range 1.5 ... 2240.0 µg/min
Default value 1000.0 (slow), maximal (optimal), maximal
(fast) µg/min
Selection maximum
Min. rate
This parameter defines the minimum rate with which iodine is generated
inside the Control range. The smaller the rate the slower the titration
and the higher the accuracy.