5-12
METHODS
Dynamic dosing allows for larger doses far from the endpoint, reducing the total titration
time. Closer to the end point, smaller doses are made, providing more data and improved
accuracy.
The following parameters must be set:
min Vol:
The smallest dose to be dispensed during a titration.
The
min Vol
must be greater than or equal to:
0.001 mL for a 5 mL burette
0.001 mL for a 10 mL burette
0.005 mL for a 25 mL burette
max Vol:
The largest dose to be dispensed during a titration.
The
max Vol
must be less than or equal to 4.000 mL.
delta E:
Sets the fixed potential jump that has to be achieved after each titrant dose.
The allowed range is between 0.1 and 99.999 mV.
Recommendations for dosing parameters:
For steep and normal titration curves the recommended settings are:
delta E
3.5 to 9 mV
min Vol
0.010 to 0.025 mL (for a 25 mL burette)
max Vol
0.075 to 0.250 mL (for a 25 mL burette)
For flat titration curves the recommended settings are:
delta E
10 to 15 mV
min Vol
0.050 to 0.150 mL (for a 25 mL burette)
max Vol
0.400 to 0.600 mL (for a 25 mL burette)
To achieve the highest levels of accuracy and reproducibility, it is recommended that 20-80%
of the nominal burette volume used for each titration is consumed. If lower volumes of
titrant are required, a smaller burette can be used.
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