Metrohm tiamo 2.1 (ProcessLab) - Manual (Page 870)

5.6 Commands ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
854 ￭￭￭￭￭￭￭￭ tiamo 2.1 (ProcessLab)
[New]
Opens the dialog window External measured value # in which the
parameters for the external measured value can be entered.
[Properties]
Opens the dialog window External measured value # in which the
parameters for the external measured value can be edited (see Chapter
5.6.3.10.2, page 859).
[Delete]
Deletes the external measured value selected in the table.
5.6.3.8.7.10 STAT U - Fix endpoint evaluation
Dialog window: Method ▶ STAT U ▶ Properties... ▶ Additional evaluations ▶ Fix
endpoint evaluation ▶ [New]/[Properties] ▶ Fix endpoint evaluation #
Quantity
Selection of the fixed measured quantity to which the associated values for
the other quantities are to be interpolated from the list of measured points.
Selection Measured value | Time | Volume
Default value Measured value
Fix value
Value of the fix endpoint.
Measured value
Range
-2000.0 ... 2000.0 mV
Time
Range
0.0 ... 999999.9 s
Volume
Range
0.00000 ... 9999.99 mL
5.6.3.9 Evaluation
5.6.3.9.1 pK value and Half neutralization potential
Parameters: Method ▶ DET/MET ▶ Properties... ▶ Additional evaluations ▶ pK/HNP
evaluation
The pK value can be determined for pH titrations (DET and MET) and the
half neutralization potential can be determined for U titrations.
The activities of conjugated acid-base pairs are linked by the following equa-
tion (Henderson-Hasselbalch equation):
pH = pK
a
+ log (a
B
/a
A
)