7 calibration curve technique – Metrohm 757 VA Computrace User Manual
Page 160
7 How to ...?
757 VA Computrace – Software
150
7.7
Calibration curve technique
Record calibration curve manually by adding standard solution
This method is used for preparing different calibration solutions
by adding several times a concentrated standard solution to the
measuring solution using a pipette. Proceed as follows:
1. Click on
or
MAIN WINDOW
/ Mode / Determination
.
2. Click on
or
MAIN WINDOW
/ Window / Working method
specification
to open the
WORKING METHOD SPECIFICATIONS
window.
3. Load the desired method into the
WORKING METHOD SPECIFI-
CATIONS
window (see How to load a method).
4. Select
Record calibration curve
in the
Calibration
field of the
WORKING METHOD SPECIFICATIONS
window.
5. Select
Manual
in the
Addition
field of the
WORKING METHOD
SPECIFICATIONS
window.
6. Select
Batch
in the
Technique
field of the
WORKING METHOD
SPECIFICATIONS
window.
7. Click
to open the
EDIT WORKING METHOD PA-
RAMETERS
window.
8. Select the
Determination
tab (see section 5.2) and enter the
Cell volume
and the number of additions in the
No. of additions
field.
9. Select the
Substances
tab (see section 5.2) and make sure
that for each substance entered in the table the number of the
single or mixed standard solution, its concentration and its
volume is defined.
10. If the addition of the standard solution should be done with
variable addition volumes, click the button in the
Volume
column to open the
EDIT VARIED ADDITION
window, enter the
variable addition volumes in the
Addition
fields, and close this
window by clicking
<OK>
.
11. Close the
EDIT WORKING METHOD PARAMETERS
window by
clicking
<OK>
.
12. Place the electrolyte solution (e.g. buffer) in the measuring
vessel at the 757 VA Computrace Stand.
13. Click on
or
MAIN WINDOW
/ Window / Monitor
to open the
MONITOR
window.
14. Start the measurement by clicking the
icon in the
MAIN
WINDOW
or the
button in the
MONITORING
window.