Metrohm 757 VA Computrace - Manual (Page 153)

7.5 Determinations
757 VA Computrace – Software
143
12. The sample solution spiked with standard addition solution is
measured three times. Then the MANUAL ADDITION window
appears.
13. Use a pipette to add 100 µLl Pb ion standard solution ρ (Pb) =
1 g/Ll (Metrohm No. 6.2301.100) into the measuring vessel
and click the
<OK> button.
14. The sample solution spiked again with standard addition solu-
tion is measured three times. Then the END OF DETERMINA-
TION window appears.
15. Click the <OK> button. The determination is saved automati-
cally if specified on the General tab of the GENERAL SETTINGS
window and the result report is printed if specified on the
Documentation tab of the EDIT WORKING METHOD
PARAMETERS
window.
Perform determinations using the 813 Compact Autosampler
1. Install the 813 Compact Autosampler (see section 1.3).
2. Click on
MAIN WINDOW / Settings / General settings and select
the Automation tab.
3. Check the Use Autosampler option, modify the parameters for
automation as desired and close the GENERAL SETTINGS
window.
4. Close the VA Computrace program and restart the program.
5. If desired, test the automation parameters: Click on
MAIN
WINDOW / Settings / General settings and select the Automation
tab. Fill two sample vessels with water and place them on the
sample rack. Click on
, check the automation pa-
rameters and modifiy them if need be.
6. Click on or MAIN WINDOW / Mode / Determination .
7. Click on or MAIN WINDOW / Window / Working method spe-
cification
to open the
WORKING METHOD SPECIFICATIONS
win-
dow.
8. Load the desired method into the WORKING METHOD
SPECIFICATIONS window (see How to load a method).
9. If desired, modify the loaded method (see How to edit the
working method).
10. Click on or MAIN WINDOW / Window / Sample table to open
the SAMPLE TABLE window.
11. Load the desired sample table or edit the current sample
table (see Sample table, section 5.6).