Metrohm 757 VA Computrace - Manual (Page 152)

7 How to ...?
757 VA Computrace – Software
142
5. Place the analysis solution in the measuring vessel at the 757
VA Computrace Stand.
6. Click on or MAIN WINDOW / Window / Monitor to open the
MONITOR
window.
7. Start the measurement by clicking the icon in the MAIN
WINDOW or the button in the MONITORING window.
8. Follow the instructions in the appearing message windows.
Perform a test determination with the Pb test method
With the aid of this example method for the determination of lead
in the ion standard solution supplied using the DME, you can eas-
ily check whether the 757 VA Computrace System is functioning
properly.
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. Click on or MAIN WINDOW / File / Load method .
4. Select the method file Test Pb in standard solution.mth in the
OPEN
window and click . The method is loaded into the
WORKING METHOD SPECIFICATIONS window.
5. Add 20 mL ultrapure water to the empty measuring vessel at
the 757 VA Computrace Stand.
6. Add 0.5 mL potassium chloride c(KCl) = 3 mol/L (Metrohm
No. 6.2308.020) to the measuring vessel.
7. Click on or MAIN WINDOW / Window / Monitor to open the
MONITOR window.
8. Start the measurement by clicking the icon in the
MAIN
WINDOW or the button in the MONITORING window.
The PLACE SAMPLE window appears.
9. Use a pipette to add 100 µL Pb ion standard solution ρ (Pb) =
1 g/L (Metrohm No. 6.2301.100) into the measuring vessel
and click the
button.
10. The sample solution is measured three times. Then the MAN-
UAL ADDITION window appears.
11. 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
button.