Metrohm 757 VA Computrace User 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
<OK>
. 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
<OK>
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
<OK>
button.