Metrohm 797 VA Computrace - Manual (Page 264)

8 How to ...?
797 VA Computrace – Software
252
Measure a sample using a calibration curve
For the determination of a sample using a previously recorded ca-
libration curve, this calibration curve must have been recorded and
saved. 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, section 8.4).
4. Select Sample with calibration curve in the Calibration field of
the WORKING METHOD SPECIFICATIONS window (Is not select-
able with the CVS and CPVS mode).
5. Click to open the EDIT WORKING METHOD PA-
RAMETERS window.
6. Select the Determination tab (see section 5.2) and enter Sample
identifier , Sample amount , Cell volume and the name and direc-
tory of the determination with the recorded calibration curve in
the
Calibration curve field.
7. Close the EDIT WORKING METHOD PARAMETERS window by
clicking .
8. Place the sample solution in the measuring vessel at the 797
VA Computrace stand.
9. Click on or MAIN WINDOW / Window / Monitor to open
the MONITOR window.
10. Start the measurement by clicking the icon in the MAIN
WINDOW or the button in the MONITORING win-
dow.
11. Enter the Sample ID (used as part of the determination file
name) in the PLACE SAMPLE window and click .
8.9 Work with film electrodes
Deposit a mercury film
You find a suitable method for the determination of heavy metals
with mercury film electrodes in Application Bulletins 241 and 254.
1. Polish the glassy carbon (6.1204.110) or Ultra Trace electrode
tip (6.1204.100) with alumina powder (6.2802.000) and put
the electrode into the 797 VA Computrace stand.
2. Put the electrolyte solution into the measuring vessel, e.g.:
Add 10 mL ultrapure water, 200 μL c(HCl) = 6 mol/L) and 50 μg