Metrohm 746 VA Trace Analyzer User Manual
Page 144
4.5 Basic method for DP polarography
746 VA Trace Analyzer / 747 VA Stand
4-59
•
If you do not want an automatic printout in the following determination,
you can either delete this line with the softkey
or clear
the output destination
Printer
for the line with the
•
Press the softkey
. The subpage of "DOCUMENTATION"
appears with the method comment describing, among other things, the
procedure used in the determination.
•
Finally press the
TATION".
4.5.4
Performing the determination
To perform the determination, the following steps are necessary:
1
Switch to dialog page "MONITORING"
•
Press the yellow
whose header shows the loaded method
POL
appears.
2
Switch the program run mode to
determination
If the parameter
Run mode
is set to
calibration
, proceed as follows:
•
Use the cursor keys to select the field
Run mode
.
•
Press the space bar to enter the edit mode.
•
Press the softkey
and confirm this entry with the
key.
3
Entry of the sample volume
Enter the sample volume as follows:
•
Use the cursor keys to select the first field below the title
Sample
size/S0
.
•
Press the space bar to enter the edit mode.
•
Enter
10 mL
and confirm this entry with the
4
Start the determination
•
Press the red
•
The status display in the header of the dialog page "MONITORING"
switches to
* BUSY *
, the start time of the measurement is entered un-
der
Determination
and the determination is given a standard name,
also formed from the start time. Further, during the measurement the
measurement window is superimposed which shows the current pro-
gram line being executed and the remaining line time.
•
Shortly after the start of the determination, the screen shows the prompt
to add 10 mL sample to the measuring vessel.
5
Addition of sample
•
Remove stopper 25
25 on 747 VA Stand and use a pipette to add 10 mL of
drinking water to the measuring vessel through the pipetting opening.
Press the
•
The screen shows the prompt to add 1 mL acetate buffer to the measur-
ing vessel.