Metrohm 746 VA Trace Analyzer - Manual (Page 132)

4.4 Lead determination with internal standard
746 VA Trace Analyzer / 747 VA Stand
4-47
Report Full Printout of the full result report on the printer
Curve Cal Sbst:Pb Printout of the calibration curve on the printer
• Press the softkey . The subpage of "DOCUMENTATION"
appears with the method comment describing, among other things, the
procedure used in the calibration method with the internal standard.
• Finally press the key to return to the main page of "DOCUMEN-
TATION".
4.4.4 Recording the calibration curve
To be able to perform a determination with the internal standard, the proportionality
factor must first be determined using a calibration curve. The following steps are
necessary for this:
1 Switch to dialog page "MONITORING"
• Press the yellow key. The dialog page "MONITORING"
whose header shows the loaded method INTSTD appears.
2 Switch the program run mode to calibration
If the parameter Run mode is set to determination , 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 either * or 10 mL (as preparation for performance of the determi-
nation in section 4.4.5) and confirm this entry with the key.
Although the sample volume for recording the calibration curve is not needed (the
volume of the calibration solutions is defined in the parameter V0.CSoln), the
Sample size/S0 field must not be empty.
4 Start the determination
• Press the red key.
• 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.