Owner manual

4.2 Lead determination with standard addition
746 VA Trace Analyzer / 747 VA Stand
4-19
3
1
st
standard addition
• Remove stopper 2525 and use a pipette to add 100 µµL lead ion standard
solution to the measuring vessel through the pipetting opening. Then
close the pipetting opening with stopper 2525 and press the <ENTER>
key.
• The sample solution spiked with standard addition solution is then
measured:
− Purging and stirring for 30 s
− Wait time 5 s to stabilize the analysis solution
− Call-up of the segment SegPb three times for measured value
acquisition. The three individual measurements are given the VR
numbers 10, 11 and 12.
• On completion of the 3
rd
measurement of the sample solution, the pro-
gram is interrupted. The screen again shows the prompt to add 100 µL
of the standard addition solution PbStd to the measuring vessel:
4
2
nd
standard addition
• Remove stopper 2525 and use a pipette to add 100 µµL lead ion standard
solution to the measuring vessel through the pipetting opening. Then
close the pipetting opening with stopper 2525 and press the <ENTER>
key.
• The sample solution spiked with standard addition solution is then
measured:
− Purging and stirring for 30 s
− Wait time 5 s to stabilize the analysis solution
− Call-up of the segment SegPb three times for measured value
acquisition. The three individual measurements are given the VR
numbers 20, 21 and 22.
• On completion of the 3
rd
measurement and calculation of the results, the
program is ended. The status display in the header of the "MONITO-
RING" dialog page switches back to * READY *, the instrument is ready
for a new determination.
5
Printout of reports and curves
• On completion of the program, the reports and curves entered on the
"DOCUMENTATION" page are put out on the printer.
The printout of reports and curves can be stopped at any time by simultaneously
pressing the <SHIFT> and <PRINT STOP> keys.
ÚÚÄÄÄÄÄÄ
MEAS.TASK MESSAGE
ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿¿
³³
³³
³³
ADD PbStd 100.000 uL > M
press <Esc> to break
³³
³³
³³
ÀÀÄÄÄÄÄÄ <Enter>: continue ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙÙ
ÚÚÄÄÄÄÄÄ
MEAS.TASK MESSAGE
ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿¿
³³
³³
³³
ADD PbStd 100.000 uL > M
press <Esc> to break
³³
³³
³³
ÀÀÄÄÄÄÄÄ <Enter>: continue ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙÙ