Metrohm 746 VA Trace Analyzer - Manual (Page 101)

4 Introduction to the operation
746 VA Trace Analyzer / 747 VA Stand
4-16
4.2.4 Preparing the sample solution
The sample solution for the lead determination is prepared as follows:
1 Addition of 20 mL dist. water
• Add 20 mL dist. or deion. water to the measuring vessel.
2 Addition of 0.5 mL KCl 3 mol/L
• Add 0.5 mL potassium chloride c(KCl) = 3 mol/L to the measuring
vessel.
3 Addition of 100 µµL Pb ion standard solution
• Add 100 µ L Pb ion standard solution ρ(Pb) = 1 g/L to the measuring
vessel (this results in 100 µ g Pb in the measuring vessel).
4.2.5 Settings on the "MONITORING" page
Before the start of the loaded method, the sample volume must be entered on the
"MONITORING" page. Proceed as follows:
1 Switch to dialog page "MONITORING"
• Press the yellow key. The dialog page "MONITORING"
appears:
Method: TESTPb MONITORING * READY *
Title : Pb determination in ion standard solution
Remark 1
Remark 2
Run mode determination Run 0
User name Stand address 1
Auto.samples off 0 of 160 Determination .dtm
Auto.batch off 0 of *
Start interval 0.0 h Modified no
Det.storage off 93.7 % free Sample table -
Pos. Ident.1/S1 Ident.2/S2 Ident.3/S3 Method.call Sample size/S0
Modify
column
Modify
line
Recalc. Check
method
System
window
Error
window
Live
display
• For the determination using the method TESTPb , the adjustable pa-
rameters Run mode , Auto.samples , Auto.batch , Start interval and
Det.storage must have the values shown here. If this is not the case,
they must be changed accordingly.
The dialog page "MONITORING" is used to monitor the operation. Here, various
settings and entries for subsequent determinations can be defined. You will find a
detailed description of this dialog page in section 5.5.1.