Metrohm 746 VA Trace Analyzer - Manual (Page 559)

7 Safety, Errors, Troubleshooting, Diagnosis, GLP
746 VA Trace Analyzer / 747 VA Stand
7-60
7.7.2 Loading the TESTPb.mth method
To load the TESTPb.mth method from the method memory to the working storage,
the following steps are necessary:
1 Switch on instrument
• Switch on the 746 VA Trace Analyzer with mains switch 11 11 at the rear of
the instrument.
2 Switch to dialog page "METHODS"
• Press the yellow key. The dialog page ”METHODS”
appears showing the methods stored in the instrument.
3 Selection of the TESTPb.mth method
• Use the cursor keys to select the TESTPb.mth method, which then be-
comes black-backed.
4 Copying the TESTPb.mth method to the working storage
• Press the softkey . The softkey boar changes and presents the
destinations for copying the selected method.
• Press the softkey . The TESTPb.mth method is copied
to the working storage.
7.7.3 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 (6.2308.020)
• Add 0.5 mL potassium chloride c(KCl) = 3 mol/L to the measuring ves-
sel.
3 Addition of 100 µµL Pb ion standard solution (6.2301.100)
• 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).