Metrohm 746 VA Trace Analyzer - Manual (Page 141)

4 Introduction to the operation
746 VA Trace Analyzer / 747 VA Stand
4-56
4.5 Basic method for DP polarography
This illustrative method can be used to investigate a sample for sub-
stances which can be determined with differential pulse polarography
at the dropping mercury electrode (DME). The basic structure for DP
polarography contained in the method can then be modified and
expanded in any way whatever for the specific determination of one or
more substances.
So that you can perform this example, first the 746 VA Trace Analyzer
and 747 VA Stand must have been prepared as described in section
4.1.
4.5.1 Reagents
The following solutions are needed to perform the method POL.mth :
1 Acetate buffer 1 mol/L, pH 4.6
4.5.2 Loading the method POL.mth
To load the method POL.mth from the method memory into 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. The instrument is initialized. If all is in order, the dialog
page "MONITORING" appears after a few seconds.
2 Switch to dialog page "METHODS"
• Press the yellow key. The "METHODS" dialog page ap-
pears showing the methods stored in the instrument.
3 Selection of the method POL.mth
• Use the cursor keys to select the method
POL.mth
, which then be-
comes black-backed.
4 Copying the method POL.mth to the working storage
• Press the softkey . The softkey bar changes and presents the
destinations for copying the selected method.
• Press the softkey . The method POL.mth is copied to
the working storage.