Owner manual

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:

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:

Switch on instrument

• Switch on the 746 VA Trace Analyzer with mains switch 1111 at the rear of

the instrument. The instrument is initialized. If all is in order, the dialog

page "MONITORING" appears after a few seconds.

Switch to dialog page "METHODS"

• Press the yellow <METHODS> key. The "METHODS" dialog page ap-

pears showing the methods stored in the instrument.

Selection of the method POL.mth

• Use the cursor keys to select the method POL.mth, which then be-

comes black-backed.

Copying the method POL.mth to the working storage

• Press the softkey <Copy to>. The softkey bar changes and presents the

destinations for copying the selected method.

• Press the softkey <Working storage>. The method POL.mth is copied to

the working storage.