Metrohm 746 VA Trace Analyzer - Manual (Page 145)

4 Introduction to the operation
746 VA Trace Analyzer / 747 VA Stand
4-60
6 Addition of acetate buffer
• Use a pipette to add 1 mL acetate buffer (1 mol/L, pH 4.6) to the
measuring vessel through the pipetting opening. Then close the pipet-
ting opening using stopper 25 25 and press the key.
7 Measurement of the sample solution
• Measurement of the sample solution runs as follows (see also section
4.5.3):
− Purging and stirring for 330 s.
− Wait time 5 s to stabilize the analysis solution.
− Call-up of the segment
polaro
for measured value recording.
The single measurement is allocated the VR number 00 .
• On completion of the measurement, the program is at an end. The status
display in the header of the dialog page "MONITORING" switches back
to * READY * , the instrument is ready for a new determination.
8 Printout of the segment curve
• On completion of the program, the smoothed segment curve entered on
the "DOCUMENTATION" page is put out on the printer. The following ex-
ample shows a determination with drinking water as sample:
================== METROHM 746 VA TRACE ANALYZER (5.746.0101) ==================
Method : POL User : Date: 1996-12-10
Mode : DPMODE Determ. : 12101420 Time: 14:20:12
Run : 6
Curve : smoothed Segment : polaro V R : 0 0