Metrohm 746 VA Trace Analyzer User Manual
Page 134
4.4 Lead determination with internal standard
746 VA Trace Analyzer / 747 VA Stand
4-49
measurements for cadmium are allocated the VR numbers
00
,
01
and
02
.
•
After the 3
rd
measurement, the program is interrupted. The screen shows
the prompt to change the measuring vessel:
9
Empty the measuring vessel
•
Empty the measuring vessel, rinse it thoroughly with dist. water and
replace it in the 747 VA Stand.
The measuring vessel contains mercury, which must be disposed of in
the proper manner (see section 7.2.3).
10 Measurement of the 2
nd
calibration solution
•
Repeat steps 5
…
9 with 10 mL of calibration solution
Pb-2
with a
mass concentration of 5
µµg/L. You obtain three single measurements
with the VR numbers
10
,
11
and
12
.
11 Measurement of the 3
rd
calibration solution
•
Repeat steps 5
…
9 with 10 mL of calibration solution
Pb-3
with a
mass concentration of 10
µµg/L. You obtain three single measurements
with the VR numbers
20
,
21
and
22
.
12 Measurement of the 4
th
calibration solution
•
Repeat steps 5
…
9 with 10 mL of calibration solution
Pb-4
with a
mass concentration of 20
µµg/L. You obtain three single measurements
with the VR numbers
30
,
31
and
32
.
•
On completion of the last measurement, the proportionality factor is
calculated from the recorded calibration curve and entered in the dialog
page "SUBSTANCES/Calibration" together with the date and time of the
calibration.
•
The program is now at an end. The status display in the header of the
dialog page "MONITORING" switches back to
* READY *
, the instrument
is now ready for a new determination.
13 Printout of reports and curves
•
On completion of the program, the full report of the calibration is put out
on the printer:
Ъ
ЪДДД
ДДД MEAS.TASK MESSAGE ДДДДДДДДДДДДДДДДДД
ДДДДДДДДДДДДДДДДДД¿
¿
³
³
³
³
³
³
Change measuring vessel
³
³
³
³
³
³
А
АДДД
ДДД
ДДДДДДДДДДДДДДДДДДЩ
Щ