Metrohm 746 VA Trace Analyzer User Manual
Page 116
4.3 Lead determination with calibration curve
746 VA Trace Analyzer / 747 VA Stand
4-31
4.3.3
Method specifications of the method
CALCRV.mth
In this section the 5 dialog pages of the group "Method Specifications" associated
with the loaded method
CALCRV.mth
will be explained in detail. If you are interested
only in a rapid lead measurement, you can proceed directly to section 4.3.4.
1
Switch to dialog page "OPERATION SEQUENCE"
•
Press the yellow <OP. SEQUENCE> key. The dialog page "OPERATION
SEQUENCE" appears with the main program for the lead determination:
Method: CALCRV .mth OPERATION SEQUENCE
Title : Pb determination with calibration curve
Instructions t/s Main parameters Auxiliary parameters
ДДДДДДДДДДДДД
ДДДДДДДДДДДДД ДДДДД
ДДДДД ДДДДДДДДДДДДДДДДДДДДДДДДД
ДДДДДДДДДДДДДДДДДДДДДДДДД
ДДДДДДДДДДДДДДДДДДДДДДДДД
ДДДДДДДДДДДДДДДДДДДДДДДДД
1 D SMPL>M V.fraction mL V.total L
2 C (CAL
3 C CSOLN>M addition into MEAS
4 DOS>M Soln.name Acetate V.add 1.000 mL
5 PURGE
6 STIR 180.0 Rot.speed 2000 /min
7 ØPURGE
8 (REP
9 STIR 5.0 Rot.speed 2000 /min
10 SEGMENT Segm.name DPASV
11 REP)2
12 C RINSE Cycles 1 V.rinse mL
13 C CAL)3
14 END
Modify
column
Modify
line
Delete
instr.
Insert
instr.
Method
labels
•
The following is a brief explanation of the main program sequence:
Line 1
Addition of sample: 10 mL
Line 2
…
…13
Loop for recording the calibration curve (4 calibration solutions)
Line 3
Addition of calibration solution to measuring vessel: 10 mL
Line 4
Addition of acetate buffer to measuring vessel: 1 mL
Line 5
…
… 6
Purging and stirring of the analysis solution for 3 min
Line 7
Switching off the purging
Line 8
…
…11
Loop for double replication of the segment
Line 9
Stirring of the analysis solution for 5 s
Line 10
Call-up of the segment
DPASV for lead determination
Line 12
Resetting of the volume bookkeeping to 0 for solution change
(new calibration solution)
Line 14
End of main program
•
The sequence of the main program depends on the selected mode for
the program run
Run mode
on the "MONITORING" page:
−
In the program run mode
calibration
, all instructions marked with
D
are ignored. 4 calibration solutions are measured in turn and the
coefficients of the calibration curve determined.
−
In the program run mode
determination
, on the other hand, all in-
structions marked with
C
are ignored. The sample is measured and
its mass concentration then determined using the calibration curve
recorded earlier.