Metrohm 746 VA Trace Analyzer - 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 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
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instr.
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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.