Owner manual

4 Introduction to the operation
746 VA Trace Analyzer / 747 VA Stand
4-44
Method: INTSTD .mth OPERATION SEQUENCE
Title : Pb determination with internal standard (Cd)
Instructions t/s Main parameters Auxiliary parameters
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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 RADD>M Soln.name CdRefSol V.add 0.100 mL
6 PURGE
7 STIR 180.0 Rot.speed 2000 /min
8 ØPURGE
9 (REP
10 STIR 5.0 Rot.speed 2000 /min
11 SEGMENT Segm.name DPASV
12 REP)2
13 C RINSE Cycles 1 V.rinse mL
14 C CAL)3
15 END
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• The following is a brief explanation of the main program sequence:
Line 1 Addition of sample: 10 mL
Line 2 ……14 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 Addition of the internal standard to the measuring vessel:
0.1 mL Cd standard solution 1 mg/L
Line 6 …… 7 Purging and stirring of the analysis solution for 3 min
Line 8 Switching off the purging
Line 9 ……12 Loop for double replication of the segment
Line 10 Stirring of the analysis solution for 5 s
Line 11 Call-up of the segment DPASV for lead determination
Line 13 Resetting of the volume bookkeeping to 0 for solution change
(new calibration solution)
Line 15 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. Internal standard is added to 4 calibration solutions in
turn and lead and cadmium measured each time. The proportional-
ity factor between lead and cadmium is determined from the re-
corded calibration curve.
− In the program run mode determination, on the other hand, all in-
structions marked with C are ignored. Internal standard is added to
the sample and then lead and cadmium measured. The lead mass
concentration is calculated using the proportionality factor deter-
mined beforehand.