Metrohm 746 VA Trace Analyzer - Manual (Page 96)

4.2 Lead determination with standard addition
746 VA Trace Analyzer / 747 VA Stand
4-11
The dialog page "OPERATION SEQUENCE" contains a sequence of program
instructions which can be freely combined. Most of the instructions also have certain
main and auxiliary parameters as well as optional entry of a line time. A total of 88
different program instructions can be used to program any type of determination.
You will find further information regarding this dialog page in section 5.6.1 and a
detailed description of all program instructions in section 5.7.3.
• The following is a brief explanation of the main program sequence:
Line 1 … … 2 Addition of 20 mL dist. water and 0.5 mL KCl 3 mol/L
Line 3 … … 4 Addition of sample: 100 µ L Pb ion standard 1 g/L
Line 5 … … 6 Purging and stirring of the analysis solution for 5 min
Line 7 … …16 Loop for double standard addition
Line 8 … … 9 Purging and stirring of the analysis solution for 30 s
Line 10 … …11 Switch off purging and stirring, stabilization of the
analysis solution for 5 s
Line 12 … …14 Loop for duplicate replication of the segment
Line 13 Call up of the segment SegPb for lead determination
Line 15 Addition of standard addition solution:
100
µ L Pb ion standard 1 g/L
Line 17 End of main program
2 Switch to dialog page "SEGMENT"
• Press the yellow key. The dialog page "SEGMENT"
appears with the program for measured value acquisition:
Method: TESTPb SEGMENT
SegPb
Instructions t/s Main parameters Auxiliary parameters
ДДДДДДДДДДДДД ДДДДДДДДДДДДД ДДДДД ДДДДД ДДДДДДДДДДДДДДДДДДДДДДДДД ДДДДДДДДДДДДДДДДДДДДДДДДД
ДДДДДДДДДДДДДДДДДДДДДДДДД ДДДДДДДДДДДДДДДДДДДДДДДДД
1 DME
2 DPMODE U.ampl -50 mV t.meas 20.0 ms
t.step 0.40 s t.pulse 40.0 ms
3 SWEEP 24.8 U.start -200 mV U.step 6 mV
U.end -550 mV Sweep rate 15 mV/s
4 ØMEAS U.standby mV
5 END
Modify
column
Modify
line
Delete
instr.
Insert
instr.
Select
segment
Delete
segment
Plot
param.
Segment
name
The dialog page "SEGMENT" also contains a freely combinable sequence of program
instructions with associated parameters and an optional line time. A segment is used
primarily for the programming of the measured value acquisition (sweep) and is called
up in the main program with the SEGMENT instruction. Per method max. 8 different
segments can be defined, but only 1 sweep is admissible per segment.
You will find further information regarding this dialog page in section 5.6.2 and a
detailed description of all program instructions in section 5.7.3.