inoLab
®
Multi 9620 IDS Ion concentration
ba77173e04 12/2017 67
7.3.5 Standard addition with blank value correction
(Blank value addition)
In the "Standard addition with blank value correction" procedure, a known
amount of standard solution is added to the sample in two steps.
The ion concentration in the linear range of the electrode characteristic curve
is increased with the first addition.
The second addition is equivalent to the standard addition. The ion concentra-
tion in the sample is calculated from the change in potential.
Calibration
Measurement
1. Select the measuring method (see section 7.3 S
ELECTING THE MEASUR-
ING METHOD, page 56).
2. Prepare two standard calibration solutions.
3. Perform a two-point calibration according to user guidance.
4. The calibration record is displayed as soon as a stable value is
achieved for the second standard calibration solution.
01.09.2017 08:00
01.09.2017 08:00
#1 0.010 mg/l 358.1 mV 25.0 °C
#2 0.020 mg/l 374.4 mV 25.0 °C
Slp.: 54.1 mV
Sensor +++ (Ion type: Ag)
CALIBRATION
ADA 94/IDS DIN
B092500013
5. Start the measurement with <F1> Continue
An entry window appears.
6. Prepare the sample.
7. If necessary, add the ISA/TISAB solution to the sample.
8. Thoroughly rinse the electrode with deionized water.
i
Immerse sensor in sample
Sample volume 100.0 ml
ISA/TISAB vol. 1.0 ml
BV volume 100.0 ml
BV conc. 1.000 mg/l
Continue
Blank value addition
01.09.2017 08:00
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