YSI MultiLab 4010-2 - Manual (Page 59)

MultiLab 4010-2 Ion concentration
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7.3.2 Standard subtraction
In the "Standard Subtraction" procedure, a known amount of standard solution
is added to the sample (as complexing agent or precipitating agent) and, thus,
the ion concentration lowered.
The ion concentration in the sample is calculated from the change in potential.
Calibration
Measuring
1. Select the measuring method (see section 7.3 S ELECTING THE MEASU -
RING 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.
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#1 0.010 mg/l 20.2 mV 25.0 °C
#2 0.020 mg/l 79.2 mV 25.0 °C
Slp.: 54.1 mV
Sensor +++ (Ion type: Ag)
CALIBRATION
ADA 94/IDS BNC
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
continue
Standard subtraction
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