YSI TruLab 1320P - Manual (Page 56)

Ion concentration TruLab pH/ISE 1320
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8.3.2 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 8.3 S ELECTING THE MEASUR -
ING METHOD
, page 53).
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.
CALIBRATION
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#1 0.010 mg/l
20.2 mV 25.0 °C
#2 0.100 mg/l 79.2 mV 25.0 °C
Slp.: 59.0 mV
Sensor +++ (Ion type: Ag)
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12:12
Continue USB output
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.
9. Immerse the electrode in the sample.
i Immerse sensor in sample
Sample volume 100.0 ml
ISA/TISAB vol. 1.0 ml
Continue
Standard subtraction
12.12.2012
12:12
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