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Ion concentration pH/ION 7320
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8.3.1 Standard addition
In the "Standard addition" procedure, a known amount of standard solution is
added to the sample.
The ion concentration in the sample is calculated from the change in potential.
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
++ (Ion type: Ag)
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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.
10. Using <

> <

> and <MENU/ENTER> , select the values for the vol-
ume of the sample ( Sample volume ) and the volume of the ISA/TISAB
solution ( ISA/TISAB vol. ).
i
Immerse sensor in sample
Sample volume 100.0 ml
ISA/TISAB vol. 1.0 ml
Continue
Standard addition
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12:12
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