YSI TruLab 1320P - Manual (Page 61)

TruLab pH/ISE 1320 Ion concentration
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8.3.4 Sample subtraction
With the "Sample subtraction" procedure, a known amount of sample is added
to the standard solution (complexing agent or precipitating agent).
The ion concentration in the sample is calculated from the change in potential.
The sample subtraction is one method for the indirect determination of ions. It
is used for the determination of ions for which no direct determination is possi-
ble.
Calibration
1. Select the measuring method (see section 8.3 S
ELECTING THE MEASUR
-
ING METHOD , page 53).
2. If necessary, set the ion type for the ion in the standard (Ion type (sub))
with <> <> and
On selection of the ion type that can be defined (ION):
Using <> <> and
3. Select Continue with <> <> and confirm with
i Set the ion type for the standard.
Ion type S
Continue
Sample subtraction
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4. Prepare two standard calibration solutions.
5. Perform a two-point calibration according to user guidance.
6. 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
79.2 mV 25.0 °C
#2 0.100 mg/l 20.2 mV 25.0 °C
Slp.: -59.0 mV
Sensor +++ (Ion type: S)
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