Ion concentration
TruLab pH/ISE 1320
62
ba76161e01
08/2015
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
2.
If necessary, set the ion type for the ion in the standard (
Ion type (sub)
)
with
<
> <
>
and
<MENU/ENTER>
.
On selection of the ion type that can be defined (ION):
Using
<
> <
>
and
<MENU/ENTER>
, set the valence (
Valency
) and
molar weight (
Molar mass
) for the ion in the standard solution.
3.
Select
Continue
with
<
> <
>
and confirm with
<MENU/ENTER>
.
i
Set the ion type for the standard.
Ion type
S
Continue
Sample subtraction
12.12.2012
12:12
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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
12.12.2012 12:12:12
#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
++ (Ion type: S)
12.12.2012
12:12
Continue
USB output
Содержание YSI pH/ISE 1320P
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