inoLab pH/ION 735
Operation
51
4.5.8
Sample addition (
Sample add.
)
In the "Sample addition" procedure, a known amount of sample is add-
ed to the standard solution.
The ion concentration in the sample is calculated from the change in
potential.
Measuring
1
Select the measuring method (see section 4.5.5).
2
Prepare two standard calibration solutions.
3
Perform a two-point calibration according to the user guidance.
4
As soon as a stable value is achieved for the second standard
calibration solution, the slope (mV) and evaluation (+ ... +++) of
the electrode after calibration is displayed.
i
Slope =
33.6 mV
i
Sensor
+++
Accept
ISE <CAL>
5
Start the measurement with
g
.
An entry window appears.
6
Thoroughly rinse the electrode with deionized water.
7
Immerse the electrode in the standard.
8
Using
82
and
g
, enter the values for the volume of the
standard solution (
Std. volume
), the concentration of the stan-
dard solution (
Std. concentration
) and the volume of the ISA/TI-
SAB solution (
ISA/TISAB vol.
).
9
Select
Continue
with
82
and start the measurement with
g
.
When the measurement is finished an info window appears.
i
Immerse sensor in std.
Std. volume
100.0 ml
Std. concentration
1.0 mg/l
ISA/TISAB vol.
1.0 ml
Continue
Sample addition
