Ion concentration
ProLab 4000
134
ba75646e03
12/2012
9.6.7
Blank value addition
(Standard addition with blank value correction)
In the "Standard addition with blank value correction" procedure, a
known amount of standard solution is added to the sample in two steps.
With the first addition, the ion concentration is raised to the linear range
of the electrode characteristic curve.
The second addition is equivalent to the standard addition.
The ion concentration in the sample is calculated from the change in
potential.
Calibration
1
Check the currently displayed ion.
If the ion to be measured is displayed incorrectly:
Select the ion type in the menu,
Measuring
/
ISE methods
/
Ion
type
.
2
In the
Measuring
/
ISE methods
menu, select the method,
Blank value addition
.
3
Carry out a two-point calibration according to the user guid-
ance (see page 106).
As soon as a stable value is achieved for the second standard
calibration solution, the slope (mV) and evaluation (Error, +++)
of the electrode after calibration is displayed.
The infotext,
Accept calibration and terminate
is displayed.
4
Using
[OK]
, confirm the infotext
Accept calibration and termi-
nate
.
The calibration record is displayed and output to the interface.
The calibration procedure is finished.
5
Close the calibration record with
[OK]
.
The
ISE method
: The
Blank value addition
window pops up.
The
Sample
register is displayed.
Summary of Contents for ProLab 4000
Page 4: ...ProLab 4000 4 ba75646e03 12 2012...
Page 10: ...Contents ProLab 4000 10 ba75646e03 12 2012...
Page 20: ...Overview ProLab 4000 20 ba75646e03 12 2012...
Page 30: ...Commissioning ProLab 4000 30 ba75646e03 12 2012...
Page 68: ...System functions ProLab 4000 68 ba75646e03 12 2012...
Page 138: ...Ion concentration ProLab 4000 138 ba75646e03 12 2012...
Page 184: ...Recorder ProLab 4000 184 ba75646e03 12 2012...
Page 202: ...What to do if ProLab 4000 202 ba75646e03 12 2012...
Page 216: ...Lists ProLab 4000 216 ba75646e03 12 2012...
Page 227: ......