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TitraLab
®
Direct ISE
measurement
method - notes
Direct ISE
measurement
method -
programmation
Direct
measurements
Page 96
The accuracy of the measurements using a Direct ISE method
depends on the following elements:
• The concentrations of the standards used for a 2-point calibration
must lie on either side of the samples to be measured.
• For calibration using more than 2 standards, one of the standard
concentration must lie in the non-linear response zone of the ISE
electrode.
• If you want to measure low concentrations (values situated in the
non-linear response zone), run a 2 or 3-point calibration in the non-
linear response zone of the electrode.
• It is recommended to measure sample concentrations above the
C
limit.
0
• A high value found for C
your standards and electrode).
• A similar ionic strength must be found in both standards and
samples (add a supporting electrolyte in the standards and
samples).
• The samples must not contain a significant amount of interfering
ions.
• Use the same temperature for your standards and samples
(thermostate the solutions).
How to edit a Direct ISE measurement method?
see "Direct ISE measurement method - programmation", page
How to run a Direct ISE measurement method?
Refer to "Running a method", page
What is a Direct ISE measurement method?
see "Direct ISE measurement method - definition", page
Proceed as follows to edit a Direct ISE measurement method:
1. From the Main window, press 4 then 2 Edit method.
2. For Mode, select Measurement.
3. For Measurement, select Direct ISE.
4. Define the other parameters of this measurement method.
What is a Direct ISE measurement method?
see "Direct ISE measurement method - definition", page
How to run a Direct ISE measurement method?
Refer to "Running a method", page
Refer to "Display measurement", page
TitraLab 870 Reference Manual
may undergo false measurements (check
0
216.
216.
98.
96.
95.
95.
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