Radiometer Analytical TitraLab 870, Reference Manual

Page: 143 / 286

Titra Lab ® TitraLab 870 Reference Manual
Page 143
ISE Standard
addition method
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programmation Proceed as follows to edit an ISE standard addition method:
1. From the Main window, press 4 then 2 Edit method.
2. For Mode , select Measurement .
3. For Measurement , select ISE Std Addition .
4. Use the LEFT/RIGHT arrow keys to move to the last Edit method
display.
5. Press 1 Method parameters.
6. Select the ISE electrode, the standard addition ID and the number
of additions to be performed (from 1 to 9).
7. At the line Std add volume:
• select Programmed then enter the volume of one addition
(in ml),
• or select Automatic then enter the potential jump due to all n
additions (n = 1 to 9).
The TIM870 calculates the volume to be poured for each addition.
To avoid modifying the ionic strength of the solution by dilution
effect, it is recommended to add small amounts of standard.
The addition cumulate volumes should not exceed 10% of the
sample test quantity.
In an ISE Standard addition method with automatic
determination of the volumes, if the cumulate volumes
calculated is higher than 50 % of the sample test quantity, the
analysis stops and the instrument calculates the results with
the data available. A
Vstd>max note is added to the result
value to show that the cumulate volumes of the standard
additions is higher than 50 % of the sample test quantity.
8. Define the other parameters of this measurement method.
What is an ISE Standard addition measurement method?
see "ISE Standard addition method - definition", page 142 .
How to run an ISE standard addition method?
Refer to "Running a method", page 216 .