Thermo Scientific VSTAR-ISE, Справочное руководство

Страница: 26 / 44

22
Thermo Scientific Orion VERSA STAR pH/ISE/Temperature Module
Analyte Addition and Subtraction
In Analyte Addition, the first measurement is in a known standard solution containing the same type of analyte in
interest as the sample. The second measurement follows the addition of the unknown solution. The concentration of
the unknown is then calculated.
In Analyte Subtraction, the first measurement uses known standard solution containing the type of ions that the ISE
can measure and that will complex with the analyte in interest in the unknown sample. The second measurement
follows the addition of the unknown sample that reduces the concentration of the ions in the measurement solution.
The concentration of the analyte in interest in the unknown is then calculated.
• Isopotential value needs to be known and entered.
• Blank correction is not applied.
• The slope value at 25°C needs to be known and entered.
To Access Incremental Techniques
1. Set the measurement mode to ISE.
2. Press f3 (setup) key.
3. Use the arrow keys to highlight the ISE channel. Press
f3 (select)
.
4. Use the arrow keys to highlight Incremental Techniques and press f3 (select) .
5. Follow the onscreen prompts.