132
Ion Operation:
Analate Subtraction Method
XL25, 50 and 60 meters
Measuring Concentration in Samples Using the Analate Subtraction Method
The analate subtraction method is useful when no ion specific electrode is available to measure
the ion of interest directly. Like known subtraction the sample and the standard contain different
ionic species. However, the ion being measured is in the standard and not in the sample. The
reduction of free ions in the standard solution is proportional to the concentration of the ion of
interest in the sample. See ISE Theory on
‘Appendix: ISE Theory’
section.
Taking an Analate Subtraction Measurement
1. Immerse the ion selective electrode in a known volume of the standard solution.
2. Stir the standard.
3. Wait for the reading to stabilize (
STABLE
will appear). Touch
AS
to take the first reading.
4. Add a known volume of sample solution to the standard.
5. Wait for the reading to stabilize (
STABLE
will appear). Touch
AS
to take the second
reading.
6. Use the keypad to enter the sample volume.
7. Touch
Enter
to accept the value.
8. Use the keypad to enter the standard volume.
9. Touch
Enter
to accept the value.
10. Use the keypad to enter the volume of ionic strength adjuster used. If no ISA was used,
enter a value of zero.
11. Touch
Enter
to accept the value.
12. Use the keypad to enter the concentration of the standard solution.
13. Touch
Enter
to accept the value. Your Analate Subtraction result is now displayed.
14. Touch
to send the data to a printer
OR
Touch
OK
to return to the Measure screen for a new measurement.
Содержание XL 20
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