
130
Ion Operation:
Analate Addition Method
XL25, 50 and 60 meters
Measuring Concentration in Samples Using the Analate Addition Method
The analate addition method is useful when your sample is at an elevated temperature and you
want to negate the effect that temperature will have on the concentration calculation. This method
is also useful if you have only a small amount of sample available.
The analate addition method differs only slightly from the known addition method (see
‘Ion
Operation: Known Addition Method’
section). The difference is the solution that you are taking
your initial mV reading in is actually the standard and not the sample of interest. The difference in
mV readings of the standard before and after the sample is added is used to calculate the
concentration of the ion of interest. With the analate addition method, both the sample and the
standard solution contain the ionic species of interest. See ISE Theory on
‘Appendix: ISE
Theory’
section.
Taking an Analate Addition 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
AA
to take the first reading.
4. Add a known volume of sample solution to the standard solution
5. Wait for the reading to stabilize (
STABLE
will appear). Touch
AA
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 Addition 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.
Summary of Contents for XL 20
Page 1: ......
Page 138: ...127 Ion Operation Known Addition Method XL25 50 and 60 meters...
Page 140: ...129 Ion Operation Known Subtraction Method XL25 50 and 60 meters...
Page 142: ...131 Ion Operation Analate Addition Method XL25 50 and 60 meters...
Page 144: ...133 Ion Operation Analate Subtraction Method XL25 50 and 60 meters...