Xylem ProLab 4000 MULTIPARAMETER BENCHTOP METER - Manual (Page 116)

Ion concentration ProLab 4000
116 ba75646e02 01/2010
9.6.3 Double standard addition
In the Double standard addition procedure, a known amount of stan-
dard solution is added to the sample in two steps.
First, one percent of the sample volume is added, then 2 percent of the
sample volume is added.
The ion concentration in the sample is calculated from the change in
potential between the first and second addition of standard solution.
Measuring
15 Change the displayed unit of the measured value with [Unit] if
necessary.
16 If required, display the record of the current measurement with
[Record].
17 Start measuring further samples with [Continue].
Repeat the steps 5 - 15 for all samples.
or
Terminate the measuring method with [Cancel] and confirm the
safety query with [OK].
Measurement with the selected method is completed.
1 Check the currently displayed ion.
If the ion to be measured is displayed incorrectly:
Select the ion type in the menu, Measuring / ISE methods / Ion
type.
2 In the Measuring / ISE methods menu, select the method, Dou-
ble standard addition.
The ISE method: The Double standard addition window pops
up.
The Sample register is open.