YSI TruLab 1320P - Manual (Page 63)

TruLab pH/ISE 1320 Ion concentration
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8.3.5 Standard addition with blank value correction (Blank value
addition)
In the "Standard addition with blank value correction" procedure, a known
amount of standard solution is added to the sample in two steps.
With the first addition, the ion concentration is raised to the linear range of the
electrode characteristic curve.
The second addition is equivalent to the standard addition. The ion concentra-
tion in the sample is calculated from the change in potential.
Calibration
17. If necessary, start measuring further samples with
Repeat steps 8 - 16 for all samples.
18. Terminate the measuring method with .
A safety query appears.
19. Select Yes with <> <>.
20. Confirm Yes with
Measurement with the selected method is completed.
1. Select the measuring method (see section 8.3 S
ELECTING THE MEASUR
-
ING METHOD
, page 53).
ISE
0.321
24.8 °C
Ag
12.12.2012
12:12
Sample subtraction
mg/l
USB output
2. Prepare two standard calibration solutions.
3. Perform a two-point calibration according to user guidance.
4. The calibration record is displayed as soon as a stable value is
achieved for the second standard calibration solution.