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Function and design
3.6.2
Daily factor
3.6.3
Calibration method
TC/NPOC
TIC
TOC
32
Take the blank value of the preparation water into account during single point calibra-
tion.
Calibration with a standard solution can be checked and corrected via the daily factor.
The software multiplies all subsequent measurement results with this factor.
The daily factor F is calculated in accordance with the following formula:
F = c
/c
target
actual
Each parameter (TC, TOC, TIC, etc.) of a method can be calibrated in the multiWin soft-
ware. Not all parameters require calibration, however.
You can store up to three calibration functions for different concentration ranges for
each parameter in a method. The software automatically assigns the measurement re-
sults to the correct calibration range.
The software determines the calibration function in relation to mass m per injected
sample. It determines linear or quadratic calibration functions in accordance with the
following equations via regressive calculation:
Linear calibration function: c = (k
Quadratic calibration function: c = (k
c: target concentration of the standards
V: Sample volume
I
: Net integral
Net
k
, k
, k
: calibration coefficient
0
1
2
The net integral is the raw integral corrected by the blank value of the preparation wa-
ter.
You can specify the regression type (linear or quadratic). Individual measuring points or
measured values for the calculation of the current calibration (manual outlier selection)
can be selected. If necessary, you can define individual standards again, or also add ad-
ditional measurement points to the calibration.
Up to 20 calibration points can be used, with a tenfold determination per calibration
point. The calibration function can be determined either from the average values of the
repeat measurements or from all individual determinations.
The TC channel is calibrated directly for the TC parameter, and after sample purging for
the NPOC parameter.
The concentration c
is proportional to integral I
TC
The TIC channel is calibrated.
The following applies: c
TIC
The calculated parameters appear in the method in the TIC analysis channel. The calcu-
lation of the analysis results is based on the calculated calibration function.
The TOC is determined with the differential method (TOC Diff). Generally, separate cali-
bration functions are determined for the TC and TIC channels.
The calculation of the analysis results is based on the calculated calibration functions for
TC and TIC. The TOC content results from the following formula:
x I
+ k
)/V
1
Net
0
2
x I
+ k
x I
2
Net
1
: c
TC
= f(I
)
TIC
multi N/C 2100S (duo, pharma)
+ k
)/V
Net
0
= f(I
).
TC
TC
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