multi N/C 2100S Function and setup
39
The blank value for the preparation water is also considered when determining the daily
factor.
If the sample needs to be diluted the blank value of the dilution water might also be of
interest. This value can be determined separately and entered manually in multiWin.
The blank value of the dilution water will then be considered automatically when
calculating the concentration of diluted samples.
This value can change over time and must be redetermined before the start of each
measuring series. Otherwise the value last entered will be used.
The dilution blank value is always specified in multiWin standardized to 1 ml.
For every measurement the actual dilution water integer (I
VdBW
) is calculated from the
dilution blank value in accordance with the sample volume and the dilution ratio used
(equation (15)) and deducted from the experimentally determined raw integer
(equation (16)). The raw integer determined for each measurement I
raw
is corrected by
the blank value of the dilution water used.
=
(13)
=
(14)
V
DBV…
Diluting blind value
V
Sample…
Sample volume
I
eff
… Effective integer
I
raw
… Raw integer
I
DBV
… Dilution water integer
Parts of the primary sample in the total parts (e. g. 10 parts in 100 parts), i.e. e.g. 10 ml
primary sample are diluted with dilution water to a total volume of 100 ml.
For a dilution ratio 1:1 the result is I
Dbv
= 0
To calculate the sample concentration c the sample volume and the dilution ratio are
used (equation (15)).
=
(15)
For the linear calibration function (equation (6)) the result is then equation (16).
=
(16)
The integer values determined for a sample can be easily entered. If the primary sample
has been diluted and the dilution ratio entered in multiWin, the concentration of the
primary sample is specified in the analysis report.
Water to dilute solutions
diluting blind value
Use of the dilution blank
value
Definition of the dilution
Calculation of the sample
concentration:
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