Metrohm viva 1.0 (process analysis) - Manual (Page 628)

5.6 Evaluation subwindow
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616 ￭￭￭￭￭￭￭￭
viva 1.0 (for Process analysis)
Units for results
Name Symbol Unit
Mass m g
Volume V L
Mass concentration c g/L
Volume concentra-
tion c L/L
Substance concentra-
tion c mol/L
Time t s
Current I A
Amount of substance n mol
Electrical charge Q C = As
Electrical potential U V = WA -1
5.6.7.2 Result calculation from calibration curves and error calculation
For all three possible calibration methods, the concentration (e.g. a mass
concentration, a volume concentration or a molar concentration) must be
determined in the measuring vessel with the help of a calibration curve.
This calibration curve itself must be determined by the measurement of
solutions for which the concentrations are known. The parameters for a
specified linear or non-linear curve function are then calculated from the
value pairs Evaluation quantity / concentration. Because of the fact
that, as a general principle, the calculations of the calibration curves and
of the results based upon them, in addition to the associated error calcula-
tion, remain the same for all calibration methods, the calculation proce-
dure that is applied shall be described in general terms in the following.
The connection between the variables x and y are sought on the basis of
the measured values x
i
, y
i
, for which it is assumed that the following pre-
requisites apply: