Metrohm viva 1.1 (ProLab) - Manual (Page 1062)

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1050 ￭￭￭￭￭￭￭￭
viva 1.1 (for process analysis)
Calibration
Way in which the content of the substances in the sample is determined
from their evaluation quantities.
Calibrator
The 894 Professional CVS is equipped with a built-in calibrator with pre-
cisely specified reference values that are defined in the corresponding cali-
bration certificate. This innovative component permits the performance of
voltammetric measurements with increased reliability and precision. The
measuring input of the 894 Professional CVS is automatically adjusted to
the reference values of the calibrator before each measurement and thus
yields stable, precise and reproducible results over a long period, even
under suboptimal measuring conditions. In this way, the 894 Professional
CVS automatically recalibrates itself before each measurement.
Chloride potential
Potential at which the value for the current in the bath is measured (usu-
ally 1.125 V in anodic direction). This value correlates with the chloride ion
concentration in the electroplating bath.
Command variable
Variable generated by a command in the method run (see Chapter
2.3.3.4, page 30).
Command
Smallest subset of a track; defines a single step in the method run.
Contamination potential
Potential at which the value for the current in the bath is measured (usu-
ally 1.475 V in anodic direction). This value correlates with the concentra-
tion of the organic degradation products in the electroplating bath.
DT (Dilution Titration)
Calibration method based on a dilution titration and mainly used for sup-
pressor determination in electroplating baths. It consists of a two-stage
process, in which a calibration is first carried out with a suppressor stan-
dard solution before the sample solution is measured.
Calibration with standard
For the calibration, a basic solution with no added organic substances,
called VMS (Virgin Make-up Solution), is measured first (see Glossary,
page 1059). The area of the oxidation peak obtained with the anodic
sweep is evaluated and the charge is calculated. This charge is used as
start value Q(0) for the further calibration. Small amounts of a diluted sup-
pressor standard solution are then dosed into the basic solution. The peak