Appendix
XD 7500
170
ba77191e01 - 71310060
04/2018
9
Appendix
9.1
Glossary
Absorbance
Logarithmic dimension for the absorption of the sample;
negative decadic logarithm of the transmission.
Analysis instructions
The exact proceeding to carry out the detection procedure is
described in the analysis instructions.
AQA
Analytic quality assurance (DeviceCheck).
Barcode
Optical code (black and white bars) of the method that can be read by
light barriers in the photometer. The XD 7x00 instruments use two
kinds of barcodes. One is on the labels of the 16 mm round cells, the
other is a code 128 barcode, which is in the method description and
on the reagent packaging.
Baseline
Reference value for the spectrum of reference absorbances or refer-
ence transmissions.
Cell
Vessel to take a liquid sample for measurement in a photometer.
The cell material (mostly glass) must have certain optical features to
be suitable for photometry.
Citation forms
Different display formats that can be derived from each other of the
measured value for a concentration.
The method for the determination of phosphate, e.g. supplies a mea-
sured value for phosphorous P. This measured value can alterna-
tively be given in the citation forms PO4, PO4-P or P2O5.
Concentration
Mass or amount of a dissolved substance per volume, e. g. in g/L or
mol/L.
Correlation coefficient
Specifies the extent of the linear relationship of value pairs when
determining the zero point and slope for a user-defined method.
Detection procedure
The detection procedure designates the general principle of how a
sample is brought into a form suitable for measurement.
Different methods can be based on the same detection procedure.
DeviceCheck identifier
Measurement values are provided in the documentation with a
DeviceCheck identifier (PCheck or MCheck), depending on whether
and with which DeviceCheck level the measurement was done.
Kinetics
Measurement over a period of time.
MCheck
Checking of the instrument together with the method in the course of
analytic quality assurance
Measured value
The measured value is the special value of a measured parameter to
be determined. It is specified as product of numeric value and unit
(e. g. 3 m; 0,5 s; 5,2 A; 373,15 K).
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