Xylem photoLab 6600 UV-VIS - Manual (Page 175)

photoLab
®
6600 UV-VIS Appendix
175 ba75848e01 08/2009
A.2 Glossary
Absorbance Logarithmic dimension for the absorption of the sample;
negative decadal logarithm of the transmission.
Analysis instructions The exact proceeding to carry out the detection procedure is descri-
bed in the analysis instructions.
AQA Analytical Quality Assurance.
AQA labeling In the documentation, measured values are given an AQA labeling
(AQA1 or AQA2), depending on whether or not the measurement was
carried
out with AQA and with which AQA level.
AQA1 1st step of the analytical quality assurance:
Monitoring of the instrument.
AQA2 2nd step of the analytical quality assurance:
Monitoring of the total system.
AQA3 3rd step of the analytical quality assurance:
Check of whether the photometric determination is disturbed by other
sample ingredients (sample matrix).
The MatrixCheck can be carried out by spiking or diluting:
AutoSelector Plastic cylinder with bar code. It is inserted in the round cell shaft and
transmits the code for a reagent test set to the photometer.
Bar code Optical code (black and white bars) of the method that can be read by
light barriers in the photometer.
Baseline Reference value for the spectrum of reference absorbances or refe-
rence
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 forms of representing a measured concentration value that
can be derived from each other.
The method for the determination of phosphate, e.g. supplies a
measured
value for phosphorous P. This measured value can alternatively
be given in the citation forms PO4, PO4-P or P2O5.
CombiCheck Multiparameter standards used to check the total system for a
method.
Concentration Mass or amount of a dissolved substance per volume, e.g. in g/l or
mol/l.