Xylem photoLab 6100 VIS User Manual
Page 178
Appendix
photoLab
®
6100 VIS
178
ba75847e01
08/2009
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.
Kinetics
Measurement over a period of time.
MatrixCheck
see AQA3.
Measured value
The measured value is the special value of a measured parameter to
be determined. It is given as a combination of the numerical value and
unit (e.g. 3 m; 0.5 s; 5.2 A; 373.15 K).
Method
A method comprises a chemical detection procedure and special
method data (calibration line) that is required to evaluate the
measurement results.
How to carry out the method up to measuring with the photometer is
described in the analysis instructions.
The photoLab
®
6100 VIS contains a database with methods. Further-
more, user-defined methods can be entered in the database as well.
PhotoCheck standard
Stable color solution with defined absorbance values for the check of
the photometer.
Reagent blank value
The evaluation of the photometric measurement always refers to the
comparison value of a test sample without the substance to be deter-
mined (reagent blank value). Thus the influence of the basic absor-
bance of the reagents on photometric measurement is compensated
for.
Recovery
The recovery rate is the found measured value divided by the default
value (percentage).
Example: Default value 20 mg/l; Found 19.7 mg/l => recovery 0.985
or recovery rate 98.5%.
Reference absorbance
With the reference absorbance, the basic absorbance stored in the
photometer can be replaced by a measurement of your own.
Reset
Restoring the original condition of all settings of a measuring system.
Sample blank value
Absorbance value of the original test sample, handled according to
prescription but without color reagent.
Spectrum
Distribution of the intensity, transmission or absorbance depending
on the wavelength.
Standard
Sample with a defined concentration of the analyte to be determined.
Test sample
Designation of the test sample ready to be measured. Normally, a test
sample is made by processing the original sample. The test sample
and original sample are identical if the test sample was not pro-
cessed.