XD 7500
Appendix
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04/2018
Method
A method comprises a chemical detection procedure and special
method data (calibration line) 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 XD 7500 contains a database with methods. Furthermore, user-
defined methods can be entered in the database as well.
PCheck
Checking of the instrument in the course of analytic quality assurance
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: Specified value 20 mg/l; found 19.7 mg/l => refinding 0.985
or refinding 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.
SCheck
Check of the influence of the sample matrix on the results in the
course of analytic quality assurance
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.
Test set (test)
A test set contains all reagents that are required for the photometric
determination of the sample according to the analysis instructions.
Transmission
The part of the light that goes through the sample.
Turbidity
Light attenuation caused by diffuse scattering at undissolved sub-
stances.
ValidCheck
®
Standard solutions for checking the method.
Zero adjustment
Adjusting a photometer with a water-filled cell.
