Xylem photoLab 6600 UV-VIS - Manual (Page 131)

photoLab
®
6600 UV-VIS Operation
131 ba75848e01 08/2009
Practical
instructions
z After evaluating the measured value of the sample the photometer
suggests for the MatrixCheck to spike or dilute the sample and standard
with suitable volumes.
You can change the suggested values of the volumes for the sample and
standard. The photometer checks your entries and informs you of errors
(e.g. if a nominal value is outside the measuring range of the test).
For each spiking or dilution, the relevant nominal concentration value is
displayed.
z To be able to reliably recognize matrix effects by spiking, the volume
increase after spiking should be small.
z To be able to reliably recognize matrix effects by diluting, the dilution factor
should be high.
z You can carry out the MatrixCheck as a series of measurements,
consisting of up to three determinations with different spiking volumes or
dilutions respectively.
z Prepare all test sample solutions simultaneously at the beginning of the
series of measurements.
Overview of the
AQA3/MatrixCheck
The MatrixCheck consists of the following parts:
z Configuring settings in the AQA3/MatrixCheck setup menu.
– Specify the maximum deviation from the nominal value after spiking or
diluting (default setting: 10%)
z Carrying out the AQA3 / MatrixCheck
Specifying the
maximum deviation
from the nominal
value
The assessment of the recovery rate is determined with the maximum
deviation from the nominal value. The assessment of the recovery rate is
displayed next to the recovery rate after the check has been carried out.
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Concentration
– [Setup]
– AQA
– AQA3/MatrixCheck
setup
– Maximum difference