4 sample blank – Hach-Lange DR 6000 User Manual User Manual
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Standard programs
5.5.4
Sample blank
Turbidity and colour in the sample matrix can falsify the results of
a photometric analysis. The interference factors come from the
sample or are created by reactions with the reagents.
The influence of turbidity and/or colour can be eliminated or
reduced by taking a sample blank reading.
After the sample reading has been carried out, a special cell
(LCW919) with the sample blank is inserted in the cell
compartment. Measurement is automatic. The value of the
sample measurement is then corrected through addition or
subtraction of the blank value. The end result is shown in the
display with the blank value correction icon.
With some tests the determination of a sample blank value is not
necessary, as during the test procedure turbidities and coloring
are already recorded.
Note: To obtain further information on the Help Guide ("Information"
symbol), refer to