14
Spectroquant
®
photometers
Release 06/2014
3 Sample Preparation
Draw out the liquid
to be filtered with
the syringe.
Screw the syringe
tightly into the front
side of the mem -
brane-filter attach-
ment.
Hold the syringe
upright and slowly
depress the piston
upwards until the
membrane- filter is
fully wetted free of
air bubbles.
Filter the contents
of the syringe into
the intended glass
vessel.
Procedure for microfiltration
As a measure to ensure that a representative sample can be taken in the
presence of suspended matter in the water sample in question, for certain
parameters - e. g. COD and the total content of heavy metals - the sample
must be homogenized. This must be carried out using a high-speed blend-
er (2 minutes at 5000 –20 000 rpm and taking the sample while stirring.
3.5 Homogenization
Water-borne substances can be present in the sample for investigation in
a variety of forms: as the ion, bound more or less solidly in a complex, or
as a solid substance.
3.6 Decomposition
Complex
Solid
substance
Ion
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