Homogenization; Decomposition - wtw PhotoLab S12-A Operating Instructions Manual

photoLab ® Series
3 Sample Preparation
Procedure for microfiltration
Draw out the liquid
to be filtered with
the syringe.

3.5 Homogenization

3.6 Decomposition

12
Screw the syringe
tightly into the front
side of the mem -
brane-filter attach-
ment.
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 blen-
der (2 minutes at 5000 – 20 000 rpm and taking the sample while stirring.
Water-borne substances can be present in the sample for investigation in
Ion
a variety of forms: as the ion, bound more or less solidly in a complex, or
as a solid substance.
Complex
Solid
substance
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.
Release 01/2009