Metrohm 6.02729.110, Руководство пользователя

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IC equipment: Inline Ultrafiltration 2 - push mode
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5 Operation
5.1 Ultrafiltration time and sample volume
The ultrafiltration cell was tested with the IC equipment: Inline Ultrafiltra-
tion 2 - push mode. The following values were determined for the ultrafil-
tration time and sample volume:
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Ultrafiltration time: 180 s
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Sample volume: 6.0 mL
These values are guidelines. The ultrafiltration time and the sample volume
of your installation may deviate from these values. This is why the actual
values for the ultrafiltration time and the sample volume must be deter-
mined for each installation.
5.2 Selecting the filtration membrane
Existing sample preparation procedures can be applied to ultrafiltration cell
2 (6.02729.110). If filtration membrane 1 (6.2714.020) is not used, a
membrane with suitable pore size does not automatically yield the desired
results even if the particle size is known.
Our investigations have shown that the retention capacity of conventional
filtration membranes does not always correspond to their specified pore
size. The table
Selection of the filtration membrane shows the qualitative
filtration action of filtration membranes with different nominal pore sizes.
Aqueous solutions containing silica particles with particle sizes of 1.5 µm
and 5 µm were used in the test.
Table 2 Selection of the filtration membrane
Test solutions: Silica
particles in water Pore size of the
filtration membrane
1
Effect
0.5%, 5 µm 0.15 µm no permeation
0.5%, 5 µm 3 µm no permeation
0.5%, 5 µm 8 µm no permeation
0.5%, 5 µm 10 µm permeation 2
0.5%, 5 µm 12 µm no permeation
0.5%, 1.5 µm 0.15 µm no permeation
0.5%, 1.5 µm 3 µm permeation
1 Nominal pore size according to manufacturer's statement.