Metrohm Inline-Ultrafiltration Bedienungsanleitung PDF herunterladen (Seite 25)

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4 Operation and maintenance

IC equipment: Inline-Ultrafiltration

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Table 1 Filtration of various samples

Sample designation Number of samples per filter

Orange juice with fruit pulp 40

Surface water 500

Drinking water 1,000

Ground water 500

Waste water 1 1,000

Waste water 2 130

Waste water 3 40

Waste water 4 80

NaCl solution (1%) 5,000

Schöniger absorption solution 100

Acidic earth extracts 1,000

Aqueous earth extracts 200

4.1.2 Selecting the filtration membrane

You can apply existing sample preparation procedures to the Metrohm

ultrafiltration cell (6.2729.110). If you wish to use a different filtration

membrane than the one supplied, please note that, even if the particle

size is known, selecting a membrane with a suitable pore size does not

automatically yield the desired results.

Our investigations have shown that the retention capacity of conventional

filtration membranes does not always correspond to their specified pore

size. The following table shows the qualitative filtration action of filtration

membranes with different nominal pore sizes. Aqueous solutions contain-

ing 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

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

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 2 ... 20 21 22 23 24 25 26 27 28 29 30 31

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