Filtration unit and method for the microbiological analysis of liquid samples

摘要

The invention relates to a filtration unit, comprising a membrane filter that can be disposed on a filter support of a bottom part and an attachment that can be placed on the bottom part, wherein the membrane filter has a reinforcing edge, and wherein the membrane filter can be clamped to a clamping part of a cover of a culture medium unit for removal purposes and introduced into the culture media unit. The invention further relates to a method for the microbiological analysis of liquid samples following a filtration process, wherein after removing an attachment a membrane filter is lifted off a filter support for pouring in the liquid sample and set down on a surface of a culture medium disposed in the bottom part of a culture medium unit, and the bottom part is covered by a cover. The cover is placed on the membrane resting on the filter support such that a clamping part present on the filter support clamps to a reinforcing edge of the membrane. The cover is lifted off the filter support together with the membrane and placed on the bowl-shaped bottom part such that the bottom of the membrane facing away from the cover rests on the top of the nutrient medium facing the cover.

主权项

1. A filtration assembly for filtration and analysis of liquid samples, the filtration assembly comprising:
a filtration unit (1) having a lower part (3) with a filter support (5), a membrane filter (4) having an annular reinforcing edge (13), the membrane filter (4) being removably arranged on the filter support (5) of the lower part (3) and an attachment (2) removably placed in the lower part (3) for delivering a liquid sample to the membrane filter (4); and a nutrient medium unit (15) having a dish-shaped lower part (16, 16′) and a lid (20) selectively engageable with the dish-shaped lower part (16′) of the nutrient medium unit (15) when the attachment is removed from the filter support (5), the lid (20) having a clamping part (22) dimensioned for releasable engagement with the annular reinforcing edge (13) of the membrane filter (4) so that the membrane filter (4) can be removed from the filter support (5) of the lower part (3), and can be inserted into the dish-shaped lower part (16, 16′) of the nutrient medium unit (15).