Document Center is acquired by Nimonik

Scope

1.1 This test method covers a procedure to test membrane filters for their ability to retain bacteria whose diameter is equal to or slightly larger than the 0.2-µm pore size of the membrane filter.

1.2 The procedures described are for the use of user laboratories as differentiated from manufacturers' laboratories.

1.3 This standard does not purport to address the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Significance and Use

Microbiological water testing procedures using membrane filtration are based on the premise that all bacteria within a specific size range will be retained by the membrane filter used. If the membrane filter does not retain these bacteria, false negative results or lowered density estimates may occur that could have serious repercussions due to the presence of unrecognized potential health hazards in the water being tested, especially in drinking water.

5.1.1 This procedure as devised will enable the user to test each membrane filter lot number for its ability to retain all bacterial equal to, or larger than, the stated membrane pore size.

Since this membrane is often used to sterilize nonautoclavable liquids, it is essential that the retention characteristics of this membrane are stable.

Keywords

filters; membrane; microbiological; retention; ICS Number Code 07.100.20 (Microbiology of water)

To find similar documents by ASTM Volume:

11.01 (Water (I))

11.02 (Water (II))

To find similar documents by classification:

07.100.20 (Microbiology of water Examination of biological properties of water, see 13.060.70)

This document comes with our free Notification Service, good for the life of the document.

This document is available in either Paper or PDF format.