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ASTM D932-20

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Standard Practice for Filamentous Iron Bacteria in Water and Water-Formed Deposits

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1.1 This practice covers the determination of filamentous iron bacteria (FIB) by microscopic examination. This practice provides for the identification of the following genera of bacteria found in water and water-formed deposits: Siderocapsa, Gallionella (Dioymohelix), Sphaerotilus, Crenothrix, Leptothrix, and Clonothrix.

1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

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

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


5.1 Filamentous iron bacteria is a general classification for microorganisms that utilize ferrous iron as a source of energy and are characterized by the deposition of ferric hydroxide in their mucilaginous sheaths. The process is continuous with these growths, and over a period of time large accumulations of slimy brown deposits can occur. Iron bacteria may clog water lines, reduce heat transfer, and cause staining; objectionable odors may arise following death of the bacteria. The organic matter in the water is consequently increased, and this in turn favors the multiplication of other bacteria.

SDO ASTM: ASTM International
Document Number D932
Publication Date May 1, 2020
Language en - English
Page Count 11
Revision Level 20
Supercedes
Committee D19.24
Publish Date Document Id Type View
May 1, 2020 D0932-20 Revision
Feb. 1, 2015 D0932-15 Revision
Nov. 1, 2024 D0932-20R24 Reaffirmation
May 1, 2009 D0932-85R09 Reaffirmation
Dec. 10, 1997 D0932-85R97 Reaffirmation
Aug. 30, 1985 D0932-85R02 Reaffirmation