1.1 本规范包括通过显微镜检查测定丝状铁细菌(FIB)。本规范规定了在水和水形成的沉积物中发现的下列细菌属的鉴定: 西德罗卡普萨 , 加利亚内拉(Dioymohelix) , 球藻 , Crenothrix , 钩丝菌 ，和 克隆丝菌 . 1.2 以SI单位表示的值将被视为标准值。本标准不包括其他计量单位。 1.3 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。 1.4 本国际标准是根据关于制定国际标准、指南和建议的原则的决定i中确定的国际公认的标准化原则制定的由世界贸易组织技术性贸易壁垒（TBT）委员会发布。 ======意义和用途====== 5.1 丝状铁细菌是利用亚铁作为能量来源的微生物的一般分类，其特征在于氢氧化铁沉积在其粘液鞘中。随着这些生长，这个过程是连续的，经过一段时间，会出现大量粘稠的棕色沉积物。铁细菌可能会堵塞水管，减少传热，导致染色；细菌死亡后可能会产生令人讨厌的气味。水中的有机物因此增加，这反过来有利于其他细菌的繁殖。

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. ====== Significance And Use ====== 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.