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ASTM D6281-2006 用透射式电子显微镜直接转移法测定周围环境和室内空气中气载石棉浓度的标准试验方法
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【英文标准名称】: Standard Test Method for Airborne Asbestos Concentration in Ambient and Indoor Atmospheres as Determined by Transmission Electron Microscopy Direct Transfer (TEM)
【原文标准名称】: 用透射式电子显微镜直接转移法测定周围环境和室内空气中气载石棉浓度的标准试验方法
【标准号】: ASTM D6281-2006
【标准状态】: 现行
【国别】:
【发布日期】: 2006
【实施或试行日期】:
【发布单位】: 美国材料与试验协会(US-ASTM)
【起草单位】: D22.07
【标准类型】: (Test Method)
【标准水平】: ()
【中文主题词】: 空气;空气质量;环境空气;角闪石;石棉;石棉粉;温石棉;电子显微镜;电子显微镜检查法;显微术;试验
【英文主题词】: air; ambient air; amphibole; asbestos; chrysotile; electron microscopy; indoor atmospheres; microscopy
【摘要】: 1.1 This test method is an analytical procedure using transmission electron microscopy (TEM) for the determination of the concentration of asbestos structures in ambient atmospheres and includes measurement of the dimension of structures and of the asbestos fibers found in the structures from which aspect ratios are calculated.1.1.1 This test method allows determination of the type(s) of asbestos fibers present.1.1.2 This test method cannot always discriminate between individual fibers of the asbestos and non-asbestos analogues of the same amphibole mineral.1.2 This test method is suitable for determination of asbestos in both ambient (outdoor) and building atmospheres.1.2.1 This test method is defined for polycarbonate capillary-pore filters or cellulose ester (either mixed esters of cellulose or cellulose nitrate) filters through which a known volume of air has been drawn and for blank filters.1.3 The upper range of concentrations that can be determined by this test method is 7000 s/mm2. The air concentration represented by this value is a function of the volume of air sampled.1.3.1 There is no lower limit to the dimensions of asbestos fibers that can be detected. In practice, microscopists vary in their ability to detect very small asbestos fibers. Therefore, a minimum length of 0.5 m has been defined as the shortest fiber to be incorporated in the reported results.1.4 The direct analytical method cannot be used if the general particulate matter loading of the sample collection filter as analyzed exceeds approximately 10 % coverage of the collection filter by particulate matter.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 and health practices and determine the applicability of regulatory limitations prior to use.
【中国标准分类号】: Z15
【国际标准分类号】: 13_040_01
【页数】: 32P.;A4
【正文语种】:

关键字: ASTM D628

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