ASTM D7200-12
用相位比对显微镜取样和计数车间内的空气纤维 (包含石棉纤维) 的标准实施规程
Standard Practice for Sampling and Counting Airborne Fibers, Including Asbestos Fibers, in Mines and Quarries, by Phase Contrast Microscopy and Transmission Electron Microscopy
ASTM D7200-12 发布历史
ASTM D7200-12由美国材料与试验协会 US-ASTM 发布于 2012。
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ASTM D7200-12 发布之时，引用了标准
- ASTM D1356 有关大气采样和分析的标准术语*， 2023-07-06 更新
- ASTM D1357 环境大气取样计划的标准实施规程
- ASTM D257 测验聚乙烯和聚丙烯膜湿润张力的试验方法
- ASTM D3670 D22委员会测定精确度和偏差方法的标准指南
- ASTM D5337 小型取样泵校正用流率的标准操作规程
- ASTM D6620 基于计数的石棉检测限的标准实施规程
- ISO 8672 空气质量 用相差光学显微镜法测定空气无机纤维浓度 滤膜法
* 在 ASTM D7200-12 发布之后有更新，请注意新发布标准的变化。
ASTM D7200-12的历代版本如下：
- 2012年 ASTM D7200-12 用相位比对显微镜取样和计数车间内的空气纤维 (包含石棉纤维) 的标准实施规程
- 2006年 ASTM D7200-06 用相位比对显微镜和相位传输显微镜取样和计数矿场和采石场内的空气纤维(包含石棉纤维)的标准实施规程
5. Significance and UseTop Bottom
5.1 Users of this practice must determine for themselves whether the practices described meet the requirements of local or national authorities regulating asbestos or other fibrous hazards.
5.2 Variations of this practice have been described by the Asbestos Research Council in Great Britain (8), the Asbestos International Association (AIA) (RTM 1) (9), NIOSH 7400, OSHA (Reference Method ID8201;160), and ISO8201;8672. Where the counting rules of these methods differ, this is noted in the text.
5.3 Advantages
5.3.1 The technique is specific for fibers. PCM is a fiber counting technique that excludes non-fibrous particles from the analysis.
5.3.2 The technique is inexpensive, but requires specialized knowledge to carry out the analysis for total fiber counts, at least in so far as the analyst is often required under regulations to have taken a specific training course (for example, NIOSH 582, or equivalent).
5.3.3 The analysis is quick and can be performed on-site for rapid determination of the concentrations of airborne fibers.
5.3.4 The procedure provides for a discriminate counting technique that can be used to estimate the percentage of counted fibers that may be asbestos.
5.4 Limitations
5.4.1 The main limitation of PCM is that fibers are not identified. All fibers within the specified dimensional range are counted. Differential fiber counting may sometimes be used to discriminate between asbestos fibers and fibers of obviously different morphology, such as cellulose and glass fiber. In most situations, differential fiber counting cannot be used to adequately differentiate asbestos from non-asbestos fibers for purposes of compliance with regulations without additional positive identification. If positive identification of asbestos is required, this must be performed by polarized light or electron microscopy techniques, using a different portion of the filter.
5.4.2 A further limitation is that the smallest fibers visible by PCM are about 0.2 ??m in diameter, while the finest asbestos fibers may be as small as 0.02 ??m in diameter.
5.4.3 Where calculation of fiber concentration provides a result exceeding the regulatory standard, non-compliance is assumed unless it can be proven that the fibers counted do not belong to a member or members of the group of fibers regulated by that standard.
- 标准号
- ASTM D7200-12
- 发布
- 2012年
- 发布单位
- 美国材料与试验协会
- 当前最新
- ASTM D7200-12
- 引用标准
- ASTM D1356 ASTM D1357 ASTM D257 ASTM D3670 ASTM D5337 ASTM D6620 ISO 8672