ASTM D6059-1996(2011) 5000 Standard Test Method for Determining Concentration of Airborne Single-Crystal Ceramic Whiskers in the Workplace Environment by Scanning Electron Microsco.pdf
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1、Designation: D6059 96 (Reapproved 2011)Standard Test Method forDetermining Concentration of Airborne Single-CrystalCeramic Whiskers in the Workplace Environment byScanning Electron Microscopy1This standard is issued under the fixed designation D6059; the number immediately following the designation
2、indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the sampling m
3、ethods andanalysis techniques used to assess the airborne concentrationand size distribution of single-crystal ceramic whiskers(SCCW), such as silicon carbide and silicon nitride, which mayoccur in and around the workplace where these materials aremanufactured, processed, transported, or used. This
4、testmethod is based on the collection of fibers by filtration of aknown quantity of air through a filter. The filter is subsequentlyevaluated with a scanning electron microscope (SEM) for thenumber of fibers meeting appropriately selected morphologicaland compositional criteria. This test method has
5、 the ability todistinguish among many different types of fibers based onenergy dispersive X-ray spectroscopy (EDS) analysis. This testmethod may be appropriate for other man-made mineral fibers(MMMF).1.2 This test method is applicable to the quantitation offibers on a collection filter that are grea
6、ter than 5 m in length,less than 3 m in width, and have an aspect ratio equal to orgreater than 5:1. The data are directly convertible to astatement of concentration per unit volume of air sampled. Thistest method is limited by the diameter of the fibers visible bySEM (typically greater than 0.10 to
7、 0.25 m in width asdetermined in 12.1.5) and the amount of coincident interfer-ence particles.1.3 A more definitive analysis may be necessary to confirmthe presence of fibers with diameters #0.10 to 0.25 m inwidth. For this purpose, a transmission electron microscope(TEM) is appropriate. The use of
8、the TEM method for theidentification and size measurement of SCCW is described inPractice D6058 and Test Method D6056.1.4 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.5 This standard does not purport to address all of thes
9、afety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reage
10、nt WaterD1356 Terminology Relating to Sampling and Analysis ofAtmospheresD4532 Test Method for Respirable Dust in WorkplaceAtmospheres Using Cyclone SamplersD6056 Test Method for Determining Concentration of Air-borne Single-Crystal Ceramic Whiskers in the WorkplaceEnvironment by Transmission Electr
11、on MicroscopyD6057 Test Method for Determining Concentration of Air-borne Single-Crystal Ceramic Whiskers in the WorkplaceEnvironment by Phase Contrast MicroscopyD6058 Practice for Determining Concentration of AirborneSingle-Crystal Ceramic Whiskers in the Workplace Envi-ronmentE691 Practice for Con
12、ducting an Interlaboratory Study toDetermine the Precision of a Test MethodE766 Practice for Calibrating the Magnification of a Scan-ning Electron Microscope3. Terminology3.1 Definitions:3.1.1 analytical sensitivity, nairborne fiber concentrationrepresented by a single fiber counted in the SEM.3.1.1
13、.1 DiscussionAlthough the terms fiber and whiskerare, for convenience, used interchangeably in this test method,whisker is correctly applied only to single-crystal fiberswhereas a “fiber” may be single- or poly-crystalline or may benoncrystalline.1This test method is under the jurisdiction of ASTM C
14、ommittee D22 on AirQuality and is the direct responsibility of Subcommittee D22.04 on Workplace AirQuality.Current edition approved Oct. 1, 2011. Published October 2011. Originallyapproved in 1996. Last previous edition approved in 2006 as D6059 - 96 (2006).DOI: 10.1520/D6059-96R11.2For referenced A
15、STM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Consho
16、hocken, PA 19428-2959, United States.3.1.2 aspect ratio, nthe ratio of the length of a fiber to itswidth.3.1.3 fiber, nfor the purpose of this test method,anelongated particle having a length greater than 5 m, a widthless than 3 m, and an aspect ratio equal to or greater than 5:1.3.1.4 fibrous, adjc
17、omposed of parallel, radiating, or inter-laced aggregates of fibers, from which the fibers are sometimesseparable. That is, the aggregate may be referred to as fibrouseven if it is not composed of separable fibers, but has thatdistinct appearance. The term fibrous is used in a generalmineralogical w
18、ay to describe aggregates.3.1.5 man-made mineral fiber, nany inorganic fibrousmaterial produced by chemical or physical processes.3.1.6 single-crystal ceramic whiskers, n a man-mademineral fiber that has a single-crystal structure.3.2 For definitions of other terms used in this test method,see Termi
19、nology D1356.4. Summary of Test Method4.1 The sample is collected on a mixed cellulose ester(MCE) filter by drawing air, using a sampling pump, throughan open-face 25-mm electrically conductive sampling cassetteassembly (1,2).3A section of the filter is transferred to an SEMstub and the fibers are i
20、dentified, sized, and counted at amagnification of 20003 in the SEM using the criteria dis-cussed in Section 11. Results are expressed as a fiber concen-tration per unit volume of air and a fiber loading per unit areaof filter. The airborne concentration is expressed as fiber permillilitre (f/mL) an
21、d fiber loading is expressed as fibers persquare millimetre (f/mm2).5. Significance and Use5.1 The SCCW may be present in the workplace atmospherewhere these materials are manufactured, processed, trans-ported, or used. This test method can be used to monitorairborne concentrations of SCCW fibers in
22、 these environments.It may be employed as part of a personal or area monitoringstrategy.5.2 This test method is based on morphology and elementalcomposition. The analysis technique has the ability to identifySCCW.NOTE 1This test method assumes that the analyst is familiar with theoperation of SEM/ED
23、S instrumentation and the interpretation of dataobtained using these techniques.5.3 This test method is not appropriate for measurement offibers with diameters #0.10 to 0.25 m due to visibilitylimitations associated with SEM. The TEM method may beused to provide additional size information of SCCW i
24、f needed(see Practice D6058 for additional information on the use ofthis test method).5.4 Results from the use of this test method shall be reportedalong with 95 % confidence limits for the samples beingstudied. Individual laboratories shall determine their intralabo-ratory coefficient of variation
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