1、Designation:D575509(Reapproved 2014)1Standard Test Method forMicrovacuum Sampling and Indirect Analysis of Dust byTransmission Electron Microscopy for Asbestos StructureNumber Surface Loading1This standard is issued under the fixed designation D5755;the number immediately following the designation i
2、ndicates 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.1NOTEWarning notes were editorially updated throughout in
3、 April 2014.1.Scope1.1 This test method covers a procedure to(a)identifyasbestos in dust and(b)provide an estimate of the surfaceloading of asbestos in the sampled dust reported as the numberof asbestos structures per unit area of sampled surface.1.1.1 If an estimate of the asbestos mass is to be de
4、termined,the user is referred to Test Method D5756.1.2 This test method describes the equipment and proce-dures necessary for sampling,by a microvacuum technique,non-airborne dust for levels of asbestos structures.The non-airborne sample is collected inside a standard filter membranecassette from th
5、e sampling of a surface area for dust which maycontain asbestos.1.2.1 This procedure uses a microvacuuming sampling tech-nique.The collection efficiency of this technique is unknownand will vary among substrates.Properties influencing collec-tion efficiency include surface texture,adhesiveness,elect
6、ro-static properties and other factors.1.3 Asbestos identified by transmission electron microscopy(TEM)is based on morphology,selected area electron diffrac-tion(SAED),and energy dispersive X-ray analysis(EDXA).Some information about structure size is also determined.1.4 This test method is generall
7、y applicable for an estimateof the surface loading of asbestos structures starting fromapproximately 1000 asbestos structures per square centimetre.1.4.1 The procedure outlined in this test method employs anindirect sample preparation technique.It is intended to disperseaggregated asbestos into fund
8、amental fibrils,fiber bundles,clusters,or matrices that can be more accurately quantified bytransmission electron microscopy.However,as with all indi-rect sample preparation techniques,the asbestos observed forquantification may not represent the physical form of theasbestos as sampled.More specific
9、ally,the procedure de-scribed neither creates nor destroys asbestos,but it may alterthe physical form of the mineral fibers.1.5 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.6 This standard does not purport to address all of
10、 thesafety 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 Reag
11、ent WaterD3195 Practice for Rotameter CalibrationD3670 Guide for Determination of Precision and Bias ofMethods of Committee D22D5756 Test Method for Microvacuum Sampling and IndirectAnalysis of Dust by Transmission Electron Microscopyfor Asbestos Mass Surface LoadingD6620 Practice for Asbestos Detec
12、tion Limit Based onCountsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 Definitions:3.1.1 asbestiforma special type of fibrous habit in whichthe fibers are separ
13、able into thinner fibers and ultimately intofibrils.This habit accounts for greater flexibility and higher1This test method is under the jurisdiction of ASTM Committee D22 on AirQuality and is the direct responsibility of Subcommittee D22.07 on Sampling andAnalysis of Asbestos.Current edition approv
14、ed April 1,2014.Published May 2014.Originallyapproved in 1995.Last previous edition approved in 2009 as D5755 09.DOI:10.1520/D5755-09R14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume infor
15、mation,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 tensile strength than other habits of the same mineral.For moreinformation on asbestiform mineralogy,see Refs(1-3).33.1
16、.2 asbestosa collective term that describes a group ofnaturally occurring,inorganic,highly fibrous,silicate domi-nated minerals,which are easily separated into long,thin,flexible fibers when crushed or processed.3.1.2.1 DiscussionIncluded in the definition are the as-bestiform varieties of:serpentine(chrysotile);riebeckite(cro-cidolite);grunerite(grunerite asbestos);anthophyllite(an-thophyllite asbestos);tremolite(tremolite asbestos);andactinolite(actinolite asbestos).The amphibole mineral compo
