1、Designation:D649499(Reapproved 2015)Standard Test Method forDetermination of Asphalt Fume Particulate Matter inWorkplace Atmospheres as Benzene Soluble Fraction1This standard is issued under the fixed designation D6494;the number immediately following the designation indicates the year oforiginal ad
2、option 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 determination of asphaltfume particulate matter(a
3、s benzene soluble fraction)and totalparticulate matter weight in workplace atmospheres using apolytetrafluoroethylene(PTFE)filter methodology.1.2 This procedure has been adapted from NIOSH Method5023(withdrawn prior to 4th edition(1994)and replaced in1998 with NIOSH Method 5042)and OSHA Method 58 to
4、reduce the level of background contamination providing betterreproducibility.1.3 This procedure is compatible with high flow rate per-sonal sampling equipment0.5 to 2.0 L/min.It can be used forpersonal or area monitoring.1.4 The sampling method develops a time-weighted average(TWA)sample and can be
5、used to determine short-termexposure limit(STEL).1.5 The applicable concentration range for the TWA sampleis from 0.2 to 2.0 mg/m3.1.6 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.7 This standard does not purport to address
6、all of 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.For more specificprecautionary statements,see Section 9.2.Refere
7、nced Documents2.1 ASTM Standards:2D1356 Terminology Relating to Sampling and Analysis ofAtmospheres2.2 Occupational Safety and Health Administration(OSHA)Methods:3OSHA Method 58 Coal Tar Pitch Volatiles2.3 National Institute for Occupational Safety and Health(NIOSH)Manual of Analytical Methods:4NIOS
8、H Method 5023 Coal Tar Pitch VolatilesNIOSH Method 5042 Benzene Soluble Fraction and TotalParticulate(Asphalt Fume)3.Terminology3.1 DefinitionsFor definitions of terms relating to this testmethod,refer to Terminology D1356.3.1.1 asphalt fume particulate matterparticulate mattergenerated during the p
9、rocessing of hot asphalt.4.Summary of Test Method4.1 A known volume of sample air is passed through aPTFE filter.Asphalt fumes are removed from the air stream bydeposition on the filter.4.2 The asphalt fume is extracted with a known volume ofbenzene.The benzene extract is then evaporated to dryness
10、ina vacuum oven.The benzene soluble fraction(BSF)is thendetermined gravimetrically.5.Significance and Use5.1 Asphalt is a material used in the construction of roadsand as a roofing material and sealant.5.2 This test method provides a means of evaluating expo-sure to asphalt fume in the working envir
11、onment at thepresently recommended exposure guidelines.5.2.1 The threshold limit value(TLV)for asphalt(petro-leum)fumes is 5 mg/m38-h TWA,(1998 Threshold LimitValues and Biological Exposure Indices,ACGIH5).1This test method is under the jurisdiction of ASTM Committee D22 on AirQuality and is the dir
12、ect responsibility of Committee D22.04 on Workplace AirQuality.Current edition approved Oct.1,2015.Published October 2015.Originallyapproved in 1999.Last previous edition approved in 2010 as D6494 99(2010).DOI:10.1520/D6494-99R15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orc
13、ontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from Occupational Safety and Health Administration(OSHA),200Constitution Ave.,NW,Washington,DC 20210,http:/www.osha.gov.4Avai
14、lable from National Institute for Occupational Safety and Health(NIOSH),Cincinnati,OH.http:/www.cdc.gov5Available from American Conference of Governmental Industrial Hygienists,Inc.(ACGIH),1330 Kemper Meadow Dr.,Cincinnati,OH 45240,http:/www.acgih.org.Copyright ASTM International,100 Barr Harbor Dri
15、ve,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.3 This procedure has been adapted from NIOSH Method5023(withdrawn prior to 4th edition(1994)and replaced in1998 with NIOSH Method 5042)and OSHA Method 58 toreduce the level of background contamination providing betterreproducibility.6.I
16、nterferences6.1 All materials(not just asphalt fume)collected that aresoluble in benzene will be included in the benzene solublefraction weight.6.2 Changes in temperature or humidity during pre-andpost-collection weighing may affect accuracy.7.Apparatus7.1 Sampling Apparatus:7.1.1 Filter Sampling CassetteA sampling cassette is atwo-piece opaque filter cassette containing a 37 mm pure PTFEfilter with 2 m pore size seated upon a 37 mm PTFE spacerring.PTFE filters should be preweighed(see 11.2.2)an
