1、Designation:D476621Standard Test Method forVinyl Chloride in Workplace Atmospheres(Charcoal TubeMethod)1This standard is issued under the fixed designation D4766;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revisi
2、on.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 describes the determination of vinylchloride monomer(VCM)in workplace atmospheres using amodified charcoal tube metho
3、d(see Practice D3686).1.2 This procedure is compatible with low-flow rate per-sonal sampling equipment.It can be used for personal orstationary monitoring.It cannot be used to determine instan-taneous fluctuations in concentration to detect maximum val-ues.Alternative on-site procedures,such as gas
4、chromatogra-phy or infrared spectrometry,are required to measure fast-changing concentrations.1.3 The range of this test method is from the limit ofquantitation approximately 0.03 to 100 ppm(v).1.4 The sampling method provides a time-weighted averagesample.1.5 The values stated in SI units are to be
5、 regarded asstandard.The values given in parentheses after SI units areprovided for information only and are not considered standard.1.6 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establis
6、h appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.For more specific precautionary statements,see Section 9,10.2.3,and 11.1.3.1.7 This international standard was developed in accor-dance with internationally recognized pri
7、nciples on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1356 Terminology Relating to Samp
8、ling and Analysis ofAtmospheresD3686 Practice for Sampling Atmospheres to Collect Or-ganic Compound Vapors(Activated Charcoal Tube Ad-sorption Method)E355 Practice for Gas Chromatography Terms and Relation-ships3.Terminology3.1 DefinitionsFor definitions of terms relating to this testmethod,refer to
9、 Terminology D1356 and Practice E355.4.Summary of Test Method4.1 Known volumes of sampled air are passed through glassor metal tubes packed with activated charcoal.Vinyl chloride isadsorbed on the charcoal and thus removed from the flowinggas stream(1-3).34.2 A two-section tube containing a front an
10、d a backupsection of adsorbent is used to collect the sample.4.3 The vinyl chloride is desorbed with carbon disulfide andanalyzed with a gas chromatograph equipped with a flameionization detector.Two or more different columns are to beused to reveal interferences that might otherwise not bedetected.
11、4.4 Adsorption/desorption efficiencies are determined bythe same techniques used for the atmospheric analysis appliedto known standards.Instrument calibrations are made withprepared standard solutions of vinyl chloride in carbon disul-fide.5.Significance and Use5.1 Vinyl chloride monomer(VCM)is the
12、starting materialfor the manufacture of poly(vinyl chloride)(PVC),which is1This test method is under the jurisdiction of ASTM Committee D22 on AirQuality and is the direct responsibility of Subcommittee D22.04 on Workplace AirQuality.Current edition approved March 1,2021.Published July 2021.Original
13、lyapproved in 1988.Last previous edition approved in 2014 as D4766 98(2014).DOI:10.1520/D4766-21.2For referenced ASTM 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 S
14、ummary page onthe ASTM website.3The boldface numbers in parentheses refer to a list of references at the end ofthis standard.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with intern
15、ationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1used extensively in construction,electronics,packagi
16、ng,andother industries.The vinyl chloride gas can escape duringmanufacturing,transportation,and polymerization stages.Re-sidual monomer can also escape during subsequent fabricationprocesses.5.2 Vinyl chloride is a toxic and explosive hazardousmaterial.5.3 Vinyl chloride is suspected to be a carcinogenic agent(4),and occupational exposure limits(OELs)have beenestablished for this agent.For instance,the present U.S.Occupational Safety and Health Administration(OSHA)per-missible exposure limit(PEL
