1、Designation:D642099(Reapproved 2010)Standard Test Method forDetermination of Gaseous Organic Compounds by DirectInterface Gas Chromatography-Mass Spectrometry1This standard is issued under the fixed designation D6420;the number immediately following the designation indicates the year oforiginal adop
2、tion 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 employs a direct interface gaschromatograph/mass spectrometer(
3、GCMS)to identify andquantify the 36 volatile organic compounds(or sub-set of thesecompounds)listed as follows.The individual Chemical Ab-stract Service(CAS)numbers are listed after each compound.Benzene-71432Methylene chloride-75092Bromodichloromethane-752741,1,2,2-Tetrachloroethane-79349Carbon disu
4、lfide-751501,1,1-Trichloroethane-71556Chloroform-676631,1,2-Trichloroethane-79005Methyl iso-Butyl ketone-108101p-Xylene-106423Styrene-100425Bromomethane-74839Tetrachloroethylene-127184Carbon tetrachloride-56235Toluene-108883Chlorobenzene-108907Bromoform-75252c-1,3-Dichloropropene-10061015Vinyl aceta
5、te-1080541,2-Dichloroethane-156592Vinyl chloride-750141,1-Dichloroethene-75354Chloromethane-74873t-1,2-Dichloroethene-156605cis-1,2-Dichloroethene-156592Methyl ethyl ketone-78933Dibromochloromethane-1244812-Hexanone-5917861,1-Dichloroethane-107062t-1,3-Dichloropropene-5427561,2-Dichloropropane-78875
6、Trichloroethene-79016Ethylbenzene-100414m-Xylene-108383Ethyl chloride-75003o-Xylene-954761.2 The test method incorporates a performance-basedapproach,which validates each GCMS analysis by placingboundaries on the instrument response to gaseous internalstandards and their specific mass spectral relat
7、ive abundance.Using this approach,the test method may be extended toanalyze other compounds.1.3 The test method provides on-site analysis of extracted,unconditioned,and unsaturated(at the instrument)gas samplesfrom stationary sources.Gas streams with high moisturecontent may require conditioning to
8、prevent moisture conden-sation within the instrument.For these samples,quality assur-ance(QA)requirements are provided in the test method tovalidate the analysis of polar,water-soluble compounds.1.4 The instrument range should be sufficient to measure thelisted volatile organic compounds from 150 pp
9、b(v)to 100ppm(v),using a full scan operation(between 45 and 300atomic mass units).The range may be extended to higher orlower concentrations using either of the following procedures:1.4.1 The initial three-point calibration concentrations andthe continuing calibration checks are adjusted to match th
10、estack concentrations,or1.4.2 The three-point calibration is extended to includeadditional concentrations to cover the measurement range.1.5 The minimum quantification level is 50%of the lowestcalibration concentration.Responses below this level areconsidered to be estimated concentrations,unless a
11、calibrationstandard check is conducted at a lower concentration todemonstrate linearity.The sensitivity of the GCMS measure-ment system for the individual target analytes depends upon:1.5.1 The specific instrument response for each target ana-lyte and the number of mass spectral quantification ionsa
12、vailable.1.5.2 The amount of instrument noise,and1.5.3 The percent moisture content of the sample gas.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 establish appro-priate safety and healt
13、h practices and determine the applica-bility of regulatory limitations prior to use.Additional safetyprecautions are described in Section 9.2.Referenced Documents2.1 ASTM Standards:2D1356 Terminology Relating to Sampling and Analysis ofAtmospheresD3195 Practice for Rotameter Calibration2.2 EPA Test
14、Methods:Method 1Sample and Velocity Traverses for StationarySources31This test method is under the jurisdiction of ASTM Committee D22 on AirQuality and is the direct responsibility of Subcommittee D22.03 on AmbientAtmospheres and Source Emissions.Current edition approved Oct.1,2010.Published Novembe
15、r 2010.Originallyapproved in 1999.Last previous edition approved in 2004 as D6420-99(2004).DOI:10.1520/D6420-99R10.2For 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 st
16、andards Document Summary page onthe ASTM website.3Code of Federal Regulations 40 CFR Part 60,Appendix A,available fromSuperintendent of Documents,U.S.Government Printing Office,Washington,DC20402.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 Method 2Determination of Stack Gas Velocity and Volu-metric Flow Rate(Type S Pitot Tube)3Method 3Gas Analysis for Carbon Dioxide,Oxygen,Ex-cess Air,and Dry Molecular Weight3Method 4Determination
