1、Designation:D5953M96(Reapproved 2009)Standard Test Method forDetermination of Non-Methane Organic Compounds(NMOC)in Ambient Air Using Cryogenic Preconcentration and DirectFlame Ionization Detection Method1This standard is issued under the fixed designation D5953M;the number immediately following the
2、 designation 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 method2covers a proced
3、ure for sampling anddetermining concentrations of non-methane organic com-pounds(NMOC)in ambient,indoor,or workplace atmo-spheres.1.2 The test method describes the collection of cumulativesamples in passivated stainless steel canisters and subsequentlaboratory analysis.1.2.1 This test method describ
4、es a procedure for sampling incanisters at final pressures above atmospheric pressure(re-ferred to as pressurized sampling).1.3 This test method employs a cryogenic trapping proce-dure for concentration of the NMOC prior to analysis.1.4 This test method describes the determination of theNMOC by the
5、simple flame ionization detector(FID),withoutthe gas chromatographic columns and complex proceduresnecessary for species separation.1.5 The range of this test method is from 20 to 10 000 ppbC(1,2).3See for procedures for lowering the range.1.6 The test method may yield less accurate results for some
6、halogenated or oxygenated hydrocarbons emitted from nearbysources of industrial air pollutants.This is especially true ifthere are high concentrations of chlorocarbons or chlorofluo-rocarbons present.1.7 The values stated in SI units are regarded as standard.1.8 This standard does not purport to add
7、ress 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.2.Referenced Documents2.1 ASTM Standards:4D1193 Specificati
8、on for Reagent WaterD1356 Terminology Relating to Sampling and Analysis ofAtmospheresD1357 Practice for Planning the Sampling of the AmbientAtmosphereD5466 Test Method for Determination of Volatile OrganicChemicals in Atmospheres(Canister Sampling Methodol-ogy)3.Terminology3.1 DefinitionsFor definit
9、ions of terms used in this testmethod,refer to Terminology D1356.3.2 Definitions of Terms Specific to This Standard:3.2.1 cryogena refrigerant used to obtain very low tem-peratures in the cryogenic traps of the analytical system.3.2.1.1 DiscussionLiquid argon(bp 185.7C at standardpressure)is recomme
10、nded for this test method.Cryogens withlower boiling points,such as liquid nitrogen,should not beused because of possible trapping of oxygen from the sampleair,which might lead to the possibility of an explosion or fire.In addition,methane would be trapped.3.2.2 dynamic calibrationcalibration of an
11、analytical sys-tem with pollutant concentrations that are generated in adynamic,flowing system,such as by quantitative,flow-ratedilution of a high-concentration gas standard with zero gas.3.2.3 NMOCnon-methane organic compounds.3.2.3.1 DiscussionTotal non-methane organic compounds1This is under the
12、jurisdiction of ASTM Committee D22 on Air Quality and isthe direct responsibility of Subcommittee D22.03 on Ambient Atmospheres andSource Emissions.Current edition approved Oct.1,2009.Published December 2009.Originallyapproved in 1996.Last previous edition approved in 2001 as D5953M-96(2001).DOI:10.
13、1520/D5953M-96R09.2This test method is based on EPA Method TO-12:“Determination of Non-Methane Organic Compounds(NMOC)in Ambient Air Using Cryogenic Pre-Concentration and Direct Flame Ionization Detection(PDFID)”,Compendium ofMethods for the Determination of Toxic Organic Compounds in Ambient Air,EP
14、A600 4-89-017,U.S.Environmental Protection Agency,Research Triangle Park,NC,March 1990.3The boldface numbers in parentheses refer to the list of references at the end ofthis standard.4For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org
15、.For Annual Book of ASTMStandards volume information,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 are those compounds measured by a flame ionization detector,excluding met
16、hane and compounds with vapor pressure above102kPa,recovered from the canister.3.2.4 ppm C and ppb Cconcentration units of parts permillion and parts per billion of organic carbon as detected bythe FID.3.2.4.1 DiscussionDuring calibration with propane,forexample,they are equivalent to parts per million by volume(ppm(v)or parts per billion by volume(ppb(v),respectively,multiplied by the number of carbon atoms in propane.4.Summary of Test Method(2-6)4.1 An air sample is extracted directly from the