1、Designation:D6196151Standard Practice forChoosing Sorbents,Sampling Parameters and ThermalDesorption Analytical Conditions for Monitoring VolatileOrganic Chemicals in Air1This standard is issued under the fixed designation D6196;the number immediately following the designation indicates the year ofo
2、riginal 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.1NOTEEditorial corrections were made throughout in July 2018.1.Scope1.1 This p
3、ractice is intended to assist in the selection ofsorbents and procedures for the sampling and analysis ofambient(1),2indoor(2),and workplace(3,4)atmospheres fora variety of common volatile organic compounds(VOCs).Itmay also be used for measuring emissions from materials insmall or full scale environ
4、mental chambers or for humanexposure assessment.1.2 This practice is based on the sorption of VOCs from aironto selected sorbents or combinations of sorbents.Sampledair is either drawn through a tube containing one or a series ofsorbents(pumped sampling)or allowed to diffuse,undercontrolled conditio
5、ns,onto the sorbent surface at the samplingend of the tube(diffusive or passive sampling).The sorbedVOCs are subsequently recovered by thermal desorption andanalyzed by capillary gas chromatography.1.3 This practice applies to three basic types of samplersthat are compatible with thermal desorption:
6、(1)pumpedsorbent tubes containing one or more sorbents;(2)axialpassive(diffusive)samplers(typically of the same physicaldimensions as standard pumped sorbent tubes and containingonly one sorbent);and(3)radial passive(diffusive)samplers.1.4 This practice recommends a number of sorbents that canbe pac
7、ked in sorbent tubes for use in the sampling ofvapor-phase organic chemicals;including volatile and semi-volatile organic compounds which,generally speaking,boil inthe range 0 to 400C(v.p.15 to 0.01 kPa at 25C).1.5 This practice can be used for the measurement ofairborne vapors of these organic comp
8、ounds over a wideconcentration range.1.5.1 With pumped sampling,this practice can be used forthe speciated measurement of airborne vapors of VOCs in aconcentration range of approximately 0.1 g/m3to 1 g/m3,forindividual organic compounds in 110 L air samples.Quanti-tative measurements are possible wh
9、en using validated proce-dures with appropriate quality control measures.1.5.2 With axial diffusive sampling,this practice is valid forthe speciated measurement of airborne vapors of volatileorganic compounds in a concentration range of approximately100 g/m3to 100 mg/m3for individual organic compoun
10、ds foran exposure time of 8 h or 1 g/m3to 1 mg/m3for individualorganic compounds for an exposure time of four weeks.1.5.3 With radial diffusive sampling,this practice is validfor the measurement of airborne vapors of volatile organiccompounds in a concentration range of approximately 5 g/m3to 5 mg/m
11、3for individual organic compounds for exposuretimes of one to six hours.1.5.4 The upper limit of the useful range is almost alwaysset by the linear dynamic range of the gas chromatographcolumn and detector,or by the sample splitting capability ofthe analytical instrumentation used.1.5.5 The lower li
12、mit of the useful range depends on thenoise level of the detector and on blank levels of analyte orinterfering artifacts(or both)on the sorbent tubes.1.6 This procedure can be used for personal and fixedlocation sampling.It cannot be used to measure instantaneousor short-term fluctuations in concent
13、ration.Alternative grabsamplingprocedures using canister air samplers(for example,Test Method D5466)may be suitable for monitoring instanta-neous or short term fluctuations in air concentration.Alterna-tives for on-site measurement include,but are not limited to,gas chromatography,real-time mass spe
14、ctrometry detectorsand infrared spectrometry.1.7 The sampling method gives a time-weighted averageresult.1.8 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1This practice is under the jurisdiction ofASTM Committee D22 on Air Qua
15、lityand is the direct responsibility of Subcommittee D22.05 on Indoor Air.Current edition approved Nov.1,2015.Published February 2016.Originallyapproved in 1997.Last previous edition approved in 2009 as D6196 03(2009).DOI:10.1520/D6196-15E01.2The bold face numbers in parentheses refer to the list of
16、 references at the endof this practice.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally 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.1 1.9 This standard does not purport to