1、Designation:D720311(Reapproved 2017)Standard Practice forScreening Trichloroethylene(TCE)-Contaminated MediaUsing a Heated Diode Sensor1This standard is issued under the fixed designation D7203;the number immediately following the designation indicates the year oforiginal adoption or,in the case of
2、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 practice describes procedures for screening mediaknown to contain the halogenated volatile organi
3、c compound(HVOC),trichloroethylene(TCE).Procedure A is to be usedfor screening soil known to contain TCE and Procedure B is tobe used for screening water known to contain TCE.1.1.1 Both Procedures A and B involve measuring the TCEconcentration in the headspace above a sample using a heateddiode sens
4、or device.From this measurement,an estimatedconcentration of TCE in the sample can be determined.AnyTCE remaining in the sample is not measured.Any otherHVOC present in the sample will be reported as TCE.1.2 Procedure A can also be used for screening the head-space above a soil suspected of containi
5、ng HVOC contamina-tion to indicate the presence or absence of HVOC contamina-tion in the soil.Procedure B can also be used for screening theheadspace above a water suspected of containing HVOCcontamination to indicate the presence or absence of HVOCcontamination in the water.For both procedures,any
6、HVOCcontamination remaining in the soil or water is not detected bythis practice.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3.1 ExceptionCertain inch-pound units are provided forinformation only.1.4 This standard does
7、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,health and environmental practices and deter-mine the applicability of regulatory limitations prior to use.NOTE1The diode sensor is he
8、ated to temperatures ranging betweenapproximately 600 and 1000 C(see 6.1.5)and as a result could be asource of ignition.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelop
9、ment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D4547 Guide for Sampling Waste and Soils for VolatileOrganic CompoundsD5681 Terminology for Waste and Waste Management
10、3.Terminology3.1 DefinitionsFor definitions of terms used in this screen-ing practice,refer to Terminology D5681.4.Summary of Practice4.1 Procedure ATo estimate the concentration of TCE in asoil known to contain TCE contamination,a sample of the soilis added to a glass jar having an open-top cap wit
11、h aPTFE-bonded silicone septum.At the time of screening,thetemperature of the soil in the jar should be approximately 50 to120 F(10 to 49 C).The soil in the jar is shaken and allowedto settle for 10 min,so the TCE can partition into the headspaceabove the soil.After 10 min,the TCE concentration in t
12、heheadspace is measured using a heated diode sensor device,which gives a numerical voltage reading.The voltage readingfrom the device is converted to a mg/m3value of TCE in theheadspace in the container.Using this value,an estimatedconcentration of TCE in the soil in mg/Kg can be calculated.Any TCE
13、remaining in the soil sample is not measured by thispractice.Any other HVOC present in the soil will be reportedas TCE.4.1.1 To use Procedure A to screen a soil suspected ofcontaining HVOC contamination,a sample of the soil is addedto a glass jar having an open-top cap with a PTFE-bondedsilicone sep
14、tum.At the time of screening,the temperature of1This practice is under the jurisdiction of ASTM Committee D34 on WasteManagement and is the direct responsibility of Subcommittee D34.01.05 onScreening Methods.Current edition approved Sept.1,2017.Published September 2017.Originallyapproved in 2005.Las
15、t previous edition approved in 2011 as D7203 11.DOI:10.1520/D7203-11R17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandardsvolume information,refer to the standards Document Summary page onthe ASTM web
16、site.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 the soil in the jar should be approximately 50 to 120 F(10 to49 C).The
