ASTM D7203-11

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it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
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Designation:D7203–06
Standard Test Method for Designation: D7203 – 11
Standard Practice for
Screening Trichloroethylene (TCE)-Contaminated Media
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Using a Heated Diode Sensor
This standard is issued under the fixed designation D7203; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
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´ NOTE—Eq 24 was corrected editorially in March 2007.
1. Scope
1.1 This test methodpractice describes procedures for screening media known to contain the halogenated volatile organic
compound (HVOC), trichloroethylene (TCE). Procedure A is to be used for screening soil known to contain TCE and Procedure
B is to be used for screening water known to contain TCE.
1.1.1 Both ProceduresAand B involve measuring theTCE concentration in the headspace above a sample using a heated diode
sensor device. From this measurement, an estimated concentration of TCE in the sample can be determined.Any TCE remaining
in the sample is not measured. Any other HVOC present in the sample will be reported as TCE.
1.2 Procedure A can also be used for screening the headspace above a soil suspected of containing HVOC contamination to
indicate the presence or absence of HVOC contamination in the soil. Procedure B can also be used for screening the headspace
above a water suspected of containing HVOC contamination to indicate the presence or absence of HVOC contamination in the
water. For both procedures, any HVOC contamination remaining in the soil or water is not detected by this practice.
1.3 The values st mated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3.1 Exception—Certain inch-pound units are provided for information only.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the application of regulatory
limitations prior to use.
NOTE 1—The diode sensor is heated to temperatures ranging between approximately 600 and 1000 ºC (see 6.1.5) and as a result could be a source of
ignition.
2. Referenced Documents
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2.1 ASTM Standards:
D4547 Guide for Sampling Waste and Soils for Volatile Organic Compounds
D5681 Terminology for Waste and Waste Management
3. Terminology
3.1 DefinitionsDefinitions—For—For definitions of terms used in this screening test method,practice, refer to Terminology
D5681.
4. Summary of Test Method Summary of Practice
4.1 Procedure A—To estimate the concentration of TCE in a soil known to contain TCE contamination, a sample of the soil
is added to a glass jar having an open-top cap with a PTFE-bonded silicone septum. At the time of screening, the temperature of
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This test method practice is under the jurisdiction of ASTM Committee D34 on Waste Management and is the direct responsibility of Subcommittee D34.01.05 on
Screening Methods.
Current edition approved Oct. 1, 2006. Published November 2006. Originally approved in 2005. Last previous edition approved in 2005 as D7203-05. DOI:
10.1520/D7203-06E01.
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Current edition approved July 1, 2011. Published August 2011. Originally approved in 2005. Last previous edition approved in 2006 as D7203-06 . DOI:
10.1520/D7203-11.
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For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
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D7203 – 11
the soil in the jar should be approximately 50 to 120 ºF (10 to 49 ºC). The soil in the jar is shaken and allowed to settle for 10
min, so theTCE can partition into the headspace above the soil.After 10 min, theTCE concentration in the headspace is measured
using a heated diode sensor device, which gives a numerical voltage reading. The voltage reading from the device is converted
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to a mg/m value of TCE in the headspace in the container. Using this value, an estimated concentration of TCE in the soil in
mg/Kg can be calculated. Any TCE remaining in the soil sample is not measured by this test method.practice. Any other HVOC
present i
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