ASTM D6420-99(2004)
(Test Method)Standard Test Method for Determination of Gaseous Organic Compounds by Direct Interface Gas Chromatography-Mass Spectrometry
Standard Test Method for Determination of Gaseous Organic Compounds by Direct Interface Gas Chromatography-Mass Spectrometry
SIGNIFICANCE AND USE
This field test method determines the mass concentration of VOHAPs (or any subset) listed in Section 1.
Multiplying the mass concentration by the effluent volumetric flow rate (see 2.2) yields mass emission rates.
This field test method employs the typical laboratory GCMS techniques and QA/QC procedures.
This field test method provides data with accuracy and precision similar to most laboratory GCMS instrumentation.
Note 1—Supporting data are available from ASTM Headquarters Request RR:_______.
SCOPE
1.1 This test method employs a direct interface gas chromatograph/mass spectrometer (GCMS) to identify and quantify the 36 volatile organic compounds (or sub-set of these compounds) listed as follows. The individual Chemical Abstract Service (CAS) numbers are listed after each compound.
Benzene-71432Methylene chloride-75092Bromodichloromethane-752741,1,2,2-Tetrachloroethane-79349Carbon disulfide-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 acetate-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-78875Trichloroethene-79016Ethylbenzene-100414m-Xylene-108383Ethyl chloride-75003o-Xylene-95476
1.2 The test method incorporates a performance-based approach, which validates each GCMS analysis by placing boundaries on the instrument response to gaseous internal standards and their specific mass spectral relative abundance. Using this approach, the test method may be extended to analyze other compounds.
1.3 The test method provides on-site analysis of extracted, unconditioned, and unsaturated (at the instrument) gas samples from stationary sources. Gas streams with high moisture content may require conditioning to prevent moisture condensation within the instrument. For these samples, quality assurance (QA) requirements are provided in the test method to validate the analysis of polar, water-soluble compounds.
1.4 The instrument range should be sufficient to measure the listed volatile organic compounds from 150 ppb(v) to 100 ppm(v), using a full scan operation (between 45 and 300 atomic mass units). The range may be extended to higher or lower concentrations using either of the following procedures:
1.4.1 The initial three-point calibration concentrations and the continuing calibration checks are adjusted to match the stack concentrations, or
1.4.2 The three-point calibration is extended to include additional concentrations to cover the measurement range.
1.5 The minimum quantification level is 50 % of the lowest calibration concentration. Responses below this level are considered to be estimated concentrations, unless a calibration standard check is conducted at a lower concentration to demonstrate linearity. The sensitivity of the GCMS measurement system for the individual target analytes depends upon:
1.5.1 The specific instrument response for each target analyte and the number of mass spectral quantification ions available.
1.5.2 The amount of instrument noise, and
1.5.3 The percent moisture content of the sample gas.
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 applicability of regulatory limitations prior to use. Additional safety precautions are described in Section .
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D6420 – 99 (Reapproved 2004)
Standard Test Method for
Determination of Gaseous Organic Compounds by Direct
1
Interface Gas Chromatography-Mass Spectrometry
This standard is issued under the fixed designation D6420; 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.
1. Scope ppm(v), using a full scan operation (between 45 and 300
atomic mass units). The range may be extended to higher or
1.1 This test method employs a direct interface gas
lower concentrations using either of the following procedures:
chromatograph/mass spectrometer (GCMS) to identify and
1.4.1 The initial three-point calibration concentrations and
quantify the 36 volatile organic compounds (or sub-set of these
the continuing calibration checks are adjusted to match the
compounds) listed as follows. The individual Chemical Ab-
stack concentrations, or
stract Service (CAS) numbers are listed after each compound.
1.4.2 The three-point calibration is extended to include
Benzene-71432 Methylene chloride-75092
additional concentrations to cover the measurement range.
Bromodichloromethane-75274 1,1,2,2-Tetrachloroethane-79349
Carbon disulfide-75150 1,1,1-Trichloroethane-71556
1.5 The minimum quantification level is 50 % of the lowest
Chloroform-67663 1,1,2-Trichloroethane-79005
calibration concentration. Responses below this level are
Methyl iso-Butyl ketone-108101 p-Xylene-106423
considered to be estimated concentrations, unless a calibration
Styrene-100425 Bromomethane-74839
Tetrachloroethylene-127184 Carbon tetrachloride-56235
standard check is conducted at a lower concentration to
Toluene-108883 Chlorobenzene-108907
demonstrate linearity. The sensitivity of the GCMS measure-
Bromoform-75252 c-1,3-Dichloropropene-10061015
ment system for the individual target analytes depends upon:
Vinyl acetate-108054 1,2-Dichloroethane-156592
Vinyl chloride-75014 1,1-Dichloroethene-75354
1.5.1 The specific instrument response for each target ana-
Chloromethane-74873 t-1,2-Dichloroethene-156605
lyte and the number of mass spectral quantification ions
cis-1,2-Dichloroethene-156592 Methyl ethyl ketone-78933
Dibromochloromethane-124481 2-Hexanone-591786 available.
1,1-Dichloroethane-107062 t-1,3-Dichloropropene-542756
1.5.2 The amount of instrument noise, and
1,2-Dichloropropane-78875 Trichloroethene-79016
1.5.3 The percent moisture content of the sample gas.
Ethylbenzene-100414 m-Xylene-108383
Ethyl chloride-75003 o-Xylene-95476 1.6 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
1.2 The test method incorporates a performance-based ap-
responsibility of the user of this standard to establish appro-
proach, which validates each GCMS analysis by placing
priate safety and health practices and determine the applica-
boundaries on the instrument response to gaseous internal
bility of regulatory limitations prior to use. Additional safety
standards and their specific mass spectral relative abundance.
precautions are described in Section 9.
Using this approach, the test method may be extended to
analyze other compounds.
2. Referenced Documents
1.3 The test method provides on-site analysis of extracted,
2
2.1 ASTM Standards:
unconditioned, and unsaturated (at the instrument) gas samples
D1356 Terminology Relating to Sampling and Analysis of
from stationary sources. Gas streams with high moisture
Atmospheres
content may require conditioning to prevent moisture conden-
D3195 Practice for Rotameter Calibration
sation within the instrument. For these samples, quality assur-
2.2 EPA Test Methods:
ance (QA) requirements are provided in the test method to
Method 1–Sample and Velocity Traverses for Stationary
validate the analysis of polar, water-soluble compounds.
3
Sources
1.4 Theinstrumentrangeshouldbesufficienttomeasurethe
listed volatile organic compounds from 150 ppb(v) to 100
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
This test method is under the jurisdiction of ASTM Committee D22 on contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Sampling and Analysis of Atmospheres and is the direct responsibility of Subcom- Standards volume information, refer to the standard’s Document Summary page on
mittee D22.03 on Ambient Atmospheres and Source Emissions. the ASTM website.
3
CurrenteditionapprovedOctober1,2004.PublishedDecember2004.Originally Code of Federal Regulations 40 CFR Part 60, Appendix A, available from
approved in 1999. Last previous edition approved in 1999 as D6420 - 99. DOI: Superintendent of Documents, U.S. Government Printing Off
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