ASTM D6348-03
(Test Method)Standard Test Method for Determination of Gaseous Compounds by Extractive Direct Interface Fourier Transform Infrared (FTIR) Spectroscopy
Standard Test Method for Determination of Gaseous Compounds by Extractive Direct Interface Fourier Transform Infrared (FTIR) Spectroscopy
SIGNIFICANCE AND USE
The FTIR measurements provide for multicomponent on-site analysis of source effluent.
This test method provides the volume concentration of detected analytes. Converting the volume concentration to a mass emission rate using a particular compound’molecular weight, and the effluent volumetric flow rate, temperature and pressure is useful for determining the impact of that compound to the atmosphere.
Known concentrations of target analytes are spiked into the effluent to evaluate the sampling and analytical system’effectiveness for transport and quantification of the target analytes, and to ensure that the data collected are meaningful.
The FTIR measurement data are used to evaluate process conditions, emissions control devices, and for determining compliance with emission standards or other applicable permits.
Data quality objectives for each specific testing program must be specified and outlined in a test plan (Annex A1). Supporting data are available from ASTM Headquarters Request RR: D22–1027.
SCOPE
1.1 This field test method employs an extractive sampling system to direct stationary source effluent to an FTIR spectrometer for the identification and quantification of gaseous compounds. This test method is potentially applicable for the determination of compounds that ( 1) have sufficient vapor pressure to be transported to the FTIR spectrometer and (2) absorb a sufficient amount of infrared radiation to be detected.
1.2 This field test method provides near real time analysis of extracted gas samples from stationary sources. Gas streams with high moisture content may require conditioning to minimize the excessive spectral absorption features imposed by water vapor.
1.3 This field test method requires the preparation of a source specific field test plan. The test plan must include the following: (1) the identification of the specific target analytes (2) the known analytical interferents specific to the test facility source effluent (3) the test data quality necessary to meet the specific test requirements and ( 4) the results obtained from the laboratory testing (see for test plan requirements).
1.4 The FTIR instrument range should be sufficient to measure from high ppm(v) to ppb(v) and may be extended to higher or lower concentrations using any or all of the following procedures:
1.4.1 The gas absorption cell path length may be either increased or decreased,
1.4.2 The sample conditioning system may be modified to reduce the water vapor, CO2, and other interfering compounds to levels that allow for quantification of the target compound(s), and
1.4.3 The analytical algorithm may be modified such that interfering absorbance bands are minimized or stronger/weaker absorbance bands are employed for the target analytes.
1.5 The practical minimum detectable concentration is instrument, compound, and interference specific (see Annex A2 for procedures to estimate the achievable minimum detectable concentrations (MDCs)). The actual sensitivity of the FTIR measurement system for the individual target analytes depends upon the following:
1.5.1 The specific infrared absorptivity (signal) and wavelength analysis region for each target analyte,
1.5.2 The amount of instrument noise (see Annex A6), and
1.5.3 The concentration of interfering compounds in the sample gas (in particular, percent moisture and CO2), and the amount of spectral overlap imparted by these compounds in the wavelength region(s) used for the quantification of the target analytes.
1.5.4 Any sampling system interferences such as adsorption or outgassing.
1.6 Practices E 168 and E 1252 are suggested for additional reading.
1.7 This standard does not purport to address all of the safety concerns associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to use. Additional safety pre...
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Designation: D6348 – 03
Standard Test Method for
Determination of Gaseous Compounds by Extractive Direct
1
Interface Fourier Transform Infrared (FTIR) Spectroscopy
This standard is issued under the fixed designation D6348; 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.
INTRODUCTION
ThisextractiveFTIRbasedfieldtestmethodisusedtoquantifygasphaseconcentrationsofmultiple
target analytes from stationary source effluent. Because an FTIR analyzer is potentially capable of
analyzing hundreds of compounds, this test method is not analyte or source specific. The analytes,
detection levels, and data quality objectives are expected to change for any particular testing situation.
Itistheresponsibilityofthetestertodefinethetargetanalytes,theassociateddetectionlimitsforthose
analytes in the particular source effluent, and the required data quality objectives for each specific test
program. Provisions are included in this test method that require the tester to determine critical
sampling system and instrument operational parameters, and for the conduct of QA/QC procedures.
Testers following this test method will generate data that will allow an independent observer to verify
the valid collection, identification, and quantification of the subject target analytes.
1. Scope 1.4.1 The gas absorption cell path length may be either
increased or decreased,
1.1 This field test method employs an extractive sampling
1.4.2 The sample conditioning system may be modified to
system to direct stationary source effluent to an FTIR spec-
reduce the water vapor, CO , and other interfering compounds
2
trometer for the identification and quantification of gaseous
to levels that allow for quantification of the target com-
compounds. This test method is potentially applicable for the
pound(s), and
determination of compounds that (1) have sufficient vapor
1.4.3 The analytical algorithm may be modified such that
pressure to be transported to the FTIR spectrometer and (2)
interferingabsorbancebandsareminimizedorstronger/weaker
absorb a sufficient amount of infrared radiation to be detected.
absorbance bands are employed for the target analytes.
1.2 Thisfieldtestmethodprovidesnearrealtimeanalysisof
1.5 The practical minimum detectable concentration is in-
extracted gas samples from stationary sources. Gas streams
strument, compound, and interference specific (see Annex A2
with high moisture content may require conditioning to mini-
for procedures to estimate the achievable minimum detectable
mize the excessive spectral absorption features imposed by
concentrations (MDCs)). The actual sensitivity of the FTIR
water vapor.
measurement system for the individual target analytes depends
1.3 This field test method requires the preparation of a
upon the following:
source specific field test plan. The test plan must include the
1.5.1 The specific infrared absorptivity (signal) and wave-
following: (1) the identification of the specific target analytes
length analysis region for each target analyte,
(2) the known analytical interferents specific to the test facility
1.5.2 The amount of instrument noise (see Annex A6), and
source effluent (3) the test data quality necessary to meet the
1.5.3 The concentration of interfering compounds in the
specific test requirements and (4) the results obtained from the
sample gas (in particular, percent moisture and CO ), and the
laboratory testing (see Annex A1 for test plan requirements). 2
amountofspectraloverlapimpartedbythesecompoundsinthe
1.4 The FTIR instrument range should be sufficient to
wavelength region(s) used for the quantification of the target
measure from high ppm(v) to ppb(v) and may be extended to
analytes.
higherorlowerconcentrationsusinganyorallofthefollowing
1.5.4 Any sampling system interferences such as adsorption
procedures:
or outgassing.
1.6 Practices E168 and E1252 are suggested for additional
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This test method is under the jurisdiction of Committee D22 on Sampling and
reading.
Analysis of Atmospheres and is the direct responsibility of Subcommittee D22.03
on Ambient Atmospheres and Source Emissions. 1.7 This standard does not purport to address all of the
CurrenteditionapprovedOctober1,2003.PublishedDecember2003.Originally
safety concerns associated with its use. It is the responsibility
approved in 1998. Last previous edition approved in 1998 as D6348 - 98. DOI:
of the user of this standard to establish appropriate safety and
10.1520/D6348-03.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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