ASTM E1982-98

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Designation: E 1982 – 98
AMERICAN SOCIETY FOR TESTING AND MATERIALS
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Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Practice for
Open-Path Fourier Transform Infrared (OP/FT-IR) Monitoring
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of Gases and Vapors in Air
This standard is issued under the fixed designation E 1982; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope Compendium Method TO-16–Long-Path Open-Path Fou-
rier Transform Infrared Monitoring of Atmospheric
1.1 This practice covers procedures for using active open-
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Gases
path Fourier transform infrared (OP/FT-IR) monitors to mea-
sure the concentrations of gases and vapors in air. Procedures
3. Terminology
for choosing the instrumental parameters, initially operating
3.1 For definitions of terms used in this practice relating to
the instrument, addressing logistical concerns, making ancil-
general molecular spectroscopy, refer to Terminology E 131.
lary measurements, selecting the monitoring path, acquiring
3.2 For definitions of terms used in this practice relating to
data, analyzing the data, and performing quality control on the
OP/FT-IR monitoring, refer to Guide E 1865.
data are given. Because the logistics and data quality objectives
3.3 For definitions of general terms relating to optical
of each OP/FT-IR monitoring program will be unique, stan-
remote sensing, refer to the FT-IR Open Path Monitoring
dardized procedures for measuring the concentrations of spe-
Guidance Document.
cific gases are not explicitly set forth in this practice. Instead,
general procedures that are applicable to all IR-active gases
4. Significance and Use
and vapors are described. These procedures can be used to
4.1 An OP/FT-IR monitor can, in principle, measure the
develop standard operating procedures for specific OP/FT-IR
concentrations of all IR-active gases and vapors in the atmo-
monitoring applications.
sphere. Detailed descriptions of OP/FT-IR systems and the
1.2 This practice does not purport to address all of the
fundamental aspects of their operation are given in Guide
safety concerns, if any, associated with its use. It is the
E 1865 and the FT-IR Open-Path Monitoring Guidance Docu-
responsibility of the user of this practice to establish appro-
ment. A method for processing OP/FT-IR data to obtain the
priate safety and health practices and determine the applica-
concentrations of gases over a long, open path is given in
bility of regulatory limitations prior to use.
Compendium Method TO-16. Applications of OP/FT-IR sys-
2. Referenced Documents tems include monitoring for gases and vapors in ambient air,
along the perimeter of an industrial facility, at hazardous waste
2.1 ASTM Standards:
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sites and landfills, in response to accidental chemical spills or
E 131 Terminology Relating to Molecular Spectroscopy
releases, and in workplace environments.
E 168 Practices for General Techniques of Infrared Quanti-
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tative Analysis
5. Instrumental Parameters
E 1421 Practice for Describing and Measuring Performance
5.1 Several instrumental parameters must be chosen before
of Fourier Transform Infrared (FT-IR) Spectrometers:
data are collected with an OP/FT-IR system. These parameters
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Level Zero and Level One Tests
include the measurement time, spectral resolution, apodization
E 1655 Practices for Infrared, Multivariate, Quantitative
function, and zero filling factor. In some cases, the choice of
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Analysis
these parameters might be limited by the parameters used to
E 1865 Guide for Open-Path Fourier Transform Infrared
acquire and process the available reference spectra. Use the
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(OP/FT-IR) Monitoring of Gases and Vapors in Air
following procedures to select the instrumental parameters for
2.2 Other Documents:
each OP/FT-IR monitoring study.
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FT-1R Open-Path Monitoring Guidance Document
5.2 Measurement Time—Determine the measurement time
required to achieve the desired signal-to-noise ratio (S/N) at the
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selected resolution (see 5.3 and 6.7). Verify that this measure-
This practice is under the jurisdiction of ASTM Committee E-13 on Molecular
Spectroscopy and is the direct responsibility of Subcommittee E13.03 on Infrared ment time is appropriate for capturing the event being studied.
Spectroscopy.
Current edition approved October 10, 1998. Published March 1999.
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Annual Book of ASTM Standards, Vol 03.06. Compendium of Methods for the Determination of Toxic Organic Compounds
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EPA/600/R-96/040, National Technical Information Service Technology Ad- in Ambient Air, 2nd Ed., EPA/625/R-96/010b, Center for Environmental Re
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