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ASTM E1252-98(2021)

(Practice)

Standard Practice for General Techniques for Obtaining Infrared Spectra for Qualitative Analysis

Standard Practice for General Techniques for Obtaining Infrared Spectra for Qualitative Analysis

SIGNIFICANCE AND USE
4.1 Infrared spectroscopy is the most widely used technique for identifying organic and inorganic materials. This practice describes methods for the proper application of infrared spectroscopy.
SCOPE
1.1 This practice covers the spectral range from 4000 cm−1 to 50 cm−1 and includes techniques that are useful for qualitative analysis of liquid-, solid-, and vapor-phase samples by infrared spectrometric techniques for which the amount of sample available for analysis is not a limiting factor. These techniques are often also useful for recording spectra at frequencies higher than 4000 cm–1, in the near-infrared region.  
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific precautions are given in 6.5.1.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
31-Mar-2021
ICS
71.040.50 - Physicochemical methods of analysis
Technical Committee
E13 - Molecular Spectroscopy and Separation Science
Drafting Committee
E13.03 - Infrared and Near Infrared Spectroscopy
Current Stage
Ref Project

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ASTM E1252-98(2021) - Standard Practice for General Techniques for Obtaining Infrared Spectra for Qualitative AnalysisASTM E1252-98(2021) - Standard Practice for General Techniques for Obtaining Infrared Spectra for Qualitative Analysis
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ASTM E1252-98(2021) - Standard Practice for General Techniques for Obtaining Infrared Spectra for Qualitative Analysis
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: E1252 − 98 (Reapproved 2021)
Standard Practice for
General Techniques for Obtaining Infrared Spectra for
1
Qualitative Analysis
This standard is issued under the fixed designation E1252; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope E932PracticeforDescribingandMeasuringPerformanceof
−1 Dispersive Infrared Spectrometers
1.1 This practice covers the spectral range from 4000cm
−1 E1421Practice for Describing and Measuring Performance
to 50 cm and includes techniques that are useful for quali-
of Fourier Transform Mid-Infrared (FT-MIR) Spectrom-
tative analysis of liquid-, solid-, and vapor-phase samples by
eters: Level Zero and Level One Tests
infrared spectrometric techniques for which the amount of
E1642Practice for General Techniques of Gas Chromatog-
sample available for analysis is not a limiting factor. These
raphy Infrared (GC/IR) Analysis
techniques are often also useful for recording spectra at
–1
frequencieshigherthan4000cm ,inthenear-infraredregion.
3. Terminology
1.2 The values stated in SI units are to be regarded as
3.1 Definitions—Fordefinitionsoftermsandsymbols,refer
standard. No other units of measurement are included in this
to Terminology E131.
standard.
4. Significance and Use
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4.1 Infraredspectroscopyisthemostwidelyusedtechnique
responsibility of the user of this standard to establish appro-
for identifying organic and inorganic materials. This practice
priate safety, health, and environmental practices and deter-
describes methods for the proper application of infrared
mine the applicability of regulatory limitations prior to use.
spectroscopy.
Specific precautions are given in 6.5.1.
1.4 This international standard was developed in accor- 5. General
dance with internationally recognized principles on standard-
5.1 Infrared (IR) qualitative analysis is carried out by
ization established in the Decision on Principles for the 3
functional group identification (1-3) or by the comparison of
Development of International Standards, Guides and Recom-
IR absorption spectra of unknown materials with those of
mendations issued by the World Trade Organization Technical
known reference materials, or both.These spectra are obtained
Barriers to Trade (TBT) Committee.
(4-8) through transmission, reflection, and other techniques,
such as photoacoustic spectroscopy (PAS). Spectra that are to
2. Referenced Documents
be compared should be obtained by the same technique and
2
2.1 ASTM Standards:
under the same conditions. Users of published reference
E131Terminology Relating to Molecular Spectroscopy
spectra (9-16) should be aware that not all of these spectra are
E168Practices for General Techniques of Infrared Quanti-
fully validated.
tative Analysis
5.1.1 Instrumentation and accessories for infrared qualita-
E334Practice for General Techniques of Infrared Micro-
tive analysis are commercially available. The manufacturer’s
analysis
manual should be followed to ensure optimum performance
E573Practices for Internal Reflection Spectroscopy
and safety.
5.2 Transmission spectra are obtained by placing a thin
uniform layer of the sample perpendicular to the infrared
1
This practice is under the jurisdiction ofASTM Committee E13 on Molecular
Spectroscopy and Separation Science and is the direct responsibility of Subcom- radiation path (see 9.5.1 for exception in order to eliminate
mittee E13.03 on Infrared and Near Infrared Spectroscopy.
interference fringes for thin films). The sample thickness must
Current edition approved April 1, 2021. Published April 2021. Originally
be adequate to cause a decrease in the radiant power reaching
ɛ1
approved in 1988. Last previous edition approved in 2013 as E1252–98(2013) .
the detector at the absorption frequencies used in the analysis.
DOI: 10.1520/E1252-98R21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on The boldface numbers in parentheses refer to a list of references at the end of
the ASTM website. this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E1252 − 98 (20
...

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4.1 If ASTM Committee E13 has not specified an appropriate test procedure for a specific type of spectrophotometer, or if the sample specified by a Committee E13 procedure is incompatible with the intended spectrophotometer operation, then this guide can be used to develop practical performance tests.  
4.1.1 For spectrophotometers which are equipped with permanent or semi-permanent sampling accessories, the test sample specified in a Committee E13 practice may not be compatible with the spectrophotometer configuration. For example, for FT-MIR instruments equipped with transmittance or IRS flow cells, tests based on polystyrene films are impractical. In such cases, these guidelines suggest means by which the recommended test procedures can be modified so as to be performed on a compatible test material.  
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1.1 This guide covers basic procedures that can be used to develop spectrophotometer performance tests. The guide is intended to be applicable to spectrophotometers operating in the ultraviolet, visible, near-infrared and mid-infrared regions.  
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