ASTM E2193-23

Standard Test Method for Ultraviolet Transmittance of Monoethylene Glycol (using Ultraviolet Spectrophotometry)

SIGNIFICANCE AND USE
4.1 Knowledge of the UV transmittance of MEG is required to establish whether the product meets the requirements of its quality specifications.  
4.2 Dissolved oxygen in organic solvents, such as MEG, forms complexes that shift the solvent absorption from the vacuum UV range into the measurable UV range (near 190 nm to 250 nm). MEG has a UV absorption peak at 180 nm. For MEG-oxygen complexes, this peak is shifted to a longer wavelength, thus increasing the absorbability at 220 nm.  
4.2.1 However, this effect is not observed in water. There is no significant measurable effect due to dissolved oxygen in water that would require nitrogen sparging prior to using for collection of the reference spectrum.  
4.2.2 Nitrogen sparging and re-measurement of suspect or borderline glycol samples at 220 nm can be used as a tool to rule out or confirm the presence of UV affecting contaminants other than oxygen.
SCOPE
1.1 This test method covers a procedure for the determination of the transmittance of monoethylene glycol (1,2-ethanediol; MEG) at wavelengths in the region 220 nm to 350 nm. The results provide a measure of the purity of the sample with respect to ultraviolet (UV) absorbing compounds.  
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. For specific hazard statements, see Section 7.  
1.4 Review the current Safety Data Sheets (SDS) for detailed information concerning toxicity, first aid procedures, and safety precautions for all materials used in this test method.  
1.5 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-2023
• ICS: 71.040.50 - Physicochemical methods of analysis
• Technical Committee: D16 - Aromatic, Industrial, Specialty and Related Chemicals
• Drafting Committee: D16.14 - Alcohols & Glycols

Standards Content (Sample)

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: E2193 − 23
Standard Test Method for
Ultraviolet Transmittance of Monoethylene Glycol (using
1
Ultraviolet Spectrophotometry)
This standard is issued under the fixed designation E2193; 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* E169 Practices for General Techniques of Ultraviolet-Visible
Quantitative Analysis
1.1 This test method covers a procedure for the determina-
E180 Practice for Determining the Precision of ASTM
tion of the transmittance of monoethylene glycol (1,2-
Methods for Analysis and Testing of Industrial and Spe-
ethanediol; MEG) at wavelengths in the region 220 nm to
3
cialty Chemicals (Withdrawn 2009)
350 nm. The results provide a measure of the purity of the
E275 Practice for Describing and Measuring Performance of
sample with respect to ultraviolet (UV) absorbing compounds.
Ultraviolet and Visible Spectrophotometers
1.2 The values stated in SI units are to be regarded as
2.2 Other Document:
standard. No other units of measurement are included in this
Manufacturer’s Instruction Manual of Spectrophotometer
standard.
1.3 This standard does not purport to address all of the
3. Summary of Test Method
safety concerns, if any, associated with its use. It is the
3.1 The product is sampled in such a way as to avoid
responsibility of the user of this standard to establish appro-
extraneous contamination and air contact. The transmittance of
priate safety, health, and environmental practices and deter-
the sample contained in a 10 mm cell is measured against water
mine the applicability of regulatory limitations prior to use.
at a series of wavelengths.
For specific hazard statements, see Section 7.
3.2 This test method can be performed with two options as
1.4 Review the current Safety Data Sheets (SDS) for de-
to sample preparation prior to UV measurement.
tailed information concerning toxicity, first aid procedures, and
3.2.1 Option A: Nitrogen sparging of the sample (see 4.2).
safety precautions for all materials used in this test method.
3.2.2 Option B: No nitrogen sparging.
1.5 This international standard was developed in accor-
dance with internationally recognized principles on standard-
4. Significance and Use
ization established in the Decision on Principles for the
4.1 Knowledge of the UV transmittance of MEG is required
Development of International Standards, Guides and Recom-
to establish whether the product meets the requirements of its
mendations issued by the World Trade Organization Technical
quality specifications.
Barriers to Trade (TBT) Committee.
4.2 Dissolved oxygen in organic solvents, such as MEG,
2. Referenced Documents
forms complexes that shift the solvent absorption from the
2
vacuum UV range into the measurable UV range (near 190 nm
2.1 ASTM Standards:
D1193 Specification for Reagent Water to 250 nm). MEG has a UV absorption peak at 180 nm. For
MEG-oxygen complexes, this peak is shifted to a longer
D6809 Guide for Quality Control and Quality Assurance
Procedures for Aromatic Hydrocarbons and Related Ma- wavelength, thus increasing the absorbability at 220 nm.
4.2.1 However, this effect is not observed in water. There is
terials
no significant measurable effect due to dissolved oxygen in
E131 Terminology Relating to Molecular Spectroscopy
water that would require nitrogen sparging prior to using for
collection of the reference spectrum.
1
This test method is under the jurisdiction of ASTM Committee D16 on
4.2.2 Nitrogen sparging and re-measurement of suspect or
Aromatic, Industrial, Specialty and Related Chemicals and is the direct responsi-
borderline glycol samples at 220 nm can be used as a tool to
bility of Subcommittee D16.14 on Alcohols & Glycols.
Current edition approved April 1, 2023. Published April 2023. Originally
rule out or confirm the presence of UV affecting contaminants
approved in 2002. Last previous edition approved in 2016 as E2193 – 16. DOI:
other than oxygen.
10.1520/E2193-23.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. Un
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
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.
Designation: E2193 − 16 E2193 − 23
Standard Test Method for
Ultraviolet Transmittance of Monoethylene Glycol (using
1
Ultraviolet Spectrophotometry)
This standard is issued under the fixed designation E2193; 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*
1.1 This test method covers a procedure for the determination of the transmittance of monoethylene glycol (1,2-ethanediol; MEG)
at wavelengths in the region 220 to 350 nm. 220 nm to 350 nm. The results provide a measure of the purity of the sample with
respect to ultraviolet (UV) absorbing compounds.
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. For specific hazard statements, see Section 7.
1.4 Review the current Safety Data Sheets (SDS) for detailed information concerning toxicity, first aid procedures, and safety
precautions for all materials used in this test method.
1.5 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D1193 Specification for Reagent Water
D6299D6809 Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical
Measurement System PerformanceGuide for Quality Control and Quality Assurance Procedures for Aromatic Hydrocarbons
and Related Materials
E131 Terminology Relating to Molecular Spectroscopy
E169 Practices for General Techniques of Ultraviolet-Visible Quantitative Analysis
E180 Practice for Determining the Precision of ASTM Methods for Analysis and Testing of Industrial and Specialty Chemicals
3
(Withdrawn 2009)
E275 Practice for Describing and Measuring Performance of Ultraviolet and Visible Spectrophotometers
2.2 Other Document:
Manufacturer’s Instruction Manual of Spectrophotometer
1
This test method is under the jurisdiction of ASTM Committee D16 on Aromatic, Industrial, Specialty and Related Chemicals and is the direct responsibility of
Subcommittee D16.14 on Alcohols & Glycols.
Current edition approved Jan. 1, 2016April 1, 2023. Published January 2016April 2023. Originally approved in 2002. Last previous edition approved in 20082016 as
E2193 – 08.E2193 – 16. DOI: 10.1520/E2193-16.10.1520/E2193-23.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
The last approved version of this historical standard is referenced on www.astm.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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E2193 − 23
3. Summary of Test Method
3.1 The product is sampled in such a way as to avoid extraneous contamination and air contact. The absorbancetransmittance of
the sample contained in a 50-mm or 10-mm 10 mm cell is measured against water at a series of wavelengths and the transmittance
over a pathlength of 10 mm is calculated.wavelengths.
3.2 This test method can be performed with two options as to sample preparation prior to UV measurement.
3.2.1 Option A: Nitrogen sparging of the sample (see 4.2).
3.2.2 Option B: No nitrogen sparging.
4. Significance and Use
4.1 Knowledge of the ultravioletUV transmittance of monoethylene glycol MEG is required to establish whether the product meets
the requirements of its quality specifications.
4.2 Dissolved oxygen in organic solvents, such as MEG, forms complexes that shift the solvent absorption from the vacuum
ultravioletUV range into the measurable UV range (near 190 to 250 nm). Monoethylene glycol 190 nm t
...