ASTM E2679-22

Standard Test Method for Acidity in Mono-, Di-, Tri- and Tetraethylene Glycol by <brk />Non-Aqueous Potentiometric Titration

SIGNIFICANCE AND USE
5.1 This test method provides for the quantitative determination of total acidity in ethylene glycols by non-aqueous potentiometric titration. The run time for titration of ethylene glycol samples ranges from 5 to 10 min with no sample preparation required. The length of time for a titration depends on the amount of acidity in the sample and the acidity generally increases from monoethylene glycol to the higher glycols like tetraethylene glycol.  
5.2 Acceptable levels of acidity in ethylene glycols vary with the manufacturer’s specifications but are normally below 200 mg/kg. Knowledge of the acidity in ethylene glycols is required to establish whether the product quality meets specification requirements.
SCOPE
1.1 This test method covers the determination of total acidity as acetic acid in commonly available grades of monoethylene glycol, diethylene glycol, triethylene glycol and tetraethylene glycol using a non-aqueous potentiometric titration. This test method is useful for determining low levels of acidity, below 200 mg/kg.  
1.2 The mono-, di-, tri- and tetraethylene glycols can be analyzed directly by this test method without any sample preparation.  
1.3 Review the current appropriate Safety Data Sheets (SDS) for detailed information concerning toxicity, first aid procedures, and safety precautions.  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.5 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 hazards statements are given in the section on Hazards, Section 9.  
1.6 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: 30-Jun-2022
• ICS: 71.080.60 - Alcohols. Ethers
• 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: E2679 − 22
Standard Test Method for
Acidity in Mono-, Di-, Tri- and Tetraethylene Glycol by
1
Non-Aqueous Potentiometric Titration
This standard is issued under the fixed designation E2679; 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* 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 This test method covers the determination of total
D1193Specification for Reagent Water
acidity as acetic acid in commonly available grades of mono-
D6809Guide for Quality Control and Quality Assurance
ethylene glycol, diethylene glycol, triethylene glycol and
Procedures for Aromatic Hydrocarbons and Related Ma-
tetraethylene glycol using a non-aqueous potentiometric titra-
terials
tion. This test method is useful for determining low levels of
E180Practice for Determining the Precision of ASTM
acidity, below 200 mg/kg.
Methods for Analysis and Testing of Industrial and Spe-
3
1.2 The mono-, di-, tri- and tetraethylene glycols can be
cialty Chemicals (Withdrawn 2009)
analyzed directly by this test method without any sample
3. Terminology
preparation.
3.1 Definitions:
1.3 Review the current appropriate Safety Data Sheets
3.1.1 acidity—the amount of total acid titrated with an
(SDS) for detailed information concerning toxicity, first aid
aqueous base (KOH or NaOH) in a sample of ethylene glycol.
procedures, and safety precautions.
The acidity is calculated as acetic acid in mg/kg.
1.4 The values stated in SI units are to be regarded as
4. Summary of Test Method
standard. No other units of measurement are included in this
standard. 4.1 An aliquot of a mono-, di-, tri- or tetraethylene glycol
sample is weighed and titrated potentiometrically with a
1.5 This standard does not purport to address all of the
monotonic or dynamic mode of titrant addition using an
safety concerns, if any, associated with its use. It is the
aqueous base (NaOH or KOH) solution to determine the acid
responsibility of the user of this standard to establish appro-
content in milligrams of acid as acetic acid per kilogram of
priate safety, health, and environmental practices and deter-
sample.Anethyleneglycolsamplecanbeanalyzeddirectlyby
mine the applicability of regulatory limitations prior to use.
this test method without any sample preparation using a
Specific hazards statements are given in the section on
combination pH electrode with an inert ethanol electrolyte
Hazards, Section 9.
designed for non-aqueous titrations. The potentiometric titra-
1.6 This international standard was developed in accor-
tion readings in millivolts are plotted automatically against the
dance with internationally recognized principles on standard-
respectivevolumesofthetitratingsolutionandtheendpointis
ization established in the Decision on Principles for the
identified by a well-defined inflection in the resulting curve.
Development of International Standards, Guides and Recom-
5. Significance and Use
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
5.1 This test method provides for the quantitative determi-
nation of total acidity in ethylene glycols by non-aqueous
potentiometric titration. The run time for titration of ethylene
glycol samples ranges from 5 to 10 min with no sample
preparationrequired.Thelengthoftimeforatitrationdepends
1 2
This test method is under the jurisdiction of ASTM Committee D16 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Aromatic, Industrial, Specialty and Related Chemicals and is the direct responsi- contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
bility of Subcommittee D16.14 on Alcohols & Glycols. Standards volume information, refer to the standard’s Document Summary page on
CurrenteditionapprovedJuly1,2022.PublishedJuly2022.Originallyapproved the ASTM website.
ɛ1 3
in 2009. Last previous edition approved in 2016 as E2679– 09 (2016) . DOI: The last approved version of this historical standard is referenced on
10.1520/E2679-22. 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

---------------------- Page: 1 ----------------------
E2679 − 22
ontheamountofacidityinthesampleandtheaciditygenerally betterresponsethanadualelectrodesystem.Theyshouldhave
increases from monoethylene glycol to the higher glycols like a movable sle
...

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.
´1
Designation: E2679 − 09 (Reapproved 2016) E2679 − 22
Standard Test Method for
Acidity in Mono-, Di-, Tri- and Tetraethylene Glycol by
1
Non-Aqueous Potentiometric Titration
This standard is issued under the fixed designation E2679; 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
ε NOTE—Minor editorial changes were made in February 2016.
1. Scope Scope*
1.1 This test method covers the determination of total acidity as acetic acid in commonly available grades of monoethylene glycol,
diethylene glycol, triethylene glycol and tetraethylene glycol using a non-aqueous potentiometric titration. This test method is
useful for determining low levels of acidity, below 200 mg/kg.
1.2 The mono-, di-, tri- and tetraethylene glycols can be analyzed directly by this test method without any sample preparation.
1.3 Review the current appropriate Safety Data Sheets (SDS) for detailed information concerning toxicity, first aid procedures, and
safety precautions.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 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 hazards statements are given in the section on Hazards, Section 9.
1.6 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
D6809 Guide for Quality Control and Quality Assurance Procedures for Aromatic Hydrocarbons and Related Materials
E180 Practice for Determining the Precision of ASTM Methods for Analysis and Testing of Industrial and Specialty Chemicals
3
(Withdrawn 2009)
3. Terminology
3.1 Definitions:
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, 2016July 1, 2022. Published February 2016July 2022. Originally approved in 2009. Last previous edition approved in 20092016 as
ɛ1
E2679 – 09. 09 (2016) . DOI: 10.1520/E2679-09R16E01.10.1520/E2679-22.
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

---------------------- Page: 1 ----------------------
E2679 − 22
3.1.1 acidity—the amount of total acid titrated with an aqueous base (KOH or NaOH) in a sample of ethylene glycol. The acidity
is calculated as acetic acid in mg/kg.
4. Summary of Test Method
4.1 An aliquot of a mono-, di-, tri- or tetraethylene glycol sample is weighed and titrated potentiometrically with a monotonic or
dynamic mode of titrant addition using an aqueous base (NaOH or KOH) solution to determine the acid content in milligrams of
acid as acetic acid per kilogram of sample. An ethylene glycol sample can be analyzed directly by this test method without any
sample preparation using a combination pH electrode with an inert ethanol electrolyte designed for non-aqueous titrations. The
potentiometric titration readings in millivolts are plotted automatically against the respective volumes of the titrating solution and
the end point is identified by a well-defined inflection in the resulting curve.
5. Significance and Use
5.1 This test method provides for the quantitative determination of total acidity in ethylene glycols by non-aqueous potentiometric
titration. The run time for titration of ethylene glyc
...