ASTM D1613-17(2023)

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: D1613 − 17 (Reapproved 2023)
Standard Test Method for
Acidity in Volatile Solvents and Chemical Intermediates
Used in Paint, Varnish, Lacquer, and Related Products
This standard is issued under the fixed designation D1613; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 2. Referenced Documents
1.1 This test method covers the determination of total 2.1 ASTM Standards:
acidity as acetic acid, in concentrations below 0.05 %, in D770 Specification for Isopropyl Alcohol
organic compounds and hydrocarbon mixtures used in paint, D1193 Specification for Reagent Water
varnish, and lacquer solvents and diluents. It is known to be D4806 Specification for Denatured Fuel Ethanol for Blend-
applicable to such mixtures as low molecular weight saturated ing with Gasolines for Use as Automotive Spark-Ignition
and unsaturated alcohols, ketones, ethers, esters, hydrocarbon Engine Fuel
diluents, naphtha, and other light distillate petroleum fractions. D7795 Test Method for Acidity in Ethanol and Ethanol
Blends by Titration
1.2 For purposes of determining conformance of an ob-
E29 Practice for Using Significant Digits in Test Data to
served value or a calculated value using this test method to
Determine Conformance with Specifications
relevant specifications, test result(s) shall be rounded off “to
E200 Practice for Preparation, Standardization, and Storage
the nearest unit” in the last right-hand digit used in expressing
of Standard and Reagent Solutions for Chemical Analysis
the specification limit, in accordance with the rounding-off
method of Practice E29.
3. Summary of Test Method
1.3 The values stated in SI units are to be regarded as the
3.1 The specimen is mixed with either an equal volume of
standard. The values given in parentheses are for information
water or an equal volume of alcohol, and titrated with aqueous
only.
sodium hydroxide solution to the phenolphthalein end point.
1.4 For specific hazard information and guidance consult
4. Significance and Use
supplier’s Safety Data Sheet.
4.1 This test method is useful for determining low levels of
1.5 This standard does not purport to address all of the
acidity, below 0.05 %, in organic compounds and hydrocarbon
safety concerns, if any, associated with its use. It is the
mixtures. The total acidity is calculated as acetic acid or
responsibility of the user of this standard to establish appro-
milligrams of sodium hydroxide per gram of sample.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
4.2 Acidity may be present as a result of contamination,
1.6 This international standard was developed in accor-
decomposition during storage or distribution, or manufacture.
dance with internationally recognized principles on standard-
This test method may be used in assessing compliance with a
ization established in the Decision on Principles for the
specification.
Development of International Standards, Guides and Recom-
5. Apparatus
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
5.1 Buret, 10 mL, graduated in 0.05 mL subdivisions.
5.2 Erlenmeyer Flask, 250 mL capacity.
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.35 on Solvents, Plasticizers, and Chemical Intermediates. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved July 1, 2023. Published August 2023. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1964. Last previous edition approved in 2017 as D1613 – 17. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D1613-17R23. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D1613 − 17 (2023)
acidity values. If the dissolved carbon dioxide is not removed from a
6. Purity of Reagents
sample, erroneously high results can be experienced which can exceed the
6.1 Reagent grade chemicals shall be used in all tests.
specification limit. It is recommended that Test Method D7795 be used for
Unless otherwise indicated, it is intended that all reagents shall
the determination of acidity in fuel ethanol and denatured fuel ethanol;
furthermore, as is codified in Specification D4806, Test Method D7795
conform to the specifications of the Committee on Analytical
should be considered the referee method:
Reagents of the American Chemical Society, where such
Section 8.4.1 from Specification D4806: “Dissolved carbon dioxide is
specifications are available. Other grades may be used pro-
a known interference and can cause a false high reading when using Test
vided it is first ascertained that the reagent is of sufficiently
Method D1613. In the absence of dissolved CO , Test Method D1613 is
high purity to permit its use without lessening the accuracy of an acceptable method. If a sample is known to have dissolved CO or if
dissolved CO can be present, Test Method D7795 is the preferred
the determination. 2
method. In cases of differing results between the two test methods, Test
6.2 Unless otherwise indicated, references to water shall be
Method D7795 shall be the referee method.”
understood to mean reagent water conforming to Type IV of
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