ASTM D2942-02(2023)
(Test Method)Standard Test Method for Total Acid Acceptance of Halogenated Organic Solvents (Nonreflux Methods)
Standard Test Method for Total Acid Acceptance of Halogenated Organic Solvents (Nonreflux Methods)
SIGNIFICANCE AND USE
4.1 Solvents that have been depleted in stabilizer content can become acidic. Acids can cause corrosion to process and storage equipment used for halogenated solvents.
4.2 Halogenated organic solvents may contain amine type (alkaline, aqueous extractable) acid accepting additives, neutral type (typically epoxide) acid accepting additives or both. This test method can determine the combined acid acceptance from both types of stabilizers. In addition, if the amine acid acceptance is determined by a separate procedure (see Test Methods D2106), the amount of neutral acid accepting stabilizers in a solvent can be calculated from the difference between combined and amine acid acceptance values.
4.3 This test method may be used by producers and users to verify that a product is complying with acid acceptance product specifications or by users to monitor the acid accepting ability of a solvent in use.
SCOPE
1.1 This test method covers the determination of the total acid acceptance including amine and neutral type (alpha epoxide) stabilizers in halogenated organic solvents.
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 precautionary statements are given in Section 7.
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
Relations
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: D2942 − 02 (Reapproved 2023)
Standard Test Method for
Total Acid Acceptance of Halogenated Organic Solvents
(Nonreflux Methods)
This standard is issued under the fixed designation D2942; 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 hydrochloric acid that has been dissolved in isopropyl alcohol.
The excess acid remaining after the reaction with the acid
1.1 This test method covers the determination of the total
acceptor is then back-titrated with a standardized solution of
acid acceptance including amine and neutral type (alpha
sodium hydroxide. The total acid acceptance of the stabilizers
epoxide) stabilizers in halogenated organic solvents.
can be calculated and reported as weight % NaOH.
1.2 The values stated in SI units are to be regarded as
3.2 Test Method B—The acid acceptor content is determined
standard. No other units of measurement are included in this
by gas chromatography or another validated method such as
standard.
density or refractive index and the acid acceptance is calculated
1.3 This standard does not purport to address all of the
from the weight % acid acceptor. Techniques like density and
safety concerns, if any, associated with its use. It is the
refractive index are generally suitable only for two-part sys-
responsibility of the user of this standard to establish appro-
tems. The method for the determination of the acid acceptor
priate safety, health, and environmental practices and deter-
should be validated for the sample being analyzed to ensure
mine the applicability of regulatory limitations prior to use.
there is no interference, particularly from such things as oils
Specific precautionary statements are given in Section 7.
and reaction products when measuring acid acceptance of
1.4 This international standard was developed in accor-
product that is in use such as vapor degreasers.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
4. Significance and Use
Development of International Standards, Guides and Recom-
4.1 Solvents that have been depleted in stabilizer content
mendations issued by the World Trade Organization Technical
can become acidic. Acids can cause corrosion to process and
Barriers to Trade (TBT) Committee.
storage equipment used for halogenated solvents.
2. Referenced Documents
4.2 Halogenated organic solvents may contain amine type
(alkaline, aqueous extractable) acid accepting additives, neutral
2.1 ASTM Standards:
D1193 Specification for Reagent Water type (typically epoxide) acid accepting additives or both. This
test method can determine the combined acid acceptance from
D2106 Test Methods for Determination of Amine Acid
Acceptance (Alkalinity) of Halogenated Organic Solvents both types of stabilizers. In addition, if the amine acid
acceptance is determined by a separate procedure (see Test
E200 Practice for Preparation, Standardization, and Storage
of Standard and Reagent Solutions for Chemical Analysis Methods D2106), the amount of neutral acid accepting stabi-
lizers in a solvent can be calculated from the difference
3. Summary of Test Method
between combined and amine acid acceptance values.
3.1 Test Method A—The total acid acceptance is determined
4.3 This test method may be used by producers and users to
by the reaction of the sample with a known amount of
verify that a product is complying with acid acceptance product
specifications or by users to monitor the acid accepting ability
of a solvent in use.
This test method is under the jurisdiction of ASTM Committee D26 on
Halogenated Organic Solvents and Fire Extinguishing Agents and is the direct
responsibility of Subcommittee D26.04 on Test Methods.
5. Test Method A
Current edition approved Aug. 1, 2023. Published August 2023. Originally
5.1 Apparatus:
approved in 1971. Last previous edition approved in 2018 as D2942 – 02 (2018).
DOI: 10.1520/D2942-02R23.
5.1.1 Iodine or Erlenmeyer Flasks, 250 mL, with ground-
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
glass stoppers.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.1.2 Burets, 25 mL or 50 mL, graduated to 0.1 mL.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 5.1.3 Pipet, 10 mL and 25 mL.
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D2942 − 02 (2023)
6. Reagents 8.3 If the amount of nonamine acid acceptance must be
known, first determine the amine acid acceptance in accor-
6.1 Purity of Reagents—Reagent grade chemicals shall be
dance with Test Methods D2106.
used in all tests. Unless otherwise indicated, it is intended that
all reagents shall conform to the specifications of the Commit-
9. Calculation
tee on Analytical Reagents of the American Chemical Society,
where such specifications are available. Other grades may be 9.1 Total Acid Acceptance—Calculate the total acid accep-
used, provided it is first ascertained that the reagent is of tance as equivalent NaOH in weight % as follows:
sufficiently high purity to permit its use without lessening the
Equivalent NaOH weight, % 5 A 2 B N × 0.04 × 100 /W (1)
@~ ! #
accuracy of the determina
...
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