ASTM D2942-02

Standard Test Method for Total Acid Acceptance of Halogenated Organic Solvents (Nonreflux Methods)

SIGNIFICANCE AND USE
Solvents that have been depleted in stabilizer content can become acidic. Acids can cause corrosion to process and storage equipment used for halogenated solvents.
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 D 2106), the amount of neutral acid accepting stabilizers in a solvent can be calculated from the difference between combined and amine acid acceptance values.
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 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 and health practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Section 7.

General Information

• Status: Historical
• Publication Date: 09-Jun-2002
• ICS: 87.060.30 - Solvents
• Technical Committee: D26 - Halogenated Organic Solvents and Fire Extinguishing Agents
• Drafting Committee: D26.04 - Test Methods

Relations

• Replaced By: ASTM D2942-02(2008) - Standard Test Method for Total Acid Acceptance of Halogenated Organic Solvents (Nonreflux Methods)
• Effective Date: 01-Jan-2008
• Referred By: ASTM D4080-15(2020) - Standard Specification for Trichloroethylene, Technical and Vapor-Degreasing Grade
• Effective Date: 10-Jun-2002
• Referred By: ASTM D4376-15(2020) - Standard Specification for Vapor-Degreasing Grade Perchloroethylene
• Effective Date: 10-Jun-2002
• Referred By: ASTM D5616-04(2022) - Standard Specification for Reclaimed Trichloroethylene
• Effective Date: 10-Jun-2002
• Referred By: ASTM D6368-06(2023) - Standard Specification for Vapor-Degreasing Solvents Based on <emph type="bdit">normal</emph >-Propyl Bromide and Technical Grade <emph type="bdit">normal</emph >-Propyl Bromide
• Effective Date: 10-Jun-2002
• Referred By: ASTM D4081-16(2023) - Standard Specification for Drycleaning-Grade Perchloroethylene
• Effective Date: 10-Jun-2002
• Referred By: ASTM D4079-00(2022) - Standard Specification for Vapor-Degreasing Grade Methylene Chloride
• Effective Date: 10-Jun-2002
• Referred By: ASTM D3698-04(2020) - Standard Practice for Solvent Vapor Degreasing Operations
• Effective Date: 10-Jun-2002
• Referred By: ASTM D5396-04(2020) - Standard Specification for Reclaimed Perchloroethylene
• Effective Date: 10-Jun-2002
• Referred By: ASTM D4579-00(2023) - Standard Practice for Handling an Acid Degreaser or Still
• Effective Date: 10-Jun-2002

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D 2942 – 02
Standard Test Method for
Total Acid Acceptance of Halogenated Organic Solvents
1
(Nonreflux Methods)
This standard is issued under the fixed designation D 2942; 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 (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope from the weight % acid acceptor. Techniques like density and
refractive index are generally suitable only for two-part sys-
1.1 This test method covers the determination of the total
tems. The method for the determination of the acid acceptor
acid acceptance including amine and neutral type (alpha
should be validated for the sample being analyzed to ensure
epoxide) stabilizers in halogenated organic solvents.
there is no interference, particularly from such things as oils
1.2 This standard does not purport to address all of the
and reaction products when measuring acid acceptance of
safety concerns, if any, associated with its use. It is the
product that is in use such as vapor degreasers.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
4. Significance and Use
bility of regulatory limitations prior to use. Specific precau-
4.1 Solvents that have been depleted in stabilizer content
tionary statements are given in Section 7.
can become acidic. Acids can cause corrosion to process and
2. Referenced Documents storage equipment used for halogenated solvents.
4.2 Halogenated organic solvents may contain amine type
2.1 ASTM Standards:
2
(alkaline,aqueousextractable)acidacceptingadditives,neutral
D 1193 Specification for Reagent Water
type (typically epoxide) acid accepting additives or both. This
D 2106 Test Methods for the Determination ofAmineAcid
3
test method can determine the combined acid acceptance from
Acceptance(Alkalinity)ofHalogenatedOrganicSolvents
both types of stabilizers. In addition, if the amine acid
E 200 Practice for Preparation, Standardization, and Stor-
acceptance is determined by a separate procedure (see Test
age of Standard and Reagent Solutions for Chemical
3
Methods D 2106), the amount of neutral acid accepting stabi-
Analysis
lizers in a solvent can be calculated from the difference
3. Summary of Test Method
between combined and amine acid acceptance values.
4.3 This test method may be used by producers and users to
3.1 Test Method A—The total acid acceptance is determined
verifythataproductiscomplyingwithacidacceptanceproduct
by the reaction of the sample with a known amount of
specifications or by users to monitor the acid accepting ability
hydrochloric acid that has been dissolved in isopropyl alcohol.
of a solvent in use.
The excess acid remaining after the reaction with the acid
acceptor is then back-titrated with a standardized solution of
5. Test Method A
sodium hydroxide. The total acid acceptance of the stabilizers
5.1 Apparatus
can be calculated and reported as weight % NaOH.
5.1.1 Iodine or Erlenmeyer Flasks 250-mL, with ground-
3.2 TestMethodB—Theacidacceptorcontentisdetermined
glass stoppers.
by gas chromatography or another validated method such as
5.1.2 Burets, 25-mL or 50-mL, graduated to 0.1 mL.
densityorrefractiveindexandtheacidacceptanceiscalculated
5.1.3 Pipet, 10-mL and 25-mL.
1 6. Reagents
This test method is under the jurisdiction of ASTM Committee D26 on
Halogenated Organic Solvents and Fire Extinguishing Agents and is the direct
6.1 Purity of Reagents—Reagent grade chemicals shall be
responsibility of Subcommittee D26.04 on Test Methods.
used in all tests. Unless otherwise indicated, it is intended that
Current edition approved June 10, 2002. Published August 2002. Originally
all reagents shall conform to the specifications of the Commit-
published as D 2942 – 71 T. Last previous edition D 2942 – 96 (2000).
2
Annual Book of ASTM Standards, Vol 11.01.
tee onAnalytical Reagents of theAmerican Chemical Society,
3
Annual Book of ASTM Standards, Vol 15.05.
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1

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D2942–02
4
where such specifications are available. Other grades may be 9. Calculation
used, provided it is first ascertained that the reagent is of
9.1 Total Acid Acceptance—Calculate the total acid accep-
sufficiently high purity to permit its use without lessening the
tance as equivalent NaOH in weight % as follows:
accuracy of the determination.
Equivalent NaOH weight, % 5 A 2 B N3 0.04 3 100 /W (1)
@~ ! #
6.2 Purity of Water—Unless otherwis
...