ASTM D2942-02(2008)
(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
p>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.
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Designation:D2942 −02(Reapproved 2008)
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.Anumber 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 Department of Defense.
1. Scope refractive index are generally suitable only for two-part sys-
tems. The method for the determination of the acid acceptor
1.1 This test method covers the determination of the total
should be validated for the sample being analyzed to ensure
acid acceptance including amine and neutral type (alpha
there is no interference, particularly from such things as oils
epoxide) stabilizers in halogenated organic solvents.
and reaction products when measuring acid acceptance of
1.2 This standard does not purport to address all of the
product that is in use such as vapor degreasers.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Significance and Use
priate safety and health practices and determine the applica-
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
storage equipment used for halogenated solvents.
2. Referenced Documents
4.2 Halogenated organic solvents may contain amine type
2.1 ASTM Standards:
(alkaline,aqueousextractable)acidacceptingadditives,neutral
D1193Specification for Reagent Water
type (typically epoxide) acid accepting additives or both. This
D2106Test Methods for Determination of Amine Acid
Acceptance (Alkalinity) of Halogenated Organic Solvents test method can determine the combined acid acceptance from
E200Practice for Preparation, Standardization, and Storage both types of stabilizers. In addition, if the amine acid
of Standard and Reagent Solutions for ChemicalAnalysis acceptance is determined by a separate procedure (see Test
Methods D2106), the amount of neutral acid accepting stabi-
3. Summary of Test Method
lizers in a solvent can be calculated from the difference
3.1 Test Method A—The total acid acceptance is determined
between combined and amine acid acceptance values.
by the reaction of the sample with a known amount of
4.3 This test method may be used by producers and users to
hydrochloric acid that has been dissolved in isopropyl alcohol.
verifythataproductiscomplyingwithacidacceptanceproduct
The excess acid remaining after the reaction with the acid
specifications or by users to monitor the acid accepting ability
acceptor is then back-titrated with a standardized solution of
of a solvent in use.
sodium hydroxide. The total acid acceptance of the stabilizers
can be calculated and reported as weight % NaOH.
5. Test Method A
3.2 Test Method B—Theacidacceptorcontentisdetermined
by gas chromatography or another validated method such as
5.1 Apparatus
densityorrefractiveindexandtheacidacceptanceiscalculated
5.1.1 Iodine or Erlenmeyer Flasks 250-mL, with ground-
from the weight % acid acceptor. Techniques like density and
glass stoppers.
5.1.2 Burets, 25-mL or 50-mL, graduated to 0.1 mL.
This test method is under the jurisdiction of ASTM Committee D26 on
5.1.3 Pipet, 10-mL and 25-mL.
Halogenated Organic Solvents and Fire Extinguishing Agents and is the direct
responsibility of Subcommittee D26.04 on Test Methods.
Current edition approved Jan. 1, 2008. Published March 2008. Originally
6. Reagents
approved in 1971. Last previous edition approved in 2002 as D2942–02. DOI:
10.1520/D2942-02R08.
6.1 Purity of Reagents—Reagent grade chemicals shall be
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
used in all tests. Unless otherwise indicated, it is intended that
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
all reagents shall conform to the specifications of the Commit-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. tee onAnalytical Reagents of theAmerican Chemical Society,
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D2942−02 (2008)
where such specifications are available. Other grades may be EquivalentNaOHweight, % 5 A 2 B N 30.04 3100 /W (1)
@~ ! #
used, provided it is first ascertained that the reagent is of
where:
sufficiently high purity to permit its use without lessening the
A = NaOH solution required for blank titration (8.1), mL,
accuracy of the determination.
6.2 Purity of Water—Unless otherwise indicated, references
B = NaOH solution required for sample titration (8.2),
towatershallbeunderstoodtomeanreagentwaterconforming
mL,
to Specification D1193.
N = Normality of NaOH solution,
0.04 = GequivalentNaOHpermLof1normalsolution,and
6.3 Bromophenol Blue Indicator Solution (1.0 g/L)—
W = sample used (volume in mL×specific gravity), g.
Preparedbydissolving1.0gofbromophenolblueinamix
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:D2942–96 (Reapproved 2000) Designation: D 2942 – 02 (Reapproved 2008)
Standard Test Method for
Total Acid Acceptance of Halogenated Organic Solvents
(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
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.
2. Referenced Documents
2.1 ASTM Standards:
D 1193 Specification for Reagent Water
D 2106 Test Methods for the Determination of Amine Acid Acceptance (Alkalinity) of Halogenated Organic Solvents
E 200 Practice for Preparation, Standardization, and Storage of Standard and Reagent Solutions for Chemical Analysis
3. Summary of Test Method
3.1Thetotalacidacceptanceisdeterminedbythereactionofthesamplewithaknownamountofhydrochloricacidthathasbeen
dissolved in isopropyl alcohol. The excess acid remaining after the reaction with the acid acceptor stabilizes is then back-titrated
with a standardized solution of sodium hydroxide. The total acid acceptance of the stabilizers can be calculated and reported as
weight % NaOH.
3.1 TestMethodA—Thetotalacidacceptanceisdeterminedbythereactionofthesamplewithaknownamountofhydrochloric
acid that has been dissolved in isopropyl alcohol. The excess acid remaining after the reaction with the acid acceptor is then
back-titrated with a standardized solution of sodium hydroxide. The total acid acceptance of the stabilizers can be calculated and
reported as weight % NaOH.
3.2 Test Method B—The acid acceptor content is determined by gas chromatography or another validated method such as
density or refractive index and the acid acceptance is calculated from the weight % acid acceptor. Techniques like density and
refractive index are generally suitable only for two-part systems. The method for the determination of the acid acceptor should be
validated for the sample being analyzed to ensure there is no interference, particularly from such things as oils and reaction
products when measuring acid acceptance of product that is in use such as vapor degreasers.
4. 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(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.
4.3 This test method may be used by producers and users to verify that a product is complying with acid acceptance product
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.
Current edition approved Dec. 10, 1996. Published June 1997. Originally published as D2942–71T. Last previous edition D2942–92.
Current edition approved Jan. 1, 2008. Published March 2008. Originally approved in 1971. Last previous edition approved in 2002 as D 2942 – 02.
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. ForAnnualBookofASTMStandards
, Vol 11.01.volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 2942 – 02 (2008)
specifications or by users to monitor the acid accepting ability of a solvent in use.
5. Apparatus Test Method A
5.1 Iodine or Erlenmeyer FlasksApparatus
5.1.1 Iodine or Erlenmeyer Flasks 250-mL, with ground-glass stoppers.
5.2
5.1.2 Burets, 25-mL or 50-mL, graduated to 0.1 mL.
5.3
5.1.3 Pipet, 10-mL and 25-mL.
6. Reagents
6.1 Purity of Reagents—Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that all
reagents shall conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society, where
such specifications are available. Other grades may be used, provided it is first ascertained that the reagent is of sufficiently high
purity to permit its use without lessening the accuracy of the determination.
6.2 Purity of Water— Unless otherwise indicated, references to water shall be understood to mean reagent water conforming
to Specification D 1193.
6.3 Bromophenol Blue Indic
...
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