ASTM D2942-02(2013)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D2942 −02 (Reapproved 2013)
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 3.2 Test Method B—Theacidacceptorcontentisdetermined
by gas chromatography or another validated method such as
1.1 This test method covers the determination of the total
densityorrefractiveindexandtheacidacceptanceiscalculated
acid acceptance including amine and neutral type (alpha
from the weight % acid acceptor. Techniques like density and
epoxide) stabilizers in halogenated organic solvents.
refractive index are generally suitable only for two-part sys-
1.2 The values stated in SI units are to be regarded as
tems. The method for the determination of the acid acceptor
standard. No other units of measurement are included in this
should be validated for the sample being analyzed to ensure
standard.
there is no interference, particularly from such things as oils
1.3 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-
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
test method can determine the combined acid acceptance from
Acceptance (Alkalinity) of Halogenated Organic Solvents
both types of stabilizers. In addition, if the amine acid
E200Practice for Preparation, Standardization, and Storage
acceptance is determined by a separate procedure (see Test
of Standard and Reagent Solutions for ChemicalAnalysis
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 Thistestmethodmaybeusedbyproducersandusersto
by the reaction of the sample with a known amount of
verifythataproductiscomplyingwithacidacceptanceproduct
hydrochloric acid that has been dissolved in isopropyl alcohol.
specifications or by users to monitor the acid accepting ability
The excess acid remaining after the reaction with the acid
of a solvent in use.
acceptor is then back-titrated with a standardized solution of
5. Test Method A
sodium hydroxide. The total acid acceptance of the stabilizers
can be calculated and reported as weight % NaOH.
5.1 Apparatus
5.1.1 Iodine or Erlenmeyer Flasks 250-mL, with ground-
glass stoppers.
This test method is under the jurisdiction of ASTM Committee D26 on
5.1.2 Burets, 25-mL or 50-mL, graduated to 0.1 mL.
Halogenated Organic Solvents and Fire Extinguishing Agents and is the direct
5.1.3 Pipet, 10-mL and 25-mL.
responsibility of Subcommittee D26.04 on Test Methods.
Current edition approved Feb. 1, 2013. Published March 2013. Originally
6. Reagents
approved in 1971. Last previous edition approved in 2008 as D2942–02(2008).
DOI: 10.1520/D2942-02R13.
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 (2013)
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×specifi
...