ASTM D2930-03

Standard Test Method for Maleic Acid in Maleic Anhydride by Potentiometric Titration (Withdrawn 2012)

SIGNIFICANCE AND USE
The maleic acid content is usually an indication of exposure to moisture in air. Maleic anhydride reacts with moisture to form maleic acid.
SCOPE
1.1 This test method covers the determination of free maleic acid in refined maleic anhydride by potentiometric titration.
1.2 This test method is applicable for all concentrations of maleic acid; however, it is primarily used for concentrations below 0.5 %.
1.3 The following applies to all specified limits in this standard: For purposes of determining conformance with this standard, an observed value or a calculated value shall be rounded off "to the nearest unit" in the last right-hand digit used in expressing the specification limit, in accordance with the rounding-off method of Practice E 29.
1.4 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. For specific hazard statements, see Section 7.
WITHDRAWN RATIONALE
This test method covers the determination of free maleic acid in refined maleic anhydride by potentiometric titration.
Formerly under the jurisdiction of Committee D16 on Aromatic Hydrocarbons and Related Chemicals, this test method was withdrawn in January 2012 in accordance with section 10.5.3.1 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date.

General Information

• Status: Withdrawn
• Publication Date: 09-Jan-2003
• Withdrawal Date: 05-Jan-2012
• ICS: 71.080.50 - Anhydrides
• Technical Committee: D16 - Aromatic, Industrial, Specialty and Related Chemicals
• Drafting Committee: D16.02 - Oxygenated Aromatics

Relations

• Replaces: ASTM D2930-94 - Standard Test Method for Maleic Acid in Maleic Anhydride by Potentiometric Titration
• Effective Date: 10-Jan-2003

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D2930–03
Standard Test Method for
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Maleic Acid in Maleic Anhydride by Potentiometric Titration
This standard is issued under the fixed designation D2930; 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.
1. Scope out in an anhydrous solvent system and followed potentio-
metricallybymeansofapHmeter.Tertiaryaminesdonotreact
1.1 Thistestmethodcoversthedeterminationoffreemaleic
with anhydrides. Only one carboxylic acid group is titrated.
acid in refined maleic anhydride by potentiometric titration.
1.2 This test method is applicable for all concentrations of
4. Significance and Use
maleic acid; however, it is primarily used for concentrations
4.1 The maleic acid content is usually an indication of
below 0.5 %.
exposure to moisture in air. Maleic anhydride reacts with
1.3 The following applies to all specified limits in this
moisture to form maleic acid.
standard: For purposes of determining conformance with this
standard, an observed value or a calculated value shall be
5. Apparatus
rounded off “to the nearest unit” in the last right-hand digit
5.1 Titrimeter or pH meter,equippedwithglassandcalomel
used in expressing the specification limit, in accordance with
electrodes. The pair of electrodes shall be mounted to extend
the rounding-off method of Practice E29.
well below the liquid level.
1.4 This standard does not purport to address all of the
5.2 Microburet, 5 or 10-mL size, graduated 20 divisions/
safety concerns, if any, associated with its use. It is the
mL.
responsibility of the user of this standard to establish appro-
5.3 Stirrer, mechanical, that will furnish a rapid stirring
priate safety and health practices and determine the applica-
action, but not such vigorous stirring that air bubbles will be
bility of regulatory limitations prior to use. For specific hazard
drawn to the electrodes of the titrimeter or pH meter.
statements, see Section 7.
5.4 Beaker, 250-mL, tall-form.
5.5 Automatic Titrator can be used in place of the above
2. Referenced Documents
2 apparatus.
2.1 ASTM Standards:
D1193 Specification for Reagent Water
6. Reagents
D3438 Practice for Sampling and Handling Naphthalene,
6.1 Purity of Reagents—Reagent grade chemicals shall be
Maleic Anhydride, and Phthalic Anhydride
used in all tests. Unless otherwise indicated, it is intended that
E29 Practice for Using Significant Digits in Test Data to
all reagents shall conform to the specifications of the Commit-
Determine Conformance with Specifications
tee onAnalytical Reagents of theAmerican Chemical Society,
2.2 Other Documents:
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where such specifications are available. Other grades may be
OSHA Regulations, 29CFR paragraphs 1910.1000 and
3 used, provided it is first ascertained that the reagent is of
1910.1200.
sufficiently high purity to permit its use without lessening the
accuracy of the determination.
3. Summary of Test Method
6.2 Purity of Water—Unless otherwise indicated, references
3.1 This test method is based on a direct titration of maleic
towatershallbeunderstoodtomeanreagentwaterconforming
acid using a tertiary amine as the base. The titration is carried
to Type IV of Specification D1193.
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6.3 Acetone, dried over Linde Type 5A molecular sieves.
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This test method is under the jurisdiction of ASTM Committee D16 on
Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of
Subcommittee D16.02 on Oxygenated Aromatics.
Current edition approved Jan. 10, 2003. Published March 2003. Originally
approved in 1970. Last previous edition approved in 1994 as D2930 – 94. DOI:
4
10.1520/D2930-03. Reagent Chemicals, American Chemical Society Specifications, American
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Chemical Society, Washington, DC. For suggestions on the testing of reagents not
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM listed by the American Chemical Society, see Analar Standards for Laboratory
Standards volume information, refer to the standard’s Document Summary page on Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
the ASTM website. and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
3
AvailablefromU.S.GovernmentPrintingOfficeSuperintendentofDocuments, MD.
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732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http:// Manufactured by Union Carbide Corp., Linde Div., 270 ParkAve., New York,
www.access.gpo.gov. NY 10017.
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