ASTM E1788-16

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Designation: E1788 − 16
Standard Test Method for
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Acidity in Acrylonitrile
This standard is issued under the fixed designation E1788; 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* 4. Significance and Use
1.1 This test method covers the determination of total 4.1 This test method is useful for determining low levels of
acidity as acetic acid in concentrations below 500 µg/g in acidity, below 500 µg/g in acrylonitrile. The total acidity is
acrylonitrile. calculated as acetic acid.
1.2 The values stated in SI units are to be regarded as 4.2 Acidity may be present as a result of contamination or
standard. No other units of measurement are included in this decomposition during storage, distribution, or manufacture.
standard.
5. Apparatus
1.3 This standard does not purport to address all of the
5.1 Buret, 10 mL, graduated in 0.05 mL subdivision.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
6. Purity of Reagents
priate safety and health practices and determine the applica-
6.1 Use reagent grade chemicals in all tests. Unless other-
bility of regulatory limitations prior to use. Specific hazard
wise indicated, all reagents shall conform to the specifications
statements are given in Section 8.
of the Committee on Analytical Reagents of the American
1.4 Review the current Safety Data Sheets (SDS) for de-
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Chemical Society, where such specifications are available.
tailed information concerning toxicity, first aid procedures, and
Other grades may be used provided it is first ascertained that
safety precautions.
the reagent is of sufficiently high purity to permit its use
1.5 This international standard was developed in accor-
without lessening the accuracy of the determination.
dance with internationally recognized principles on standard-
6.2 Unless otherwise indicated, references to water mean
ization established in the Decision on Principles for the
reagent water conforming to Type II or Type III of Specifica-
Development of International Standards, Guides and Recom-
tion D1193.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
7. Reagents
7.1 Bromthymol Blue Indicator Solution (1 g/L)—Weigh
2. Referenced Documents
100 mg into a 150 mL beaker, add 1.5 mL of 0.1 meq/mL
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2.1 ASTM Standards:
NaOH to aid in dissolving, gradually add 100 mLof methanol.
D1193 Specification for Reagent Water
Neutralize to a deep green by dropwise addition of 0.02
E200 Practice for Preparation, Standardization, and Storage
meq/mL NaOH.
of Standard and Reagent Solutions for ChemicalAnalysis
7.2 Sodium Hydroxide Standard Solution (0.02 meq/mL)—
Dissolve 0.800 g NaOH in 500 mL of methanol and dilute to
3. Summary of Test Method
1 L with methanol. Standardize in accordance with the appro-
3.1 The acrylonitrile sample is titrated with alcoholic so-
priate sections of Practice E200.
dium hydroxide solution to the visual end point.
8. Hazards
8.1 Acrylonitrile is potentially hazardous to human health if
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This test method is under the jurisdiction ofASTM Committee D20 on Plastics not properly handled. Acrylonitrile is a suspected human
and is the direct responsibility of Subcommittee D20.15 on Thermoplastic Materi-
carcinogen. Use acrylonitrile in a well ventilated hood.
als.
Current edition approved April 1, 2016. Published May 2016. Originally
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approved in 1996. Last previous edition approved in 2008 as E1788 – 08. DOI: Reagent Chemicals, American Chemical Society Specifications, American
10.1520/E1788-16. Chemical Society, Washington, DC. For suggestions on the testing of reagents not
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or listed by the American Chemical Society, see Analar Standards for Laboratory
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
Standards volume information, refer to the standard’s Document Summary page on and National Formulary, U.S. Pharmacopeial Convention, Inc. (USP), Rockville,
the ASTM website. MD.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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E1788 − 16
8.2 Acrylonitrile can contribute to a toxic condition in 12.1.1 Repeatability (Single Analyst)—The standard devia-
systems of the human body from inhalation, swallowing, or tion for a single determination h
...