ASTM D1492-02

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Designation:D1492–02
Standard Test Method for
Bromine Index of Aromatic Hydrocarbons by Coulometric
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Titration
This standard is issued under the fixed designation D 1492; 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.
1. Scope D 1491 Test Method for Bromine Index of Aromatic Hy-
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drocarbons by Potentiometric Titration
1.1 This test method covers the determination of the amount
D 2710 Test Method for Bromine Index of Petroleum Hy-
of bromine-reactive material in aromatic hydrocarbons. It is
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drocarbons by Electrometric Titration
usually applied to materials having bromine indexes below
D 3437 Practice for Sampling and Handling Liquid Cyclic
500.
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Products
NOTE 1—Other test methods for determining bromine-reactive material
D 3505 Test Method for Density or Relative Density of
are Test Methods D 1159, D 1491, D 2710, and D 5776.
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Pure Liquid Chemicals
1.2 This test method has been found applicable to aromatic
D 4052 Test Method for Density and Relative Density of
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hydrocarbons containing no more than trace amounts of olefins
Liquids by Digital Density Meter
and that are substantially free from material lighter than
D 5776 Test Method for Bromine Index of Aromatic Hy-
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isobutane and have a distillation end point under 288°C.
drocarbons by Electrometric Titration
1.3 The following applies to all specified limits in this test
E 29 Practice for Using Significant Digits in Test Data to
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method: For purposes of determining conformance with this
Determine Conformance with Specifications
test method, an observed value or a calculated value shall be
2.2 Other Document:
rounded off “to the nearest unit” in the last right-hand digit
OSHA Regulations, 29 CFR, paragraphs 1910.1000 and
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used in expressing the specification limit, in accordance with
1910.1200
the rounding-off method of Practice E 29.
3. Terminology
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3.1 Definition:
responsibility of the user of this standard to establish appro-
3.1.1 bromine index—the number of milligrams of bromine
priate safety and health practices and determine the applica-
consumed by 100 g of sample under given conditions.
bility of regulatory limitations prior to use. For a specific
4. Summary of Test Method
hazard statement see Section 8.
4.1 The specimen is added to a solvent and titrated with
2. Referenced Documents
electrolytically generated bromine at room temperature. The
2.1 ASTM Standards:
end point is determined by a dead-stop method. The time of
D 891 Test Methods for Specific Gravity, Apparent, of
titration is proportional to the bromine added to the specimen.
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Liquid Industrial Chemicals
5. Significance and Use
D 1159 Test Method for Bromine Number of Petroleum
Distillates and Commercial Aliphatic Olefins by Electro-
5.1 This test method is useful for setting specification, for
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metric Titration use as an internal quality control tool, and for use in develop-
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D 1193 Specification for Reagent Water
mentorresearchworkonindustrialaromatichydrocarbonsand
related materials. This test method gives a broad indication of
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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
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Subcommittee D16.04 on Instrumental Analysis. Discontinued; see 1985 Annual Book of ASTM Standards, Vol 06.03.
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Current edition approved June 10, 2002. Published August 2002. Originally Annual Book of ASTM Standards, Vol 05.02.
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published as D 1492 – 57 T. Last previous edition D 1492 – 96 (2000). Annual Book of ASTM Standards, Vol 06.04.
2 8
Annual Book of ASTM Standards, Vol 15.05. Annual Book of ASTM Standards, Vol 14.02.
3 9
Annual Book of ASTM Standards, Vol 05.01. Available from Superintendent of Documents, U.S. Government Printing
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Annual Book of ASTM Standards, Vol 11.01. Office, Washington, DC 20402.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D1492
olefinic content. It will not differentiate between the types of 7.2 Purity of Water—Unless otherwise indicated, references
aliphatic unsaturation. to water shall be understood to mean reagent water conforming
FIG. 1 Automatic Amperometric-Coulometric Titrator Circuit
6. Apparatus to Type IV of Specification D 1193.
7.3 Electrolyte—To make 1 L, mix 600 mLof glacial acetic
6.1 Amperometric-Coulometric Apparatus, automatic, suit-
acid, 260 mL of absolute methanol, and 140 mL of KBr
able for bromine index tit
...