ASTM D1492-07
(Test Method)Standard Test Method for Bromine Index of Aromatic Hydrocarbons by Coulometric Titration
Standard Test Method for Bromine Index of Aromatic Hydrocarbons by Coulometric Titration
SIGNIFICANCE AND USE
This test method is useful for setting specification, for use as an internal quality control tool, and for use in development or research work on industrial aromatic hydrocarbons and related materials. This test method gives a broad indication of olefinic content. It will not differentiate between the types of aliphatic unsaturation.
FIG. 1 Automatic Amperometric-Coulometric Titrator Circuit
SCOPE
1.1 This test method covers the determination of the amount of bromine-reactive material in aromatic hydrocarbons. It is usually applied to materials having bromine indexes below 500. Note 1Other test methods for determining bromine-reactive material are Test Methods D 1159, D 1491, D 2710, and D 5776.
1.2 This test method has been found applicable to aromatic hydrocarbons containing no more than trace amounts of olefins and that are substantially free from material lighter than isobutane and have a distillation end point under 288C.
1.3 The following applies to all specified limits in this test method: For purposes of determining conformance with this test method, 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.
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 a specific hazard statement see Section 8.
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Standards Content (Sample)
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Designation:D1492–07
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.
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1. Scope* drocarbons by Potentiometric Titration
D 2710 Test Method for Bromine Index of Petroleum Hy-
1.1 Thistestmethodcoversthedeterminationoftheamount
drocarbons by Electrometric Titration
of bromine-reactive material in aromatic hydrocarbons. It is
D 3437 Practice for Sampling and Handling Liquid Cyclic
usually applied to materials having bromine indexes below
Products
500.
D 3505 Test Method for Density or Relative Density of
NOTE 1—Other test methods for determining bromine-reactive material
Pure Liquid Chemicals
are Test Methods D 1159, D 1491, D 2710, and D 5776.
D 4052 Test Method for Density and Relative Density of
1.2 This test method has been found applicable to aromatic
Liquids by Digital Density Meter
hydrocarbons containing no more than trace amounts of olefins
D 5776 Test Method for Bromine Index of Aromatic Hy-
and that are substantially free from material lighter than
drocarbons by Electrometric Titration
isobutane and have a distillation end point under 288°C.
D 6809 Guide for Quality Control and Quality Assurance
1.3 The following applies to all specified limits in this test
Procedures for Aromatic Hydrocarbons and Related Ma-
method: For purposes of determining conformance with this
terials
test method, an observed value or a calculated value shall be
E29 Practice for Using Significant Digits in Test Data to
rounded off “to the nearest unit” in the last right-hand digit
Determine Conformance with Specifications
used in expressing the specification limit, in accordance with
2.2 Other Document:
the rounding-off method of PracticeE29.
OSHA Regulations, 29 CFR, paragraphs 1910.1000 and
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1.4 This standard does not purport to address all of the
1910.1200
safety concerns, if any, associated with its use. It is the
3. Terminology
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
3.1 Definition:
bility of regulatory limitations prior to use. For a specific
3.1.1 bromine index (B), n—the number of milligrams (mg)
hazard statement see Section 8.
of bromine consumed by 100 g of sample under given
conditions (mg-Br/100 g).
2. Referenced Documents
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4. Summary of Test Method
2.1 ASTM Standards:
D 891 Test Methods for Specific Gravity, Apparent, of
4.1 The specimen is added to a solvent and titrated with
Liquid Industrial Chemicals
electrolytically generated bromine at room temperature. The
D 1159 Test Method for Bromine Numbers of Petroleum
end point is determined by a dead-stop method. The time of
Distillates and Commercial Aliphatic Olefins by Electro-
titration is proportional to the bromine added to the specimen.
metric Titration
5. Significance and Use
D 1193 Specification for Reagent Water
D 1491 Test Method for Bromine Index of Aromatic Hy- 5.1 This test method is useful for setting specification, for
use as an internal quality control tool, and for use in develop-
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
olefinic content. It will not differentiate between the types of
Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of
Subcommittee D16.04 on Instrumental Analysis. aliphatic unsaturation.
Current edition approved Feb. 1, 2007. Published March 2007. Originally
approved in 1957. Last previous edition approved in 2002 as D 1492 – 02.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or Withdrawn.
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contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM AvailablefromU.S.GovernmentPrintingOfficeSuperintendentofDocuments,
Standards volume information, refer to the standard’s Document Summary page on 732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http://
the ASTM website. www.access.gpo.gov.
*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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D1492–07
FIG. 1 Automatic Amperometric-Coulometric Titrator Circuit
6. Apparatus 7.3 Electrolyte—To make 1 L, mix 600 mLof glacial acetic
acid, 260 mL of absolute methanol, and 140 mL of KBr
6.1 Amperometric-Coulometric Apparatus, automatic, suit-
solutio
...
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