ASTM D1492-08
(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.
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 1—Other 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 288°C.
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.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 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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Designation:D1492–08
Standard Test Method for
Bromine Index of Aromatic Hydrocarbons by Coulometric
1
Titration
This standard is issued under the fixed designation D1492; 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* D1159 Test Method for Bromine Numbers of Petroleum
Distillates and Commercial Aliphatic Olefins by Electro-
1.1 Thistestmethodcoversthedeterminationoftheamount
metric Titration
of bromine-reactive material in aromatic hydrocarbons. It is
D1193 Specification for Reagent Water
usually applied to materials having bromine indexes below
D1491 Test Method for Bromine Index ofAromatic Hydro-
500.
3
carbons by Potentiometric Titration
NOTE 1—Other test methods for determining bromine-reactive material
D2710 Test Method for Bromine Index of Petroleum Hy-
are Test Methods D1159, D1491, D2710, and D5776.
drocarbons by Electrometric Titration
1.2 This test method has been found applicable to aromatic
D3437 Practice for Sampling and Handling Liquid Cyclic
hydrocarbons containing no more than trace amounts of olefins
Products
and that are substantially free from material lighter than
D3505 Test Method for Density or Relative Density of Pure
isobutane and have a distillation end point under 288°C.
Liquid Chemicals
1.3 The following applies to all specified limits in this test
D4052 Test Method for Density, Relative Density, and API
method: For purposes of determining conformance with this
Gravity of Liquids by Digital Density Meter
test method, an observed value or a calculated value shall be
D5776 Test Method for Bromine Index ofAromatic Hydro-
rounded off “to the nearest unit” in the last right-hand digit
carbons by Electrometric Titration
used in expressing the specification limit, in accordance with
D6809 Guide for Quality Control and Quality Assurance
the rounding-off method of Practice E29.
Procedures for Aromatic Hydrocarbons and Related Ma-
1.4 The values stated in SI units are to be regarded as
terials
standard. No other units of measurement are included in this
E29 Practice for Using Significant Digits in Test Data to
standard.
Determine Conformance with Specifications
1.5 This standard does not purport to address all of the
2.2 Other Document:
safety concerns, if any, associated with its use. It is the
OSHA Regulations, 29 CFR paragraphs 1910.1000 and
4
responsibility of the user of this standard to establish appro-
1910.1200
priate safety and health practices and determine the applica-
3. Terminology
bility of regulatory limitations prior to use. For a specific
hazard statement see Section 8.
3.1 Definition:
3.1.1 bromine index (B), n—the number of milligrams (mg)
2. Referenced Documents
of bromine consumed by 100 g of sample under given
2
2.1 ASTM Standards:
conditions (mg-Br/100 g).
D891 Test Methods for Specific Gravity, Apparent, of
4. Summary of Test Method
Liquid Industrial Chemicals
4.1 The specimen is added to a solvent and titrated with
electrolytically generated bromine at room temperature. The
1
This test method is under the jurisdiction of ASTM Committee D16 on
end point is determined by a dead-stop method. The time of
Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of
titration is proportional to the bromine added to the specimen.
Subcommittee D16.04 on Instrumental Analysis.
Current edition approved July 1, 2008. Published August 2008. Originally
approved in 1957. Last previous edition approved in 2007 as D1492 – 07. DOI:
3
10.1520/D1492-08. Withdrawn. The last approved version of this historical standard is referenced
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or on www.astm.org.
4
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.
1
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D1492–08
FIG. 1 Automatic Amperometric-Coulometric Titrator Circuit
5
5. Significance and Use where such specifications are available. Other grades may be
used, provided it is first ascertained that the reagent is of
5.1 This test method is useful for setting specification, for
sufficiently high purity to permit its use without lessening the
use as an internal quality control to
...
This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D1492–07 Designation:D1492–08
Standard Test Method for
Bromine Index of Aromatic Hydrocarbons by Coulometric
1
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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 Thistestmethodcoversthedeterminationoftheamountofbromine-reactivematerialinaromatichydrocarbons.Itisusually
applied to materials having bromine indexes below 500.
NOTE 1—Other 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 288°C.
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.
1.4
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D 891 Test Methods for Specific Gravity, Apparent, of Liquid Industrial Chemicals
D 1159 Test Method for Bromine Numbers of Petroleum Distillates and Commercial Aliphatic Olefins by Electrometric
Titration
D 1193 Specification for Reagent Water
3
D 1491 Test Method for Bromine Index of Aromatic Hydrocarbons by Potentiometric Titration
D 2710 Test Method for Bromine Index of Petroleum Hydrocarbons by Electrometric Titration
D 3437 Practice for Sampling and Handling Liquid Cyclic Products
D 3505 Test Method for Density or Relative Density of Pure Liquid Chemicals
D 4052 Test Method for Density and Relative Density of Liquids by Digital Density Meter
D 5776 Test Method for Bromine Index of Aromatic Hydrocarbons by Electrometric Titration
D 6809 Guide for Quality Control and Quality Assurance Procedures for Aromatic Hydrocarbons and Related Materials
E 29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
2.2 Other Document:
OSHA Regulations, 29CFR, paragraphs 1910.1000 and OSHA Regulations 29 CFR paragraphs 1910.1000 and
4
1910.1200
3. Terminology
3.1 Definition:
1
This test method is under the jurisdiction ofASTM Committee D16 onAromatic Hydrocarbons and Related Chemicals and is the direct responsibility of Subcommittee
D16.04 on Instrumental Analysis.
Current edition approved Feb.July 1, 2007.2008. Published March 2007.August 2008. Originally approved in 1957. Last previous edition approved in 20022007 as
D 1492 – 027.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Withdrawn.
4
Available from U.S. Government Printing Office Superintendent of Documents, 732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http://
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.
1
---------------------- Page: 1 ----------------------
D1492–08
3.1.1 bromine index (B), n—the number of milligrams (mg) of bromine consumed by 100 g of sample under given conditions
(mg-Br/100 g).
4. Summary of Test Method
4.1 The specimen is added to a solvent and titrated with electrolytically generated bromine at room temperature. The end point
is determined by a dead-stop method. The time of titration is proportional to the bromine added to the specimen.
5. Significance and Use
5.1 This test method is useful for setting specification, for use as an internal quality cont
...
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