ASTM D5776-21

Standard Test Method for Bromine Index of Aromatic Hydrocarbons by Electrometric Titration

SIGNIFICANCE AND USE
5.1 This test method is suitable for setting specifications, for use as an internal quality control tool, and for use in development or research work on industrial aromatic hydrocarbons and related material. This test method gives a broad indication of olefinic content. It does not differentiate between the types of aliphatic unsaturation.
SCOPE
1.1 This test method determines the amount of bromine-reactive material in aromatic hydrocarbons and is thus a measure of trace amounts of unsaturates in these materials.  
1.2 This test method is applicable to materials having bromine indexes below 35. Materials with a higher bromine index can be analyzed by this method; however, the precision section does not apply.  
1.2.1 This test method is 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 In determining the conformance of the test results using this method to applicable specifications, results shall be rounded off in accordance with the rounding-off method of Practice E29.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For a specific hazard statement see Section 8.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 31-Oct-2021
• ICS: 71.080.15 - Aromatic hydrocarbons
• ICS: 71.080.20 - Halogenated hydrocarbons
• Technical Committee: D16 - Aromatic, Industrial, Specialty and Related Chemicals
• Drafting Committee: D16.04 - Instrumental Analysis

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D5776 − 21
Standard Test Method for
Bromine Index of Aromatic Hydrocarbons by Electrometric
1
Titration
This standard is issued under the fixed designation D5776; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 2. Referenced Documents
2
1.1 This test method determines the amount of bromine-
2.1 ASTM Standards:
reactive material in aromatic hydrocarbons and is thus a
D1159Test Method for Bromine Numbers of Petroleum
measure of trace amounts of unsaturates in these materials.
Distillates and Commercial Aliphatic Olefins by Electro-
metric Titration
1.2 This test method is applicable to materials having
D1193Specification for Reagent Water
bromine indexes below 35. Materials with a higher bromine
D3437Practice for Sampling and Handling Liquid Cyclic
index can be analyzed by this method; however, the precision
Products
section does not apply.
D6809Guide for Quality Control and Quality Assurance
1.2.1 This test method is applicable to aromatic hydrocar-
Procedures for Aromatic Hydrocarbons and Related Ma-
bonscontainingnomorethantraceamountsofolefinsandthat
terials
are substantially free from material lighter than isobutane and
E29Practice for Using Significant Digits in Test Data to
have a distillation end point under 288°C.
Determine Conformance with Specifications
1.3 In determining the conformance of the test results using
E691Practice for Conducting an Interlaboratory Study to
this method to applicable specifications, results shall be
Determine the Precision of a Test Method
rounded off in accordance with the rounding-off method of
2.2 Other Document:
Practice E29.
OSHA Regulations, 29 CFRparagraphs 1910.1000 and
1.4 The values stated in SI units are to be regarded as 3
1910.1200
standard. No other units of measurement are included in this
standard.
3. Terminology
1.5 This standard does not purport to address all of the
3.1 Definitions:
safety concerns, if any, associated with its use. It is the
3.1.1 bromine index, n—the number of milligrams of bro-
responsibility of the user of this standard to establish appro-
mine consumed by 100 g of sample under given conditions.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
4. Summary of Test Method
For a specific hazard statement see Section 8.
1.6 This international standard was developed in accor-
4.1 The specimen dissolved in a specified solvent is titrated
dance with internationally recognized principles on standard-
with standard bromide-bromate solution. The end point is
ization established in the Decision on Principles for the
indicatedbyafixedend-pointelectrometrictitrationapparatus,
Development of International Standards, Guides and Recom-
when the presence of free bromine causes a sudden change in
mendations issued by the World Trade Organization Technical
the polarization voltage of the system.
Barriers to Trade (TBT) Committee.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
This test method is under the jurisdiction of ASTM Committee D16 on contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Aromatic, Industrial, Specialty and Related Chemicals and is the direct responsi- Standards volume information, refer to the standard’s Document Summary page on
bility of Subcommittee D16.04 on Instrumental Analysis. the ASTM website.
3
Current edition approved Nov. 1, 2021. Published November 2021. Originally AvailablefromU.S.GovernmentPrintingOfficeSuperintendentofDocuments,
approved in 1995. Last previous edition approved in 2014 as D5776–14a. DOI: 732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http://
10.1520/D5776-21. 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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D5776 − 21
5. Significance and Use of glacial acetic acid and 1.0 mLof concentrated hydrochloric
acid (HCl, sp gr 1.19) in a 500mL iodine number flask. Chill
5.1 Thistestmethodissuitableforsettingspecifications,for
the solution in an ice bath for approximately 10 min and with
use as an internal quality control tool, and for use in develop-
constant swirling of the flask, add from a 50mL buret 40 to
mentorresearchworkonindustrialaromatichydrocarbonsand
45mL of bromide bromate solu
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM 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: D5776 − 14a D5776 − 21
Standard Test Method for
Bromine Index of Aromatic Hydrocarbons by Electrometric
1
Titration
This standard is issued under the fixed designation D5776; 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 This test method determines the amount of bromine-reactive material in aromatic hydrocarbons and is thus a measure of trace
amounts of unsaturates in these materials. It is applicable to materials having bromine indexes below 35. Materials with a higher
bromine index can be analyzed by this method; however, the precision section does not apply.
1.2 This test method is 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.materials having bromine
indexes below 35. Materials with a higher bromine index can be analyzed by this method; however, the precision section does not
apply.
1.2.1 This test method is 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 In determining the conformance of the test results using this method to applicable specifications, results shall be rounded off
in accordance with the rounding-off method of Practice E29.
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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use. For a specific hazard statement see Section 8.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
D1159 Test Method for Bromine Numbers of Petroleum Distillates and Commercial Aliphatic Olefins by Electrometric Titration
D1193 Specification for Reagent Water
D3437 Practice for Sampling and Handling Liquid Cyclic Products
1
This test method is under the jurisdiction of ASTM Committee D16 on Aromatic Hydrocarbons Aromatic, Industrial, Specialty and Related Chemicals and is the direct
responsibility of Subcommittee D16.04 on Instrumental Analysis.
Current edition approved July 1, 2014Nov. 1, 2021. Published August 2014November 2021. Originally approved in 1995. Last previous edition approved in 2014 as
D5776 – 14.D5776 – 14a. DOI: 10.1520/D5776-14A.10.1520/D5776-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*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 ----------------------
D5776 − 21
D6809 Guide for Quality Control and Quality Assurance Procedures for Aromatic Hydrocarbons and Related Materials
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
2.2 Other Document:
3
OSHA Regulations, 29 CFR paragraphs 1910.1000 and 1910.1200
3. Terminology
3.1 Definitions:
3.1.1 bromine index, n—the number of milligrams of bromine consumed by 100 g of sample under given conditions.
4. Summary of Test Method
4.1 The specimen dissolved in a specified solvent is titrated with standard bromide-bromate solution. The end point is indicated
by a fixed end-point electrometric titration apparatus, when the presence of free bromine causes a sudden change in the polarization
voltage of the system.
5. Significance and Use
5.1 This te
...