ASTM D5776-07e1
(Test Method)Standard Test Method for Bromine Index of Aromatic Hydrocarbons by Electrometric Titration
Standard Test Method for Bromine Index of Aromatic Hydrocarbons by Electrometric Titration
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 500.
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 (550°F).
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 E 29.
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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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´1
Designation:D5776–07
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
´ NOTE—An editorial correction was made in 6.1 in November 2007.
1. Scope* D6809 Guide for Quality Control and Quality Assurance
Procedures for Aromatic Hydrocarbons and Related Ma-
1.1 This test method determines the amount of bromine-
terials
reactive material in aromatic hydrocarbons and is thus a
E29 Practice for Using Significant Digits in Test Data to
measureoftraceamountsofunsaturatesinthesematerials.Itis
Determine Conformance with Specifications
applicable to materials having bromine indexes below 500.
E691 Practice for Conducting an Interlaboratory Study to
1.2 This test method is applicable to aromatic hydrocarbons
Determine the Precision of a Test Method
containing no more than trace amounts of olefins and that are
2.2 Other Document:
substantiallyfreefrommateriallighterthanisobutaneandhave
OSHA Regulations, 29 CFR paragraphs 1910.1000 and
a distillation end point under 288°C (550°F).
3
1910.1200
1.3 In determining the conformance of the test results using
this method to applicable specifications, results shall be
3. Terminology
rounded off in accordance with the rounding-off method of
3.1 Definition:
Practice E29.
3.1.1 bromine index, n—the number of milligrams of bro-
1.4 The values stated in SI units are to be regarded as the
mine consumed by 100 g of sample under given conditions.
standard. The values given in parentheses are for information
only.
4. Summary of Test Method
1.5 This standard does not purport to address all of the
4.1 The specimen dissolved in a specified solvent is titrated
safety concerns, if any, associated with its use. It is the
with standard bromide-bromate solution. The end point is
responsibility of the user of this standard to establish appro-
indicated by a fixed end-point electrometric titration apparatus,
priate safety and health practices and determine the applica-
when the presence of free bromine causes a sudden change in
bility of regulatory limitations prior to use. For a specific
the polarization voltage of the system.
hazard statement see Section 8.
5. Significance and Use
2. Referenced Documents
2 5.1 This test method is suitable for setting specification, for
2.1 ASTM Standards:
use as an internal quality control tool, and for use in develop-
D1159 Test Method for Bromine Numbers of Petroleum
mentorresearchworkonindustrialaromatichydrocarbonsand
Distillates and Commercial Aliphatic Olefins by Electro-
related material. This test method gives a broad indication of
metric Titration
olefinic content. It does not differentiate between the types of
D1193 Specification for Reagent Water
aliphatic unsaturation.
D3437 Practice for Sampling and Handling Liquid Cyclic
Products
6. Apparatus
6.1 Fixed End Point Electrometric Titration Apparatus—
Any fixed end-point apparatus may be used incorporating a
1
This test method is under the jurisdiction of ASTM Committee D16 on
high resistance polarizing current supply capable of maintain-
Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of
ing approximately 10 to 50 µA across two platinum plate
Subcommittee D16.04 on Instrumental Analysis.
electrodes or a combination platinum electrode and with a
Current edition approved Aug. 1, 2007. Published September 2007. Originally
approved in 1995. Last previous edition approved in 2006 as D5776 – 99 (2006).
DOI: 10.1520/D5776-07E01.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
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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D5776–07
sensitivity such that a voltage change of approximately 500 7.4 Electronic Standardization of Bromide-Bromate
mV at these electrodes is sufficient to indicate the end point Solution—Standardize to four significant figures as follows:
(see Note 1). Place 50 mL of glacial acetic acid and 1.0 mL of concentrated
hydrochloric acid (HCl, sp gr 1.19) in a 500-mLiodine nu
...
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.
e1
Designation:D5776–99(Reapproved2006) Designation:D5776–07
Standard Test Method for
Bromine Index of Aromatic Hydrocarbons by Electrometric
1
Titration
This standard is issued under the fixed designation D 5776; 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
e NOTE—An editorial correction was made in 6.1 in November 2007.
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 500.
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 (550°F).
1.3The following applies to all specified limits in this standard: For purposes of determining conformance with this standard,
an observed 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 E29
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 E 29.
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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 1159 Test Method for Bromine Numbers of Petroleum Distillates and Commercial Aliphatic Olefins by Electrometric
Titration
D 1193 Specification for Reagent Water
D 3437 Practice for Sampling and Handling Liquid Cyclic Products
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
E 691 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 Definition:
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
byafixedend-pointelectrometrictitrationapparatus,whenthepresenceoffreebrominecausesasuddenchangeinthepolarization
voltage of the system.
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 JuneAug. 1, 2006.2007. Published June 2006.September 2007. Originally approved in 1995. Last previous edition approved in 19992006 as
D 5776 – 99 (2006).
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
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 ----------------------
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D5776–07
5. Significance and Use
5.1 This test method is suitable 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 material. This test method gives a broad indication of olefinic
content. It does not differentiate between the types of aliphatic unsaturation.
6. Apparatus
6.1 Fixed End Point
...
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