ASTM D5776-13
(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
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.
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.
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 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: D5776 − 13
StandardTest 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* D3437Practice for Sampling and Handling Liquid Cyclic
Products
1.1 This test method determines the amount of bromine-
D6809Guide for Quality Control and Quality Assurance
reactive material in aromatic hydrocarbons and is thus a
Procedures for Aromatic Hydrocarbons and Related Ma-
measureoftraceamountsofunsaturatesinthesematerials.Itis
terials
applicable to materials having bromine indexes below 35.
E29Practice for Using Significant Digits in Test Data to
Materials with a higher bromine index can be analyzed by this
Determine Conformance with Specifications
method; however, the precision section does not apply.
E691Practice 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 CFRparagraphs 1910.1000 and
a distillation end point under 288°C. 3
1910.1200
1.3 In determining the conformance of the test results using
3. Terminology
this method to applicable specifications, results shall be
rounded off in accordance with the rounding-off method of
3.1 Definitions:
Practice E29.
3.1.1 bromine index, n—the number of milligrams of bro-
mine consumed by 100 g of sample under given conditions.
1.4 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
4. Summary of Test Method
standard.
4.1 The specimen dissolved in a specified solvent is titrated
1.5 This standard does not purport to address all of the
with standard bromide-bromate solution. The end point is
safety concerns, if any, associated with its use. It is the
indicatedbyafixedend-pointelectrometrictitrationapparatus,
responsibility of the user of this standard to establish appro-
when the presence of free bromine causes a sudden change in
priate safety and health practices and determine the applica-
the polarization voltage of the system.
bility of regulatory limitations prior to use. For a specific
hazard statement see Section 8.
5. Significance and Use
2. Referenced Documents 5.1 This test method is suitable for setting specification, for
2 use as an internal quality control tool, and for use in develop-
2.1 ASTM Standards:
mentorresearchworkonindustrialaromatichydrocarbonsand
D1159Test Method for Bromine Numbers of Petroleum
related material. This test method gives a broad indication of
Distillates and Commercial Aliphatic Olefins by Electro-
olefinic content. It does not differentiate between the types of
metric Titration
aliphatic unsaturation.
D1193Specification for Reagent Water
6. Apparatus
1 6.1 Fixed End Point Electrometric Titration Apparatus—
This test method is under the jurisdiction of ASTM Committee D16 on
Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of
Any fixed end-point apparatus may be used incorporating a
Subcommittee D16.04 on Instrumental Analysis.
high resistance polarizing current supply capable of maintain-
Current edition approved July 15, 2013. Published July 2013. Originally
ing approximately 1 to 50 µA across two platinum plate
approved in 1995. Last previous edition approved in 2012 as D5776–07 (2012).
DOI: 10.1520/D5776-13.
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
---------------------- Page: 1 ----------------------
D5776 − 13
electrodes or a combination platinum electrode and with a sodium thiosulphate (Na S O ) solution. Near the end of the
2 2 3
sensitivity such that a voltage change of approximately 500 titrationadd1mLofstarchindicatorsolutionandtitrateslowly
mV at these electrodes is sufficient to indicate the end point
to the disappearance of the blue color.
(see Note 1).
7.4 Electronic Standardization of Bromide-Bromate
NOTE
...
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 − 07 (Reapproved 2012) D5776 − 13
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 500.35. 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 (550°F).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 the standard. The values given in parentheses are for information
only.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:
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
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.
1
This test method is under the jurisdiction of ASTM Committee D16 on Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of Subcommittee
D16.04 on Instrumental Analysis.
Current edition approved Jan. 1, 2012July 15, 2013. Published January 2012July 2013. Originally approved in 1995. Last previous edition approved in 20072012 as
ε1
D5776 – 07 (2012). . DOI: 10.1520/D5776-07R12. 10.1520/D5776-13.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM 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 ----------------------
D5776 − 13
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 Electrometric Titration Apparatus—Any fixed end-point apparatus may be used incorporating a high
resistance polarizing current supp
...
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