ASTM D5776-07
(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
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 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.
General Information
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Standards Content (Sample)
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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. Scope* E29 Practice for Using Significant Digits in Test Data to
Determine Conformance with Specifications
1.1 This test method determines the amount of bromine-
E 691 Practice for Conducting an Interlaboratory Study to
reactive material in aromatic hydrocarbons and is thus a
Determine the Precision of a Test Method
measureoftraceamountsofunsaturatesinthesematerials.Itis
2.2 Other Document:
applicable to materials having bromine indexes below 500.
OSHA Regulations, 29 CFR paragraphs 1910.1000 and
1.2 This test method is applicable to aromatic hydrocarbons
3
1910.1200
containing no more than trace amounts of olefins and that are
substantiallyfreefrommateriallighterthanisobutaneandhave
3. Terminology
a distillation end point under 288°C (550°F).
3.1 Definition:
1.3 In determining the conformance of the test results using
3.1.1 bromine index, n—the number of milligrams of bro-
this method to applicable specifications, results shall be
mine consumed by 100 g of sample under given conditions.
rounded off in accordance with the rounding-off method of
PracticeE29.
4. Summary of Test Method
1.4 The values stated in SI units are to be regarded as the
4.1 The specimen dissolved in a specified solvent is titrated
standard. The values given in parentheses are for information
with standard bromide-bromate solution. The end point is
only.
indicated by a fixed end-point electrometric titration apparatus,
1.5 This standard does not purport to address all of the
when the presence of free bromine causes a sudden change in
safety concerns, if any, associated with its use. It is the
the polarization voltage of the system.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5. Significance and Use
bility of regulatory limitations prior to use. For a specific
5.1 This test method is suitable for setting specification, for
hazard statement see Section 8.
use as an internal quality control tool, and for use in develop-
mentorresearchworkonindustrialaromatichydrocarbonsand
2. Referenced Documents
2 related material. This test method gives a broad indication of
2.1 ASTM Standards:
olefinic content. It does not differentiate between the types of
D 1159 Test Method for Bromine Numbers of Petroleum
aliphatic unsaturation.
Distillates and Commercial Aliphatic Olefins by Electro-
metric Titration
6. Apparatus
D 1193 Specification for Reagent Water
6.1 Fixed End Point Electrometric Titration Apparatus—
D 3437 Practice for Sampling and Handling Liquid Cyclic
Any fixed end-point apparatus may be used incorporating a
Products
high resistance polarizing current supply capable of maintain-
D 6809 Guide for Quality Control and Quality Assurance
ing approximately 10 to 50 µA across two platinum plate
Procedures for Aromatic Hydrocarbons and Related Ma-
electrodes or a combination platinum electrode and with a
terials
sensitivity such that a voltage change of approximately -500
mV at these electrodes is sufficient to indicate the end point
(see Note 1).
1
This test method is under the jurisdiction of ASTM Committee D16 on
Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of
NOTE 1—The reagents and techniques may be checked by determining
Subcommittee D16.04 on Instrumental Analysis.
the bromine index of a 100 mg/kg cyclohexene in heptane. This is
Current edition approved Aug. 1, 2007. Published September 2007. Originally
approved in 1995. Last previous edition approved in 2006 as D 5776 – 99 (2006).
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.
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D5776–07
expected to give a bromine index of 18 to 20 mg/100 g sample. Refer to
flask.Chillthesolutioninanicebathforapproximately10min
Test Method D 1159 for a list of expected bromine indexes of var
...
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