ASTM D4492-07
(Test Method)Standard Test Method for Analysis of Benzene by Gas Chromatography
Standard Test Method for Analysis of Benzene by Gas Chromatography
SIGNIFICANCE AND USE
This test method is suitable for determining the concentrations of known impurities in finished benzene and for use as an integral quality control tool where benzene is either produced or used in a manufacturing procedure. It is generally applied to impurities such as nonaromatics containing nine carbons or less, toluene, C8 aromatics, and 1,4-dioxane.
Absolute purity cannot be determined if unknown impurities are present. Test Method D 852 is generally used as a criteria for determining the absolute purity.
SCOPE
1.1 This test method covers the determination of normally occurring trace impurities in, and the purity of, finished benzene by gas chromatography.
1.2 This test method is applicable for benzene purities of 99.80 weight % or higher.
1.3 The lower limit of detection for total non-aromatic impurities is 0.005 weight %. The lower limit of detection for individual aromatic hydrocarbon impurities in 0.001 weight %. The lower limit of detection for 1,4-dioxane is 0.0005 weight %.
1.4 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.
1.5 &solely-SI-units;
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 specific hazard statements, see Section 8.
General Information
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Standards Content (Sample)
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Designation:D4492–07
Standard Test Method for
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Analysis of Benzene by Gas Chromatography
This standard is issued under the fixed designation D4492; 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* Determine Conformance with Specifications
E260 Practice for Packed Column Gas Chromatography
1.1 This test method covers the determination of normally
E355 Practice for Gas Chromatography Terms and Rela-
occurring trace impurities in, and the purity of, finished
tionships
benzene by gas chromatography.
E691 Practice for Conducting an Interlaboratory Study to
1.2 This test method is applicable for benzene purities of
Determine the Precision of a Test Method
99.80 weight % or higher.
E1510 Practice for Installing Fused Silica Open Tubular
1.3 The lower limit of detection for total nonaromatic
Capillary Columns in Gas Chromatographs
impurities is 0.005 weight %. The lower limit of detection for
2.2 Other Document:
individual aromatic hydrocarbon impurities in 0.001 weight %.
OSHA Regulations, 29 CFR paragraphs 1910.1000 and
The lower limit of detection for 1,4-dioxane is 0.0005 weight
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1910.1200
%.
1.4 In determining the conformance of the test results using
3. Summary of Test Method
this method to applicable specifications, results shall be
3.1 Aknown amount of an internal standard is added to the
rounded off in accordance with the rounding off method of
specimen.Asmall volume of this mixture is injected into a gas
Practice E29.
chromatographequippedwithaflameionizationdetector(FID)
1.5 The values stated in SI units are to be regarded as
and a capillary column.
standard. No other units of measurement are included in this
3.2 The peak area of each impurity and the internal standard
standard.
is measured by an electronic integrator. The concentration of
1.6 This standard does not purport to address all of the
each impurity is calculated from the ratio of the peak area of
safety concerns, if any, associated with its use. It is the
the internal standard versus the peak area of the impurity.
responsibility of the user of this standard to establish appro-
Purity is calculated by subtracting the sum of the impurities
priate safety and health practices and determine the applica-
found from 100.00 weight %. Results are reported in weight
bility of regulatory limitations prior to use. For specific hazard
percent.
statements, see Section 8.
4. Significance and Use
2. Referenced Documents
2 4.1 This test method is suitable for determining the concen-
2.1 ASTM Standards:
trations of known impurities in finished benzene and for use as
D852 Test Method for Solidification Point of Benzene
an integral quality control tool where benzene is either pro-
D3437 Practice for Sampling and Handling Liquid Cyclic
duced or used in a manufacturing procedure. It is generally
Products
applied to impurities such as nonaromatics containing nine
D6809 Guide for Quality Control and Quality Assurance
carbons or less, toluene, C8 aromatics, and 1,4-dioxane.
Procedures for Aromatic Hydrocarbons and Related Ma-
4.2 Absolute purity cannot be determined if unknown im-
terials
purities are present. Test Method D852 is generally used as a
E29 Practice for Using Significant Digits in Test Data to
criteria for determining the absolute purity.
5. Interferences
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This test method is under the jurisdiction of ASTM Committee D16 on
Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of 5.1 Benzene is typically resolved from naturally occurring
Subcommittee D16.01 on Benzene, Toluene, Xylenes, Cyclohexane and Their
components with boiling points <138°C. Naturally occurring
Derivatives.
components include nonaromatic hydrocarbons, toluene, C8
Current edition approved June 1, 2007. Published June 2007. Originally
approved in 1985. Last previous edition approved in 2003 as D4492 - 03. DOI:
10.1520/D4492-07.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
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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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D4492–07
aromatics, and 1,4-dioxane. An adequate separation of known 8. Hazards
impurit
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