ASTM D4492-10

Standard Test Method for Analysis of Benzene by Gas Chromatography (Withdrawn 2018)

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 D852 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 for detection for non-aromatic impurities is 50 mg/kg. The lower limit of detection for individual aromatic hydrocarbon impurities 10 mg/kg. The lower limit of detection for 1,4-dioxane is 5 mg/kg.
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 E29.
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.6 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.
WITHDRAWN RATIONALE
This test method covers the determination of normally occurring trace impurities in, and the purity of, finished benzene by gas chromatography.
Formerly under the jurisdiction of Committee D16 on Aromatic, Industrial, Specialty and Related Chemicals, this test method was withdrawn in January 2018 and replaced by Test Method D7504 for Trace Impurities in Monocyclic Aromatic Hydrocarbons by Gas Chromatography and Effective Carbon Number.1

General Information

• Status: Withdrawn
• Publication Date: 14-Mar-2010
• ICS: 71.080.15 - Aromatic hydrocarbons
• Technical Committee: D16 - Aromatic, Industrial, Specialty and Related Chemicals
• Drafting Committee: D16.01 - Benzene, Toluene, Xylenes, Cyclohexane and Their Derivatives

Relations

• Replaced By: ASTM D7504-23 - Standard Test Method for Trace Impurities in Monocyclic Aromatic Hydrocarbons by Gas Chromatography and Effective Carbon Number
• Effective Date: 12-Jan-2018

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D4492 − 10
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* E29 Practice for Using Significant Digits in Test Data to
Determine Conformance with Specifications
1.1 This test method covers the determination of normally
E260 Practice for Packed Column Gas Chromatography
occurring trace impurities in, and the purity of, finished
E355 Practice for Gas Chromatography Terms and Relation-
benzene by gas chromatography.
ships
1.2 This test method is applicable for benzene purities of
E691 Practice for Conducting an Interlaboratory Study to
99.80 weight % or higher.
Determine the Precision of a Test Method
E1510 Practice for Installing Fused Silica Open Tubular
1.3 The lower limit for detection for non-aromatic impuri-
ties is 50 mg/kg. The lower limit of detection for individual Capillary Columns in Gas Chromatographs
aromatic hydrocarbon impurities 10 mg/kg. The lower limit of
2.2 Other Document:
detection for 1,4-dioxane is 5 mg/kg.
OSHA Regulations, 29 CFR paragraphs 1910.1000 and
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1910.1200
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 3. Summary of Test Method
Practice E29.
3.1 Aknown amount of an internal standard is added to the
1.5 The values stated in SI units are to be regarded as
specimen.Asmall volume of this mixture is injected into a gas
standard. No other units of measurement are included in this
chromatographequippedwithaflameionizationdetector(FID)
standard.
and a capillary column.
1.6 This standard does not purport to address all of the
3.2 The peak area of each impurity and the internal standard
safety concerns, if any, associated with its use. It is the
is measured by an electronic integrator. The concentration of
responsibility of the user of this standard to establish appro-
each impurity is calculated from the ratio of the peak area of
priate safety and health practices and determine the applica-
the internal standard versus the peak area of the impurity.
bility of regulatory limitations prior to use. For specific hazard
Purity is calculated by subtracting the sum of the impurities
statements, see Section 8.
found from 100.00 weight %. Results are reported in weight
percentforpurityandtotalimpurities,individualimpuritiesare
2. Referenced Documents
reported in units of mg/kg.
2
2.1 ASTM Standards:
D852 Test Method for Solidification Point of Benzene
4. Significance and Use
D3437 Practice for Sampling and Handling Liquid Cyclic
4.1 This test method is suitable for determining the concen-
Products
trations of known impurities in finished benzene and for use as
D6809 Guide for Quality Control and Quality Assurance
an integral quality control tool where benzene is either pro-
Procedures for Aromatic Hydrocarbons and Related Ma-
duced or used in a manufacturing procedure. It is generally
terials
applied to impurities such as nonaromatics containing nine
carbons or less, toluene, C8 aromatics, and 1,4-dioxane.
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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
4.2 Absolute purity cannot be determined if unknown im-
Subcommittee D16.01 on Benzene, Toluene, Xylenes, Cyclohexane and Their
purities are present. Test Method D852 is generally used as a
Derivatives.
criteria for determining the absolute purity.
Current edition approved March 15, 2010. Published May 2010. Originally
approved in 1985. Last previous edition approved in 2007 as D4492 – 07. DOI:
10.1520/D4492-10.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
contact ASTM Customer Service at [e-mail]. 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
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D4492 − 10
TABLE 2 Typical Calibration Blend, g
5. Interferences
Benzene 99.0000
5.1 Benzene is typically resolved from naturally occurring
Toluene 0.0500
components with boiling points <138°C. Naturally occurring
Cyclohexane
...