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ASTM D4492-03

(Test Method)

Standard Test Method for Analysis of Benzene by Gas Chromatography

Standard Test Method for Analysis of Benzene by Gas Chromatography

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 was judged applicable for nonaromatic impurities at levels from 0.001 to 0.200 weight % and for benzene purities of 99.80 weight % or higher.
1.3 This test method is applicable for aromatic impurities from 0.001 to 0.010 weight % in benzene.
1.4 The following applies to all specified limits in this standard: for purposes of determining conformance with this standard, an observed value or a calculated 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 E 29.
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 specific hazard statements, see Section 8.

General Information

Status
Historical
Publication Date
09-Jun-2003
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
Current Stage
Ref Project

Relations

Replaces
ASTM D4492-98 - Standard Test Method for Analysis of Benzene by Gas Chromatography
Effective Date
10-Jun-2003
Replaced By
ASTM D4492-07 - Standard Test Method for Analysis of Benzene by Gas Chromatography
Effective Date
01-Jun-2007

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ASTM D4492-03 - Standard Test Method for Analysis of Benzene by Gas Chromatography
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D4492–03
Standard Test Method for
1
Analysis of Benzene by Gas Chromatography
This standard is issued under the fixed designation D 4492; 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.
3
1. Scope* Determine the Precision of a Test Method
E 1510 Practice for Installing Fused Silica Open Tubular
1.1 This test method covers the determination of normally
4
Capillary Columns in Gas Chromatographs
occurring trace impurities in, and the purity of, finished
2.2 Other Document:
benzene by gas chromatography.
OSHA Regulations. 29 CFR, paragraphs 1910.1000 and
1.2 This test method was judged applicable for nonaromatic
5
1910.1200
impurities at levels from 0.001 to 0.200 weight % and for
benzene purities of 99.80 weight % or higher.
3. Summary of Test Method
1.3 This test method is applicable for aromatic impurities
3.1 Aknown amount of an internal standard is added to the
from 0.001 to 0.010 weight % in benzene.
specimen.Asmall volume of this mixture is injected into a gas
1.4 The following applies to all specified limits in this
chromatographequippedwithaflameionizationdetector(FID)
standard: for purposes of determining conformance with this
and a capillary column.
standard, an observed value or a calculated value shall be
3.2 The peak area of each impurity and the internal standard
rounded off “to the nearest unit” in the last right-hand digit
is measured by an electronic integrator. The concentration of
used in expressing the specification limit in accordance with
each impurity is calculated from the ratio of the peak area of
the rounding-off method of Practice E 29.
the internal standard versus the peak area of the impurity.
1.5 This standard does not purport to address all of the
Purity is calculated by subtracting the sum of the impurities
safety concerns, if any, associated with its use. It is the
found from 100.00 weight %. Results are reported in weight
responsibility of the user of this standard to establish appro-
percent.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. For specific hazard
4. Significance and Use
statements, see Section 8.
4.1 This test method is suitable for determining the concen-
trations of known impurities in finished benzene and for use as
2. Referenced Documents
an integral quality control tool where benzene is either pro-
2.1 ASTM Standards:
2 duced or used in a manufacturing procedure. It is generally
D 852 Test Method for Solidification Point of Benzene
applied to impurities such as nonaromatics containing nine
D 3437 Practice for Sampling and Handling Liquid Cyclic
2 carbons or less, toluene, C8 aromatics, and 1, 4-dioxane.
Products
4.2 Absolute purity cannot be determined if unknown im-
E 29 Practice for Using Significant Digits in Test Data to
3 purities are present. Test Method D 852 is generally used as a
Determine Conformance with Specifications
4 criteria for determining the absolute purity.
E 260 Practice for Packed Column Gas Chromatography
E 355 Practice for Gas Chromatography Terms and Rela-
5. Interferences
4
tionships
5.1 Benzene is typically resolved from naturally occurring
E 691 Practice for Conducting an Interlaboratory Study to
components with boiling points <138°C. Naturally occurring
components include nonaromatic hydrocarbons, toluene, C8
1 aromatics, and 1, 4-dioxane.An adequate separation of known
This test method is under the jurisdiction of ASTM Committee D16 on
Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of impurities from benzene should be evaluated for the column
Subcommittee D16.01 on Benzene, Toluene, Xylenes, Cyclohexane and Their
selected.
Derivatives.
Current edition approved June 10, 2003. Published July 2003. Originally
approved in 1985. Last previous edition approved in 1998 as D 4492 - 98.
2
Annual Book of ASTM Standards, Vol 06.04.
3 5
Annual Book of ASTM Standards, Vol 14.02. AvailablefromU.S.GovernmentPrintingOfficeSuperintendentofDocuments,
4
Annual Book of ASTM Standards, Vol 03.06. 732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401.
*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 ----------------------
D4492–03
5.2 The internal standard chosen must be sufficiently re- 9. Sampling
solved from any impurity and the benzene peak.
9.1 Sample the material in accordance with Practice
D 3437.
6. Apparatus
6.1 Gas Chromatograph—Any chromatograph having a
10. Prepa
...

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