ASTM D7504-09e1
(Test Method)Standard Test Method for Trace Impurities in Monocyclic Aromatic Hydrocarbons by Gas Chromatography and Effective Carbon Number
Standard Test Method for Trace Impurities in Monocyclic Aromatic Hydrocarbons by Gas Chromatography and Effective Carbon Number
SIGNIFICANCE AND USE
Determining the type and amount of hydrocarbon impurities remaining from the manufacture of toluene, mixed xylenes, and p-xylene used as chemical intermediates and solvents is often required. This test method is suitable for setting specifications and for use as an internal quality control tool where these products are produced or are used. Typical impurities are: alkanes containing 1 to 10 carbons atoms, benzene, toluene, ethylbenzene (EB), xylenes, and aromatic hydrocarbons containing nine carbon atoms.
This method may not detect all components and there may be unknown components that would be assigned inappropriate response factors and thus, the results may not be absolute.
SCOPE
1.1 This test method covers the determination of the total nonaromatic hydrocarbons and trace monocyclic aromatic hydrocarbons in toluene, mixed xylenes, and p-xylene by gas chromatography. The purity of toluene, mixed xylenes, or p-xylene can also be calculated. Similar test methods, using the internal standard calibration technique and the external standard calibration technique, are Test Method D2360 and D5917 respectively.
1.2 Total aliphatic hydrocarbons containing 1 through 10 carbon atoms (methane through decanes) can be detected by this test method at concentrations ranging from 0.0001 to 2.5000 weight %. The limit of detection is 0.00003 weight % and the limit of quantitation is 0.0001 weight %.
1.2.1 A small amount of benzene in mixed xylenes or p-xylene may not be distinguished from the non-aromatics and the concentrations are determined as a composite (see 6.1).
1.3 Monocyclic aromatic hydrocarbon impurities containing 6 through 10 carbon atoms (benzene through C10 aromatics) can be detected by this test method at individual concentrations ranging from 0.0001 to 1.0000 weight %.
1.4 The following applies to all specified limits in this test method: for purposes of determining conformance with this test method, 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 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.
General Information
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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
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Designation: D7504 – 09
Standard Test Method for
Trace Impurities in Monocyclic Aromatic Hydrocarbons by
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Gas Chromatography and Effective Carbon Number
This standard is issued under the fixed designation D7504; 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.
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´ NOTE—Table 1 was corrected editorially in March 2010.
1. Scope priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
1.1 This test method covers the determination of the total
nonaromatic hydrocarbons and trace monocyclic aromatic
2. Referenced Documents
hydrocarbons in toluene, mixed xylenes, and p-xylene by gas
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2.1 ASTM Standards:
chromatography. The purity of toluene, mixed xylenes, or
D841 Specification for Nitration Grade Toluene
p-xylenecanalsobecalculated.Similartestmethods,usingthe
D2360 Test Method for Trace Impurities in Monocyclic
internal standard calibration technique and the external stan-
Aromatic Hydrocarbons by Gas Chromatography
dard calibration technique, are Test Method D2360 and D5917
D3437 Practice for Sampling and Handling Liquid Cyclic
respectively.
Products
1.2 Total aliphatic hydrocarbons containing 1 through 10
D4534 Test Method for Benzene Content of Cyclic Prod-
carbon atoms (methane through decanes) can be detected by
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ucts by Gas Chromatography
this test method at concentrations ranging from 0.0001 to
D4790 TerminologyofAromaticHydrocarbonsandRelated
2.5000 weight %. The limit of detection is 0.00003 weight %
Chemicals
and the limit of quantitation is 0.0001 weight %.
D5136 Specification for High Purity p-Xylene
1.2.1 A small amount of benzene in mixed xylenes or
D5211 Specification for Xylenes for p-Xylene Feedstock
p-xylene may not be distinguished from the non-aromatics and
D5917 Test Method for Trace Impurities in Monocyclic
the concentrations are determined as a composite (see 6.1).
Aromatic Hydrocarbons by Gas Chromatography and
1.3 Monocyclicaromatichydrocarbonimpuritiescontaining
External Calibration
6 through 10 carbon atoms (benzene through C aromatics)
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D6809 Guide for Quality Control and Quality Assurance
canbedetectedbythistestmethodatindividualconcentrations
Procedures for Aromatic Hydrocarbons and Related Ma-
ranging from 0.0001 to 1.0000 weight %.
terials
1.4 The following applies to all specified limits in this test
E29 Practice for Using Significant Digits in Test Data to
method: for purposes of determining conformance with this
Determine Conformance with Specifications
test method, an observed value or a calculated value shall be
E177 Practice for Use of the Terms Precision and Bias in
rounded off “to the nearest unit” in the last right-hand digit
ASTM Test Methods
used in expressing the specification limit, in accordance with
E260 Practice for Packed Column Gas Chromatography
the rounding-off method of Practice E29.
E355 Practice for Gas Chromatography Terms and Rela-
1.5 The values stated in SI units are to be regarded as
tionships
standard. No other units of measurement are included in this
E691 Practice for Conducting an Interlaboratory Study to
standard.
Determine the Precision of a Test Method
1.6 This standard does not purport to address all of the
E1510 Practice for Installing Fused Silica Open Tubular
safety concerns, if any, associated with its use. It is the
Capillary Columns in Gas Chromatographs
responsibility of the user of this standard to establish appro-
2.2 Other Document:
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This test method is under the jurisdiction of ASTM Committee D16 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Subcommittee D16.01 on Benzene, Toluene, Xylenes, Cyclohexane and Their Standards volume information, refer to the standard’s Document Summary page on
Derivatives. the ASTM website.
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Current edition approved Jan. 15, 2009. Published February 2009. DOI: Withdrawn. The last approved version of this historical standard is referenced
10.1520/D7504-09. on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D7504 – 09
TABLE 1 Recommended Method Parameters
OSHA Regulations, 29 CFR paragraphs 1910.1000 and
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1910.1200 Inlet Split
Temperature, °C 270
Column:
3. Terminology
Tubing fused silica
Length, m 60
3.1 See Terminology D4790 for definitions of terms used in
Internal diameter, mm 0.32
this test method.
Stationary phase
...
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