ASTM D7011-15(2019)
(Test Method)Standard Test Method for Determination of Trace Thiophene in Refined Benzene by Gas Chromatography and Sulfur Selective Detection
Standard Test Method for Determination of Trace Thiophene in Refined Benzene by Gas Chromatography and Sulfur Selective Detection
SIGNIFICANCE AND USE
4.1 Accurate gas chromatographic determination of trace levels of thiophene in benzene involves special analytical problems because of the difficulties of trace level analysis. These problems arise from the low concentration levels that need to be measured, the type of column and detector needed for analysis, and the potential interference from the benzene matrix.
4.2 This test method was found applicable for determining thiophene in refined benzene conforming to the specifications described in Specifications D2359, D4734, and D5871 and may be applicable toward other grades of benzene if the user has taken the necessary precautions as described in the text.
4.3 This test method was developed as an alternative technique to Test Method D4735.
SCOPE
1.1 This test method covers the determination of thiophene in refined benzene using gas chromatography and sulfur selective detection. The test method is applicable to the determination of thiophene at levels of 0.02 to 2.18 mg thiophene per kg in benzene (mg/kg) on the AED, 0.03 to 1.87 mg/kg on the PFPD, and 0.03 to 2.11 mg/kg on the SCD. The range of the test method may be extended by modifying the sample injection volume, split ratios, calibration range, or sample dilution with thiophene-free solvent.
1.2 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.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Section 7.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D7011 −15 (Reapproved 2019)
Standard Test Method for
Determination of Trace Thiophene in Refined Benzene by
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Gas Chromatography and Sulfur Selective Detection
This standard is issued under the fixed designation D7011; 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 D2359 Specification for Refined Benzene-535
D3437 Practice for Sampling and Handling Liquid Cyclic
1.1 This test method covers the determination of thiophene
Products
in refined benzene using gas chromatography and sulfur
D4734 Specification for Refined Benzene-545
selective detection. The test method is applicable to the
D4735 Test Method for Determination of Trace Thiophene
determination of thiophene at levels of 0.02 to 2.18 mg
in Refined Benzene by Gas Chromatography
thiophene per kg in benzene (mg/kg) on theAED, 0.03 to 1.87
D5871 Specification for Benzene for Cyclohexane Feed-
mg/kg on the PFPD, and 0.03 to 2.11 mg/kg on the SCD. The
stock
range of the test method may be extended by modifying the
D6809 Guide for Quality Control and Quality Assurance
sample injection volume, split ratios, calibration range, or
Procedures for Aromatic Hydrocarbons and Related Ma-
sample dilution with thiophene-free solvent.
terials
1.2 In determining the conformance of the test results using
E29 Practice for Using Significant Digits in Test Data to
this method to applicable specifications, results shall be
Determine Conformance with Specifications
rounded off in accordance with the rounding-off method of
E177 Practice for Use of the Terms Precision and Bias in
Practice E29.
ASTM Test Methods
1.3 The values stated in SI units are to be regarded as
E691 Practice for Conducting an Interlaboratory Study to
standard. No other units of measurement are included in this
Determine the Precision of a Test Method
standard.
E1510 Practice for Installing Fused Silica Open Tubular
Capillary Columns in Gas Chromatographs
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
2.2 Other Document:
responsibility of the user of this standard to establish appro-
OSHA Regulations, 29 CFR paragraphs 1910.1000 and
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priate safety, health, and environmental practices and deter-
1910.1200
mine the applicability of regulatory limitations prior to use.
For specific hazard statements, see Section 7.
3. Summary of Test Method
1.5 This international standard was developed in accor-
3.1 The thiophene concentration in refined benzene is de-
dance with internationally recognized principles on standard-
termined at the sub-mg/kg to low mg/kg level using conven-
ization established in the Decision on Principles for the
tional gas chromatography with a sulfur selective detector. A
Development of International Standards, Guides and Recom-
reproducible volume of sample is injected. Quantitative results
mendations issued by the World Trade Organization Technical
are obtained by the use of the external standard calibration
Barriers to Trade (TBT) Committee.
technique.
2. Referenced Documents
3.2 The method allows the use of a sulfur chemilumines-
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2.1 ASTM Standards:
cence detector, atomic emission detector, pulsed flame photo-
D1193 Specification for Reagent Water
metric detector, or any other sulfur selective detector provided
that its performance meets requirements as set forth in 5.4.As
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This test method is under the jurisdiction of ASTM Committee D16 on
sulfur compounds elute from the gas chromatographic column,
Aromatic, Industrial, Specialty and Related Chemicals and is the direct responsi-
they are detected and quantified. While the benzene molecule
bility of Subcommittee D16.04 on Instrumental Analysis.
does not contain any sulfur atoms, the possibility of matrix
Current edition approved June 1, 2019. Published June 2019. Originally
approved in 2004. Last previous edition approved in 2015 as D7011 – 15. DOI:
10.1520/D7011-15R19.
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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,
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the ASTM website. www.access.gpo.gov.
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