ASTM D7504-23

Standard Test Method for Trace Impurities in Monocyclic Aromatic Hydrocarbons by Gas Chromatography and Effective Carbon Number

SIGNIFICANCE AND USE
5.1 Determining the type and amount of hydrocarbon impurities remaining from the manufacture of toluene, mixed xylenes, p-xylene, o-xylene, ethylbenzene, benzene, and styrene 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 or more.  
5.2 This method may not detect all components and there may be unknown components that would be assigned inappropriate correction factors and thus, the results may not be absolute.
SCOPE
1.1 This test method covers the determination of total nonaromatic hydrocarbons and monocyclic aromatic hydrocarbons in benzene, toluene, ethylbenzene, p-xylene, o-xylene, styrene and mixed xylenes by gas chromatography. The purity of benzene, toluene, ethylbenzene, p-xylene, o-xylene, styrene and mixed xylenes is also calculated. Similar test methods, using the internal standard calibration technique and the external standard calibration technique, are Test Methods D2360, D5060, D5135, and D5917 respectively.  
1.2 The limit of detection (LOD) is 0.0002 mass % and limit of quantitation (LOQ) is 0.0006 mass % for impurities in toluene, mixed xylenes, p-xylene, o-xylene, ethylbenzene, benzene, and styrene.  
1.3 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.  
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 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

• Status: Published
• Publication Date: 30-Apr-2023
• 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

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: D7504 − 23
Standard Test Method for
Trace Impurities in Monocyclic Aromatic Hydrocarbons by
1
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.
1. Scope* mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
1.1 This test method covers the determination of total
nonaromatic hydrocarbons and monocyclic aromatic hydrocar-
2. Referenced Documents
bons in benzene, toluene, ethylbenzene, p-xylene, o-xylene,
2
2.1 ASTM Standards:
styrene and mixed xylenes by gas chromatography. The purity
D1555M Test Method for Calculation of Volume and Weight
of benzene, toluene, ethylbenzene, p-xylene, o-xylene, styrene
of Industrial Aromatic Hydrocarbons and Cyclohexane
and mixed xylenes is also calculated. Similar test methods,
[Metric]
using the internal standard calibration technique and the
D2360 Test Method for Trace Impurities in Monocyclic
external standard calibration technique, are Test Methods
Aromatic Hydrocarbons by Gas Chromatography (With-
D2360, D5060, D5135, and D5917 respectively.
3
drawn 2016)
1.2 The limit of detection (LOD) is 0.0002 mass % and limit
D3437 Practice for Sampling and Handling Liquid Cyclic
of quantitation (LOQ) is 0.0006 mass % for impurities in
Products
toluene, mixed xylenes, p-xylene, o-xylene, ethylbenzene,
D4790 Terminology of Aromatic Hydrocarbons and Related
benzene, and styrene.
Chemicals
1.3 In determining the conformance of the test results using
D5060 Test Method for Determining Impurities in High-
this method to applicable specifications, results shall be
Purity Ethylbenzene by Gas Chromatography
rounded off in accordance with the rounding-off method of
D5135 Test Method for Analysis of Styrene by Capillary
Practice E29.
Gas Chromatography
D5136 Specification for High Purity p-Xylene
1.4 The values stated in SI units are to be regarded as
D5211 Specification for Xylenes for p-Xylene Feedstock
standard. No other units of measurement are included in this
D5917 Test Method for Trace Impurities in Monocyclic
standard.
Aromatic Hydrocarbons by Gas Chromatography and
1.5 This standard does not purport to address all of the
External Calibration
safety concerns, if any, associated with its use. It is the
D6809 Guide for Quality Control and Quality Assurance
responsibility of the user of this standard to establish appro-
Procedures for Aromatic Hydrocarbons and Related Ma-
priate safety, health, and environmental practices and deter-
terials
mine the applicability of regulatory limitations prior to use.
E29 Practice for Using Significant Digits in Test Data to
1.6 This international standard was developed in accor-
Determine Conformance with Specifications
dance with internationally recognized principles on standard-
E260 Practice for Packed Column Gas Chromatography
ization established in the Decision on Principles for the
E355 Practice for Gas Chromatography Terms and Relation-
Development of International Standards, Guides and Recom-
ships
1
This test method is under the jurisdiction of ASTM Committee D16 on
2
Aromatic, Industrial, Specialty and Related Chemicals and is the direct responsi- For referenced ASTM standards, visit the ASTM website, www.astm.org, or
bility of Subcommittee D16.01 on Benzene, Toluene, Xylenes, Cyclohexane and contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Their Derivatives. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved May 1, 2023. Published May 2023. Originally the ASTM website.
3
approved in 2009. Last previous edition approved in 2021 as D7504 – 21. DOI: The last approved version of this historical standard is referenced on
10.1520/D7504-23. www.astm.org.
*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

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D7504 − 23
TABLE 1 Recommended Method Parameters
E691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method Inlet Split
Temperature, °C 270
E1510 Practice for Installing Fused Silica Open Tubular
Column:
Capillary Columns in Gas Chromatographs
Tubing fused silica
Length, m 60
2.2 Other Document:
Internal diameter, mm 0.32
OSHA Regula
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D7504 − 21 D7504 − 23
Standard Test Method for
Trace Impurities in Monocyclic Aromatic Hydrocarbons by
1
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.
1. Scope*
1.1 This test method covers the determination of total nonaromatic hydrocarbons and monocyclic aromatic hydrocarbons in
benzene, toluene, ethylbenzene, p-xylene, o-xylene, styrene and mixed xylenes by gas chromatography. The purity of benzene,
toluene, ethylbenzene, p-xylene, o-xylene, styrene and mixed xylenes is also calculated. Similar test methods, using the internal
standard calibration technique and the external standard calibration technique, are Test Methods D2360, D3797, D4492, D5060,
D5135, D5917, andand D5917 D6563respectively.
1.2 The limit of detection (LOD) is 0.0002 mass % and limit of quantitation (LOQ) is 0.0006 mass % for impurities in toluene,
mixed xylenes, p-xylene, o-xylene, ethylbenzene, benzene, and styrene.
1.3 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.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.6 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D1555M Test Method for Calculation of Volume and Weight of Industrial Aromatic Hydrocarbons and Cyclohexane [Metric]
3
D2360 Test Method for Trace Impurities in Monocyclic Aromatic Hydrocarbons by Gas Chromatography (Withdrawn 2016)
D3437 Practice for Sampling and Handling Liquid Cyclic Products
3
D3797 Test Method for Analysis of o-Xylene by Gas Chromatography (Withdrawn 2014)
3
D4492 Test Method for Analysis of Benzene by Gas Chromatography (Withdrawn 2018)
1
This test method is under the jurisdiction of ASTM Committee D16 on Aromatic, Industrial, Specialty and Related Chemicals and is the direct responsibility of
Subcommittee D16.01 on Benzene, Toluene, Xylenes, Cyclohexane and Their Derivatives.
Current edition approved July 1, 2021May 1, 2023. Published August 2021May 2023. Originally approved in 2009. Last previous edition approved in 20202021 as
D7504 – 20.D7504 – 21. DOI: 10.1520/D7504-21.10.1520/D7504-23.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
The last approved version of this historical standard is referenced on www.astm.org.
*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 ----------------------
D7504 − 23
D4790 Terminology of Aromatic Hydrocarbons and Related Chemicals
D5060 Test Method for Determining Impurities in High-Purity Ethylbenzene by Gas Chromatography
D5135 Test Method for Analysis of Styrene by Capillary Gas Chromatography
D5136 Specification for High Purity p-Xylene
D5211 Specification for Xylenes for p-Xylene Feedstock
D5917 Test Method for Trace Impurities in Monocyclic Aromatic Hydrocarbons by Gas Chromatography and External
Calibration
3
D6563 Test Method for Benzene, Toluene, Xylene (BTX) Concentrates Analysis by Gas Chromatography (Withdrawn 2018)
D6809 Guide for Quality Control and Quality Assurance Procedures for Aromatic Hydrocarbons and Related Materials
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specificati
...