ASTM D7504-16

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, D3797, D4492, D5060, D5135, D5917, and D6563 respectively.  
1.2 A small amount of benzene in toluene, ethylbenzene, p-xylene, o-xylene, styrene and mixed xylenes may not be distinguished from the non-aromatics and the concentrations are determined as a composite (see 6.1).  
1.3 The limit of detection (LOD) is 0.0002 wt % and limit of quantitation (LOQ) is 0.0006 wt % for impurities in toluene, mixed xylenes, p-xylene, o-xylene, ethylbenzene, benzene, and styrene.  
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.

General Information

• Status: Historical
• Publication Date: 31-Jul-2016
• 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 D7504-17 - Standard Test Method for Trace Impurities in Monocyclic Aromatic Hydrocarbons by Gas Chromatography and Effective Carbon Number
• Effective Date: 01-Apr-2017

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: D7504 − 16
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* 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 This test method covers the determination of total
D841 Specification for Nitration Grade Toluene
nonaromatic hydrocarbons and monocyclic aromatic hydrocar-
D1555M TestMethodforCalculationofVolumeandWeight
bons in benzene, toluene, ethylbenzene, p-xylene, o-xylene,
of Industrial Aromatic Hydrocarbons and Cyclohexane
styrene and mixed xylenes by gas chromatography. The purity
[Metric]
of benzene, toluene, ethylbenzene, p-xylene, o-xylene, styrene
D2360 Test Method for Trace Impurities in Monocyclic
and mixed xylenes is also calculated. Similar test methods,
Aromatic Hydrocarbons by Gas Chromatography
using the internal standard calibration technique and the
D3437 Practice for Sampling and Handling Liquid Cyclic
external standard calibration technique, are Test Methods
Products
D2360, D3797, D4492, D5060, D5135, D5917, and D6563
D3797 Test Method for Analysis of o-Xylene by Gas Chro-
respectively.
3
matography (Withdrawn 2014)
1.2 A small amount of benzene in toluene, ethylbenzene, D4492 Test Method for Analysis of Benzene by Gas Chro-
matography
p-xylene, o-xylene, styrene and mixed xylenes may not be
distinguished from the non-aromatics and the concentrations D4790 Terminology ofAromatic Hydrocarbons and Related
Chemicals
are determined as a composite (see 6.1).
D5060 Test Method for Determining Impurities in High-
1.3 The limit of detection (LOD) is 0.0002 wt % and limit
Purity Ethylbenzene by Gas Chromatography
of quantitation (LOQ) is 0.0006 wt % for impurities in toluene,
D5135 Test Method for Analysis of Styrene by Capillary
mixedxylenes, p-xylene, o-xylene,ethylbenzene,benzene,and
Gas Chromatography
styrene.
D5136 Specification for High Purity p-Xylene
D5211 Specification for Xylenes for p-Xylene Feedstock
1.4 In determining the conformance of the test results using
D5917 Test Method for Trace Impurities in Monocyclic
this method to applicable specifications, results shall be
Aromatic Hydrocarbons by Gas Chromatography and
rounded off in accordance with the rounding-off method of
External Calibration
Practice E29.
D6229 Test Method for Trace Benzene in Hydrocarbon
1.5 The values stated in SI units are to be regarded as
Solvents by Capillary Gas Chromatography
standard. No other units of measurement are included in this
D6563 Test Method for Benzene, Toluene, Xylene (BTX)
standard. Concentrates Analysis by Gas Chromatography
D6809 Guide for Quality Control and Quality Assurance
1.6 This standard does not purport to address all of the
Procedures for Aromatic Hydrocarbons and Related Ma-
safety concerns, if any, associated with its use. It is the
terials
responsibility of the user of this standard to establish appro-
E29 Practice for Using Significant Digits in Test Data to
priate safety and health practices and determine the applica-
Determine Conformance with Specifications
bility of regulatory limitations prior to use.
E177 Practice for Use of the Terms Precision and Bias in
ASTM Test Methods
1
This test method is under the jurisdiction of ASTM Committee D16 on
2
Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Subcommittee D16.01 on Benzene, Toluene, Xylenes, Cyclohexane and Their contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Derivatives. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Aug. 1, 2016. Published August 2016. Originally the ASTM website.
ɛ1 3
approved in 2009. Last previous edition approved in 2015 as D7504 – 15 . DOI: The last approved version of this historical standard is referenced on
10.1520/D7504-16. 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 − 16
E260 Practice for Packed Column Gas Chromatography alternate method such as Test Method D6229 must be selected
E355 Practice for Gas ChromatographyTerms and Relation- to ensure an accurate assessment of the benzene concentration.
ships
6.2 Thecompleteseparationof p-xylenefromethylbenzene,
E691 Practice for Conducting an I
...

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.
´1
Designation: D7504 − 15 D7504 − 16
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
ε NOTE—Research Report information was added editorially in September 2015.
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, and D6563 respectively.
1.2 A small amount of benzene in toluene, ethylbenzene, p-xylene, o-xylene, styrene and mixed xylenes may not be
distinguished from the non-aromatics and the concentrations are determined as a composite (see 6.1).
1.3 The limit of detection (LOD) is 0.0002 wt % and limit of quantitation (LOQ) is 0.0006 wt % for impurities in toluene, mixed
xylenes, p-xylene, o-xylene, ethylbenzene, benzene, and styrene.
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.
2. Referenced Documents
2
2.1 ASTM Standards:
D841 Specification for Nitration Grade Toluene
D1555M Test Method for Calculation of Volume and Weight of Industrial Aromatic Hydrocarbons and Cyclohexane [Metric]
D2360 Test Method for Trace Impurities in Monocyclic Aromatic Hydrocarbons by Gas Chromatography
D3437 Practice for Sampling and Handling Liquid Cyclic Products
3
D3797 Test Method for Analysis of o-Xylene by Gas Chromatography (Withdrawn 2014)
D4492 Test Method for Analysis of Benzene by Gas Chromatography
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
D6229 Test Method for Trace Benzene in Hydrocarbon Solvents by Capillary Gas Chromatography
1
This test method is under the jurisdiction of ASTM Committee D16 on Aromatic Hydrocarbons 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, 2015Aug. 1, 2016. Published July 2015August 2016. Originally approved in 2009. Last previous edition approved in 20122015 as
ɛ1
D7504 – 12.D7504 – 15 . DOI: 10.1520/D7504-15E01.10.1520/D7504-16.
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 − 16
D6563 Test Method for Benzene, Toluene, Xylene (BTX) Concentrates Analysis by Gas Chromatography
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 Con
...