ASTM D7871-18

Standard Test Method for Analysis of Cyclohexane by Gas Chromatography (Effective Carbon Number)

SIGNIFICANCE AND USE
5.1 This test method is suitable for setting specifications on the materials referenced in Table 1 and for use as an internal quality control tool where cyclohexane is produced or is used in a manufacturing process. It may also be used in development or research work involving cyclohexane.  
5.2 This test method is useful in determining the purity of cyclohexane with normal impurities present. If extremely high boiling or unusual impurities are present in the cyclohexane, this test method would not necessarily detect them and the purity calculation would be erroneous.
SCOPE
1.1 This test method covers the determination of the purity of cyclohexane by gas chromatography.  
1.2 This test method has been found applicable to the measurement of impurities such as those found in Table 1, which are impurities that may be found in cyclohexane. The impurities can be analyzed over a range of 1 to 400 mg/kg by this method, but may be applicable to a wider range.  
1.3 The limit of detection is 1 mg/kg.  
1.4 In determining the conformance of the test results using this test 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific hazards statements, see Section 8.  
1.7 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: Historical
• Publication Date: 31-Dec-2017
• ICS: 71.080.10 - Aliphatic hydrocarbons
• Technical Committee: D16 - Aromatic, Industrial, Specialty and Related Chemicals
• Drafting Committee: D16.01 - Benzene, Toluene, Xylenes, Cyclohexane and Their Derivatives

Relations

• Replaces: ASTM D7871-13 - Standard Test Method for Analysis of Cyclohexane by Gas Chromatography (Effective Carbon Number)
• Effective Date: 01-Jan-2018
• Referred By: ASTM D5309-22 - Standard Specification for Cyclohexane 999
• Effective Date: 01-Jan-2018

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: D7871 − 18
Standard Test Method for
Analysis of Cyclohexane by Gas Chromatography (Effective
1
Carbon Number)
This standard is issued under the fixed designation D7871; 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
1.1 This test method covers the determination of the purity 2.1 ASTM Standards:
of cyclohexane by gas chromatography. D3437 Practice for Sampling and Handling Liquid Cyclic
Products
1.2 This test method has been found applicable to the
D4790 Terminology ofAromatic Hydrocarbons and Related
measurement of impurities such as those found in Table 1,
Chemicals
which are impurities that may be found in cyclohexane. The
D6809 Guide for Quality Control and Quality Assurance
impurities can be analyzed over a range of 1 to 400 mg/kg by
Procedures for Aromatic Hydrocarbons and Related Ma-
this method, but may be applicable to a wider range.
terials
1.3 The limit of detection is 1 mg/kg.
E29 Practice for Using Significant Digits in Test Data to
1.4 In determining the conformance of the test results using Determine Conformance with Specifications
E355 Practice for Gas Chromatography Terms and Relation-
this test method to applicable specifications, results shall be
rounded off in accordance with the rounding-off method of ships
E691 Practice for Conducting an Interlaboratory Study to
Practice E29.
Determine the Precision of a Test Method
1.5 The values stated in SI units are to be regarded as
E1510 Practice for Installing Fused Silica Open Tubular
standard. No other units of measurement are included in this
Capillary Columns in Gas Chromatographs
standard.
3
2.2 Other Standards:
1.6 This standard does not purport to address all of the
OSHA Regulations, 29 CFR paragraphs 1910.1000 and
safety concerns, if any, associated with its use. It is the
1910.1200
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
3. Terminology
mine the applicability of regulatory limitations prior to use.
3.1 See Terminology D4790 for definitions of terms used in
For specific hazards statements, see Section 8.
this test method.
1.7 This international standard was developed in accor-
dance with internationally recognized principles on standard-
4. Summary of Test Method
ization established in the Decision on Principles for the
4.1 The specimen to be analyzed is injected into a gas
Development of International Standards, Guides and Recom-
chromatographequippedwithaflameionizationdetector(FID)
mendations issued by the World Trade Organization Technical
and a capillary column. The peak area of each component is
Barriers to Trade (TBT) Committee.
1 2
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, Industrial, Specialty and Related Chemicals and is the direct responsi- contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
bility of Subcommittee D16.01 on Benzene, Toluene, Xylenes, Cyclohexane and Standards volume information, refer to the standard’s Document Summary page on
Their Derivatives. the ASTM website.
3
Current edition approved Jan. 1, 2018. Published January 2018. Originally AvailablefromU.S.GovernmentPrintingOfficeSuperintendentofDocuments,
approved in 2013. Last previous edition approved in 2013 as D7871 – 13. DOI: 732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http://
10.1520/D7871-18. www.access.gpo.gov.
*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 ----------------------
D7871 − 18
TABLE 1 Impurities Known or Suggested to be Present in TABLE 2 Instrumental Parameters
Commercial Cyclohexane
Detector flame ionization
Injection Port capillary splitter
C
4
Column A:
(1) n-butane
Tubing fused silica
(2) isobutene
Stationary phase bonded and crosslinked
C
5
100 % dimethylpolysiloxane
(3) n-pentane
Film thickness, µm 0.5
(4) isopentane
Length, m 100
(5) cyclopentane
Diameter, mm 0.25
C
6
Temperatures:
(6) n-hexane
Injector, °C 230
(7) 2-methylpentane
Detector, °C 250
(8) 3-methylpentane
Oven, °C 32 hold for 12 min
(9) methylcyclopentane
Ramp1=8°C/minto64°C,
(10) benzene
hold for 10 min
(11) cyclohexane
Ramp 2 = 10°C/min to 200°C,
(12) 2,2-dimethylbutane
hold for 5 min
(13) 2,3-dimethylbutane
Carrier gas Hydrogen
C
7
Flow rate, mls/min 3
(14) 3,3-dimethylpentane
Split ratio 100:1
(15) 2,2-dimethylpentane
...

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: D7871 − 13 D7871 − 18
Standard Test Method for
Analysis of Cyclohexane by Gas Chromatography (Effective
1
Carbon Number)
This standard is issued under the fixed designation D7871; 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 Scope*
1.1 This test method covers the determination of the purity of cyclohexane by gas chromatography.
1.2 This test method has been found applicable to the measurement of impurities such as those found in Table 1, which are
impurities that may be found in cyclohexane. The impurities can be analyzed over a range of 1 to 400 mg/kg by this method, but
may be applicable to a wider range.
1.3 The limit of detection is 1 mg/kg.
1.4 In determining the conformance of the test results using this test 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use. For specific hazards statements, see Section 8.
1.7 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:
D3437 Practice for Sampling and Handling Liquid Cyclic Products
D4790 Terminology of Aromatic Hydrocarbons and Related Chemicals
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 Specifications
E355 Practice for Gas Chromatography Terms and Relationships
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E1510 Practice for Installing Fused Silica Open Tubular Capillary Columns in Gas Chromatographs
3
2.2 Other Standards:
OSHA Regualtions,Regulations, 29 CFR paragraphs 1910.1000 and 1910.1200
3. Terminology
3.1 See Terminology D4790 for definitions of terms used in this test method.
1
This test method is under the jurisdiction of ASTM Committee D16 on Aromatic Hydrocarbons 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 June 1, 2013Jan. 1, 2018. Published July 2013January 2018. Originally approved in 2013. Last previous edition approved in 2013 as D7871 –
13. DOI: 10.1520/D7871-13.10.1520/D7871-18.
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’sstandard’s Document Summary page on the ASTM website.
3
Available from U.S. Government Printing Office Superintendent of Documents, 732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http://
www.access.gpo.gov.
*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 ----------------------
D7871 − 18
TABLE 1 Impurities Known or Suggested to be Present in
Commercial Cyclohexane
C
4
(1) n-butane
(2) isobutene
C
5
(3) n-pentane
(4) isopentane
(5) cyclopentane
C
6
(6) n-hexane
(7) 2-methylpentane
(8) 3-methylpentane
(9) methylcyclopentane
(10) benzene
(11) cyclohexene
(11) cyclohexane
(12) 2,2-dimethylbutane
(13) 2,3-dimethylbutane
C
7
(14) 3,3-dimethylpentane
(15) 2,2-dimethylpentane
(16) 2,3-dimethylpentane
(17) 2,4-dimethylpentane
(18) 1,1-dimethylcyclopentane
(19) trans-1,3-dimethylcyclopentane
(20) trans-1,2-dimethylcyclopentane
(21) cis-1,2-dimethylcyclopentane
(22) 2,2-dimethylcyclopentane
(23) 2,4-dimethylcyclopentane
(24)
...