ASTM D7266-07e1

Standard Test Method for Analysis of Cyclohexane by Gas Chromatography (External Standard)

SIGNIFICANCE AND USE
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.
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. Calibration of the gas chromatography system is done by the external standard calibration technique.
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 5 to 180 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 E 29.
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. For specific hazard statements, see Section 7.

General Information

• Status: Historical
• Publication Date: 31-Dec-2006
• 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 D7266-07 - Standard Test Method for Analysis of Cyclohexane by Gas Chromatography (External Standard)
• Effective Date: 01-Jan-2007
• Replaced By: ASTM D7266-13 - Standard Test Method for Analysis of Cyclohexane by Gas Chromatography (External Standard)
• Effective Date: 01-Feb-2013
• Referred By: ASTM D5309-22 - Standard Specification for Cyclohexane 999
• Effective Date: 01-Jan-2007

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: D7266 − 07
StandardTest Method for
Analysis of Cyclohexane by Gas Chromatography (External
1
Standard)
This standard is issued under the fixed designation D7266; 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
´ NOTE—Table 2 was corrected editorially in July 2008.
1. Scope D4307 Practice for Preparation of Liquid Blends for Use as
Analytical Standards
1.1 This test method covers the determination of the purity
D4790 Terminology ofAromatic Hydrocarbons and Related
of cyclohexane by gas chromatography. Calibration of the gas
Chemicals
chromatography system is done by the external standard
D6809 Guide for Quality Control and Quality Assurance
calibration technique.
Procedures for Aromatic Hydrocarbons and Related Ma-
1.2 This test method has been found applicable to the
terials
measurement of impurities such as those found in Table 1,
E29 Practice for Using Significant Digits in Test Data to
which are impurities that may be found in cyclohexane. The
Determine Conformance with Specifications
impurities can be analyzed over a range of 5 to 180 mg/kg by
E355 Practice for Gas ChromatographyTerms and Relation-
this method, but may be applicable to a wider range.
ships
E1510 Practice for Installing Fused Silica Open Tubular
1.3 The limit of detection is 1 mg/kg.
Capillary Columns in Gas Chromatographs
1.4 In determining the conformance of the test results using
2.2 Other Document:
this test method to applicable specifications, results shall be
OSHA Regulations, 29 CFR, paragraphs 1910.1000 and
rounded off in accordance with the rounding-off method of
3
1910.1200
Practice E29.
1.5 The values stated in SI units are to be regarded as
3. Terminology
standard. No other units of measurement are included in this
3.1 See Terminology D4790 for definitions of terms used in
standard.
this test method.
1.6 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Summary of Test Method
responsibility of the user of this standard to establish appro-
4.1 Cyclohexane is analyzed using a gas chromatograph
priate safety and health practices and determine the applica-
(GC) equipped with a flame ionization detector (FID). A
bility of regulatory limitations prior to use. For specific hazard
precisely repeatable volume of the sample to be analyzed is
statements, see Section 7.
injected onto the gas chromatograph. The peak areas of the
impurities are measured and converted to concentrations via an
2. Referenced Documents
external standard methodology. Purity by GC (the cyclohexane
2
2.1 ASTM Standards:
content) is calculated by subtracting the sum of the impurities
D3437 Practice for Sampling and Handling Liquid Cyclic
from 100.00. Individual impurities are reported in mg/kg. The
Products
cyclohexane purity is reported in weight percent.
5. Significance and Use
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This test method is under the jurisdiction of ASTM Committee D16 on
5.1 This test method is suitable for setting specifications on
Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of
Subcommittee D16.01 on Benzene, Toluene, Xylenes, Cyclohexane and Their
the materials referenced in Table 1 and for use as an internal
Derivatives.
quality control tool where cyclohexane is produced or is used
Current edition approved Jan. 1, 2007. Published January 2007. DOI: 10.1520/
D7266-07E01.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM AvailablefromU.S.GovernmentPrintingOfficeSuperintendentofDocuments,
Standards volume information, refer to the standard’s Document Summary page on 732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http://
the ASTM website. www.access.gpo.gov.
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D7266 − 07
TABLE 2 Instrumental Parameters
inamanufacturingprocess.Itmayalsobeusedindevelopment
or research work involving cyclohexane. Detector flame ionization
Injection Port capillary splitter
5.2 This test method is useful in determining the purity of
Column A:
Tubing fused silica
cyclohexane with normal impurities present. If extremely high
Stationary phase bonded and crosslinked
boiling or unusual impurities are present in the cyclohexane,
100 % dimethylpolysiloxane†
this test method would not necessarily detect them and the
Film thickness, µm 0.5
Length, m 100
purity calculation would be erroneous.
Diameter, mm 0.25
Temper
...