ASTM D7266 - 13e1

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

    Active Standard ASTM D7266 | Developed by Subcommittee: D16.01

    Book of Standards Volume: 06.04


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    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.

    1. 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 3 to 200 mg/kg by this method, but may be applicable to a wider range.

    TABLE 1 Impurities Known or Suggested to be Present in Commercial Cyclohexane

     C4

    (1) n-butane

    (2) isobutene

     C5

    (3) n-pentane

    (4) isopentane

    (5) cyclopentane

     C6

    (6) n-hexane

    (7) 2-methylpentane

    (8) 3-methylpentane

    (9) methylcyclopentane

    (10) benzene

    (11) cyclohexene

    (12) 2,2-dimethylbutane

    (13) 2,3-dimethylbutane

     C7

    (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) cis-1,3-dimethylcyclopentane

    (25) ethylcyclopentane

    (26) methylcyclohexane

    (27) 3-ethylpentane

    (28) 3-methylhexane

    (29) 2-methylhexane

    (30) n-heptane

    (31) toluene

     C8

    (32) iso-octane

    (33) p-xylene

     C9

    (34) isopropylcylohexane


    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 and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Section 7.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D3437 Practice for Sampling and Handling Liquid Cyclic Products

    D4307 Practice for Preparation of Liquid Blends for Use as Analytical Standards

    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


    ICS Code

    ICS Number Code 71.080.10 (Aliphatic hydrocarbons)

    UNSPSC Code

    UNSPSC Code


    DOI: 10.1520/D7266-13E01

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