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    ASTM D7994 - 17

    Standard Test Method for Total Fluorine, Chlorine, and Sulfur in Liquid Petroleum Gas (LPG) by Oxidative Pyrohydrolytic Combustion Followed by Ion Chromatography Detection (Combustion Ion Chromatography-CIC)

    Active Standard ASTM D7994 | Developed by Subcommittee: D02.H0

    Book of Standards Volume: 05.04

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    Significance and Use

    5.1 The total fluorine, chlorine, and sulfur contained in LPG, similar low molecular weight hydrocarbons, and DME can be harmful to many catalytic chemical processes, lead to corrosion, and contribute to pollutant emissions. While LPG specifications limit sulfur, some specifications also contain precautionary statements about fluorine. Chlorine has been known to contaminate LPG with detrimental consequences. This test method can be used to determine total fluorine (as fluoride), chlorine (as chloride), and sulfur (as sulfate ion) in process streams, intermediate and finished LPG products, similar low molecular weight hydrocarbons, and DME (1.1).

    1. Scope

    1.1 This test method covers the individual determination of total fluorine, chlorine, and sulfur in liquid petroleum gas (LPG), low molecular weight hydrocarbons, their mixtures, and dimethyl ether (DME) in the range of 1 mg/kg to 300 mg/kg fluorine and sulfur and 5 mg/kg to 300 mg/kg for chlorine. This test method is applicable to products described in Specifications D1835 and D7901 and it can be applicable to process streams with similar properties to LPG and other materials such as butylene, propylene, and olefins.

    1.2 This test method can also be applied to the measurement of the bromine and iodine in samples covered by the scope of this test method, but the precision and bias statement of this test method is not applicable to these halides.

    1.3 This test method can be applied to sample concentrations outside the scope of this test method through adjustments of sample injection volume or number of injections combusted (or both), adjustment of injection volume to the ion chromatograph, and adjustment of the final dilution volume of the absorbing solution prior to injection to the ion chromatograph. The precision and scope of this test method is not applicable to samples that are outside the scope of the method.

    1.4 The values stated in SI units are to be regarded as standard.

    1.4.1 Exception—Values given in parentheses are for information only.

    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 and health practices and determine the applicability of regulatory limitations prior to use. See Section 9.

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

    ASTM Standards

    D1193 Specification for Reagent Water

    D1265 Practice for Sampling Liquefied Petroleum (LP) Gases, Manual Method

    D1835 Specification for Liquefied Petroleum (LP) Gases

    D3700 Practice for Obtaining LPG Samples Using a Floating Piston Cylinder

    D6849 Practice for Storage and Use of Liquefied Petroleum Gases (LPG) in Sample Cylinders for LPG Test Methods

    D7901 Specification for Dimethyl Ether for Fuel Purposes

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

    E288 Specification for Laboratory Glass Volumetric Flasks

    E969 Specification for Glass Volumetric (Transfer) Pipets

    OSHA Standards

    29 CFR Part 1910.1200

    ICS Code

    ICS Number Code 75.160.30 (Gaseous fuels)

    UNSPSC Code

    UNSPSC Code 15111510(Liquified petroleum gas)

    Referencing This Standard
    Link Here
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    DOI: 10.1520/D7994-17

    Citation Format

    ASTM D7994-17, Standard Test Method for Total Fluorine, Chlorine, and Sulfur in Liquid Petroleum Gas (LPG) by Oxidative Pyrohydrolytic Combustion Followed by Ion Chromatography Detection (Combustion Ion Chromatography-CIC), ASTM International, West Conshohocken, PA, 2017, www.astm.org

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