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  • ISO 6974-1:2012

    Current The latest, up-to-date edition.

    Natural gas — Determination of composition and associated uncertainty by gas chromatography — Part 1: General guidelines and calculation of composition

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    Published date:  15-05-2012

    Publisher:  International Organization for Standardization

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    General Product Information - (Show below) - (Hide below)

    Committee ISO/TC 193/SC 1
    Development Note Together with ISO 6974-2, ISO 6974-3, ISO 6974-4 and ISO 6974-5, it Supersedes ISO 6974:1984 (03/2001) Supersedes ISO/DIS 6974-1. (05/2012)
    Document Type Standard
    Publisher International Organization for Standardization
    Status Current
    Supersedes

    Standards Referenced By This Book - (Show below) - (Hide below)

    BS EN 16726 : 2015 GAS INFRASTRUCTURE - QUALITY OF GAS - GROUP H
    BS EN 16723-2:2017 Natural gas and biomethane for use in transport and biomethane for injection in the natural gas network Automotive fuels specification
    16/30312922 DC : 0 BS ISO 18888 - GAS TURBINE COMBINED CYCLE POWER PLANTS THERMAL PERFORMANCE TESTS
    17/30326671 DC : 0 BS ISO 27919-1 - CARBON DIOXIDE CAPTURE - PART 1: PERFORMANCE EVALUATION METHODS FOR POST-COMBUSTION CO[2] CAPTURE INTEGRATED WITH A POWER PLANT
    14/30296490 DC : 0 BS EN 16723-2 - NATURAL GAS AND BIOMETHANE FOR USE IN TRANSPORT AND BIOMETHANE FOR INJECTION IN THE NATURAL GAS NETWORK - PART 2: AUTOMOTIVE FUEL SPECIFICATIONS
    DIN EN ISO 6974-6 E : 2005 NATURAL GAS - DETERMINATION OF COMPOSITION WITH DEFINED UNCERTAINTY BY GAS CHROMATOGRAPHY - PART 6: DETERMINATION OF HYDROGEN, HELIUM, OXYGEN, NITROGEN, CARBON DIOXIDE AND C[1] TO C[8] HYDROCARBONS USING THREE CAPILLARY COLUMNS
    S.R. CEN ISO/TR 24094:2007 ANALYSIS OF NATURAL GAS - VALIDATION METHODS FOR GASEOUS REFERENCE MATERIALS
    I.S. EN 16723-2:2017 NATURAL GAS AND BIOMETHANE FOR USE IN TRANSPORT AND BIOMETHANE FOR INJECTION IN THE NATURAL GAS NETWORK - PART 2: AUTOMOTIVE FUELS SPECIFICATION
    DIN EN ISO 6974-2 E : 2012 NATURAL GAS - DETERMINATION OF COMPOSITION AND ASSOCIATED UNCERTAINTY BY GAS CHROMATOGRAPHY - PART 2: UNCERTAINTY CALCULATIONS (ISO 6974-2:2012)
    UNE-EN ISO 6974-5:2015 Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 5: Isothermal method for nitrogen, carbon dioxide, C1 to C5 hydrocarbons and C6+ hydrocarbons (ISO 6974-5:2014)
    BS EN ISO 13686:2013 Natural gas. Quality designation
    UNE-EN ISO 14532:2017 Natural gas - Vocabulary (ISO 14532:2014)
    UNE-EN ISO 6976:2017 Natural gas - Calculation of calorific values, density, relative density and Wobbe indices from composition (ISO 6976:2016)
    BS EN ISO 14111:1999 Natural gas. Guidelines to traceability in analysis
    BS EN ISO 6976:2005 Natural gas. Calculation of calorific values, density, relative density and Wobbe index from composition
    I.S. EN ISO 13686:2013 NATURAL GAS - QUALITY DESIGNATION (ISO 13686:2013)
    EN 12405-2:2012 Gas meters - Conversion devices - Part 2: Energy conversion
    DIN EN 16723-2:2017-10 NATURAL GAS AND BIOMETHANE FOR USE IN TRANSPORT AND BIOMETHANE FOR INJECTION IN THE NATURAL GAS NETWORK - PART 2: AUTOMOTIVE FUELS SPECIFICATION
    BS EN ISO 6974-6:2008 Natural gas. Determination of composition with defined uncertainty by gas chromatography Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and C1 to C8 hydrocarbons using three capillary columns
    PD ISO/TR 29922:2017 Natural gas. Supporting information on the calculation of physical properties according to ISO 6976
    DIN EN 16723-2:2014-06 (Draft) NATURAL GAS AND BIOMETHANE FOR USE IN TRANSPORT AND BIOMETHANE FOR INJECTION IN THE NATURAL GAS NETWORK - PART 2: AUTOMOTIVE FUELS SPECIFICATION
    10/30203803 DC : 0 BS ISO 6974-2 - NATURAL GAS - DETERMINATION OF COMPOSITION AND ASSOCIATED UNCERTAINTY BY GAS CHROMATOGRAPHY - PART 2: UNCERTAINTY CALCULATIONS
    ISO 18453:2004 Natural gas — Correlation between water content and water dew point
    PD CEN ISO/TR 24094:2007 Analysis of natural gas. Validation methods for gaseous reference materials
    05/30068455 DC : DRAFT MAY 2005 ISO 23874 - NATURAL GAS - ANALYTICAL REQUIREMENTS FOR HYDROCARBON CONTENT/DEW POINT CALCULATION
    BS EN ISO 18453:2005 Natural gas. Correlation between water content and water dew point
    I.S. EN 12405-2:2012 GAS METERS - CONVERSION DEVICES - PART 2: ENERGY CONVERSION
    I.S. EN 16726:2015 GAS INFRASTRUCTURE - QUALITY OF GAS - GROUP H
    DIN EN ISO 6974-2:2012-11 Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 2: Uncertainty calculations (ISO 6974-2:2012)
    UNE-EN ISO 13686:2014 Natural gas - Quality designation (ISO 13686:2013)
    BS EN ISO 14532:2017 Natural gas. Vocabulary
    I.S. EN ISO 10723:2012 NATURAL GAS - PERFORMANCE EVALUATION FOR ANALYTICAL SYSTEMS (ISO 10723:2012)
    I.S. EN ISO 6974-2:2012 NATURAL GAS - DETERMINATION OF COMPOSITION AND ASSOCIATED UNCERTAINTY BY GAS CHROMATOGRAPHY - PART 2: UNCERTAINTY CALCULATIONS (ISO 6974-2:2012)
    DIN EN ISO 10723:2013-04 NATURAL GAS - PERFORMANCE EVALUATION FOR ANALYTICAL SYSTEMS (ISO 10723:2012)
    I.S. EN ISO 6976:2016 NATURAL GAS - CALCULATION OF CALORIFIC VALUES, DENSITY, RELATIVE DENSITY AND WOBBE INDICES FROM COMPOSITION (ISO 6976:2016)
    I.S. EN ISO 14532:2017 NATURAL GAS - VOCABULARY (ISO 14532:2014)
    I.S. EN ISO 6974-5:2014 NATURAL GAS - DETERMINATION OF COMPOSITION AND ASSOCIATED UNCERTAINTY BY GAS CHROMATOGRAPHY - PART 5: ISOTHERMAL METHOD FOR NITROGEN, CARBON DIOXIDE, C[1] TO C[5] HYDROCARBONS AND C[6+] HYDROCARBONS (ISO 6974-5:2014)
    BS 3156-11.1.2(1997) : 1997 AMD 16104 ANALYSIS OF FUEL GASES - METHODS FOR NON-MANUFACTURED GASES - HYDROCARBONS AND INERT GASES - EXTENDED ANALYSIS BY GAS CHROMATOGRAPHIC METHOD
    11/30232917 DC : 0 BS ISO 13579-1 - INDUSTRIAL FURNACES AND ASSOCIATED PROCESSING EQUIPMENT - METHOD OF MEASURING ENERGY BALANCE AND CALCULATING EFFICIENCY - PART 1: GENERAL METHODOLOGY
    UNI EN 12405-2 : 2012 GAS METERS - CONVERSION DEVICES - PART 2: ENERGY CONVERSION
    BS ISO 14532 : 2001 AMD 15911 NATURAL GAS - VOCABULARY
    BS EN 12405-2:2012 Gas meters. Conversion devices Energy conversion
    04/30122896 DC : DRAFT SEP 2004 ISO 15112 - NATURAL GAS - ENERGY DETERMINATION
    14/30296487 DC : 0 BS EN 16723-1 - NATURAL GAS AND BIOMETHANE FOR USE IN TRANSPORT AND BIOMETHANE FOR INJECTION IN THE NATURAL GAS NETWORK - PART 1: SPECIFICATIONS FOR BIOMETHANE FOR INJECTION IN THE NATURAL GAS NETWORK
    DIN EN ISO 6974-3 E : 2002 NATURAL GAS - DETERMINATION OF COMPOSITION WITH DEFINED UNCERTAINTY BY GAS CHROMATOGRAPHY - PART 3: DETERMINATION OF HYDROGEN, HELIUM, OXYGEN, NITROGEN, CARBON DIOXIDE AND HYDROCARBONS UP TO C[8] USING TWO PACKED COLUMNS
    12/30264449 DC : DRAFT JULY 2012 BS EN ISO 6974-5 - NATURAL GAS - DETERMINATION OF COMPOSITION AND ASSOCIATED UNCERTAINTY BY GAS CHROMATOGRAPHY - ISOTHERMAL METHOD FOR NITROGEN, CARBON DIOXIDE, C1 TO C5 HYDROCARBONS AND C6+ HYDROCARBONS
    ISO/TR 24094:2006 Analysis of natural gas Validation methods for gaseous reference materials
    I.S. EN ISO 6974-3:2002 NATURAL GAS - DETERMINATION OF COMPOSITION WITH DEFINED UNCERTAINTY BY GAS CHROMATOGRAPHY - PART 3: DETERMINATION OF HYDROGEN, HELIUM, OXYGEN, NITROGEN, CARBON DIOXIDE AND HYDROCARBONS UP TO C[8] USING TWO PACKED COLUMNS
    DIN EN ISO 6975:2005-09 NATURAL GAS - EXTENDED ANALYSIS - GAS-CHROMATOGRAPHIC METHOD
    UNE-EN ISO 6974-2:2013 Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 2: Uncertainty calculations (ISO 6974-2:2012)
    BS EN ISO 6974-5:2014 Natural gas. Determination of composition and associated uncertainty by gas chromatography Isothermal method for nitrogen, carbon dioxide, C1 to C5 hydrocarbons and C6+ hydrocarbons
    EN ISO 6974-3:2001 Natural gas - Determination of composition with defined uncertainty by gas chromatography - Part 3: Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and hydrocarbons up to C8 using two packed columns (ISO 6974-3:2000)
    EN ISO 6974-6:2005 Natural gas - Determination of composition with defined uncertainty by gas chromatography - Part 6: Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and C1 to C8 hydrocarbons using three capillary columns (ISO 6974-6:2002)
    EN ISO 6974-2:2012 Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 2: Uncertainty calculations (ISO 6974-2:2012)
    EN ISO 14532:2017 Natural gas - Vocabulary (ISO 14532:2014)
    UNI EN ISO 13686 : 2013 NATURAL GAS - QUALITY DESIGNATION
    UNI EN ISO 6974-2 : 2012 NATURAL GAS - DETERMINATION OF COMPOSITION AND ASSOCIATED UNCERTAINTY BY GAS CHROMATOGRAPHY - PART 2: UNCERTAINTY CALCULATIONS
    UNI EN ISO 10723 : 2013 NATURAL GAS - PERFORMANCE EVALUATION FOR ANALYTICAL SYSTEMS
    DIN EN 16726 E : 2016 GAS INFRASTRUCTURE - QUALITY OF GAS - GROUP H
    17/30345272 DC : 0 BS ISO 14167 - GAS ANALYSIS - GENERAL QUALITY ASPECTS AND METROLOGICAL TRACEABILITY OF CALIBRATION GAS MIXTURES
    ISO 18888:2017 Gas turbine combined cycle power plants — Thermal performance tests
    BS ISO 6974-6 : 2002 NATURAL GAS - DETERMINATION OF COMPOSITION WITH DEFINED UNCERTAINTY BY GAS CHROMATOGRAPHY - DETERMINATION OF HYDROGEN, HELIUM, OXYGEN, NITROGEN, CARBON DIOXIDE AND C[1] TO C[8] HYDROCARBONS USING THREE CAPILLARY COLUMNS
    DIN EN 16723-2 E : 2017 NATURAL GAS AND BIOMETHANE FOR USE IN TRANSPORT AND BIOMETHANE FOR INJECTION IN THE NATURAL GAS NETWORK - PART 2: AUTOMOTIVE FUELS SPECIFICATION
    ISO 6974-3:2000 Natural gas Determination of composition with defined uncertainty by gas chromatography Part 3: Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and hydrocarbons up to C8 using two packed columns
    BS ISO 2314:2009 Gas turbines. Acceptance tests
    17/30345263 DC : 0 BS EN ISO 6974-3 - NATURAL GAS - DETERMINATION OF COMPOSITION AND ASSOCIATED UNCERTAINTY BY GAS CHROMATOGRAPHY - PART 3: PRECISION AND BIAS
    BS ISO 6974-3 : 2000 AMD 13862 NATURAL GAS - DETERMINATION OF COMPOSITION WITH DEFINED UNCERTAINTY BY GAS CHROMATOGRAPHY - PART 3: DETERMINATION OF HYDROGEN, HELIUM, OXYGEN, NITROGEN, CARBON DIOXIDE AND HYDROCARBONS UP TO C8 USING TWO PACKED COLUMNS
    BS ISO 6974-5 : 2000 AMD 13863 NATURAL GAS - DETERMINATION OF COMPOSITION WITH DEFINED UNCERTAINTY BY GAS CHROMATOGRAPHY - PART 5: DETERMINATION OF NITROGEN, CARBON DIOXIDE AND C1 TO C5 AND C6+ HYDROCARBONS FOR A LABORATORY AND ON-LINE PROCESS APPLICATION USING THREE COLUMNS
    ISO 2314:2009 Gas turbines — Acceptance tests
    DIN EN 16726:2016-04 GAS INFRASTRUCTURE - QUALITY OF GAS - GROUP H
    DIN EN ISO 13686:2013-12 NATURAL GAS - QUALITY DESIGNATION (ISO 13686:2013)
    BS EN ISO 6974-4:2001 Natural gas. Determination of composition with defined uncertainty by gas chromatography Determination of nitrogen, carbon dioxide and C1 to C5 and C6+ hydrocarbons for a laboratory and on-line measuring system using two columns
    BS EN ISO 6974-2:2012 Natural gas. Determination of composition and associated uncertainty by gas chromatography Uncertainty calculations
    ISO 6976:2016 Natural gas — Calculation of calorific values, density, relative density and Wobbe indices from composition
    ISO 6974-6:2002 Natural gas Determination of composition with defined uncertainty by gas chromatography Part 6: Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and C1 to C8 hydrocarbons using three capillary columns
    UNE-EN ISO 10723:2013 Natural gas - Performance evaluation for analytical systems (ISO 10723:2012)
    ISO 15403:2000 Natural gas Designation of the quality of natural gas for use as a compressed fuel for vehicles
    ISO 10723:2012 Natural gas Performance evaluation for analytical systems
    ISO 6974-2:2012 Natural gas — Determination of composition and associated uncertainty by gas chromatography — Part 2: Uncertainty calculations
    ISO 14532:2014 Natural gas — Vocabulary
    ISO 6974-4:2000 Natural gas — Determination of composition with defined uncertainty by gas chromatography — Part 4: Determination of nitrogen, carbon dioxide and C1 to C5 and C6+ hydrocarbons for a laboratory and on-line measuring system using two columns
    DIN EN ISO 6974-5:2014-10 NATURAL GAS - DETERMINATION OF COMPOSITION AND ASSOCIATED UNCERTAINTY BY GAS CHROMATOGRAPHY - PART 5: ISOTHERMAL METHOD FOR NITROGEN, CARBON DIOXIDE, C[1] TO C[5] HYDROCARBONS AND C[6+] HYDROCARBONS (ISO 6974-5:2014)
    BS EN ISO 10723:2012 Natural gas. Performance evaluation for analytical systems
    ISO 6975:1997 Natural gas — Extended analysis — Gas-chromatographic method
    ISO 6974-5:2014 Natural gas Determination of composition and associated uncertainty by gas chromatography Part 5: Isothermal method for nitrogen, carbon dioxide, C1 to C5 hydrocarbons and C6+ hydrocarbons
    EN ISO 13686:2013 Natural gas - Quality designation (ISO 13686:2013)
    EN ISO 6974-4:2001 Natural gas - Determination of composition with defined uncertainty by gas chromatography - Part 4: Determination of nitrogen, carbon dioxide and C1 to C5 and C6+ hydrocarbons for a laboratory and on-line measuring system using two columns (ISO 6974-4:2000)
    EN ISO 18453:2005 Natural gas - Correlation between water content and water dew point (ISO 18453:2004)
    EN 16723-2:2017 Natural gas and biomethane for use in transport and biomethane for injection in the natural gas network - Part 2: Automotive fuels specification
    EN ISO 6975:2005 Natural gas - Extended analysis - Gas-chromatographic method (ISO 6975:1997)
    EN ISO 14111:1999 Natural gas - Guidelines to traceability in analysis (ISO 14111:1997)
    EN ISO 6974-5:2014 Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 5: Isothermal method for nitrogen, carbon dioxide, C1 to C5 hydrocarbons and C6+ hydrocarbons (ISO 6974-5:2014)
    EN ISO 6976:2016 Natural gas - Calculation of calorific values, density, relative density and Wobbe indices from composition (ISO 6976:2016)
    EN ISO 10723:2012 Natural gas - Performance evaluation for analytical systems (ISO 10723:2012)
    EN 16726:2015 Gas infrastructure - Quality of gas - Group H
    CEN ISO/TR 24094:2007 Analysis of natural gas - Validation methods for gaseous reference materials (ISO/TR 24094:2006)
    BS EN ISO 6974-3:2001 Natural gas. Determination of composition with defined uncertainty by gas chromatography Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and hydrocarbons up to C8 using two packed columns
    BS ISO 23874 : 2006 NATURAL GAS - GAS CHROMATOGRAPHIC REQUIREMENTS FOR HYDROCARBON DEWPOINT CALCULATION
    15/30289053 DC : 0 BS ISO 6976 - NATURAL GAS - CALCULATION OF CALORIFIC VALUES, DENSITY, RELATIVE DENSITY AND WOBBE INDEX FROM COMPOSITION
    DIN EN 12405-2:2012-10 GAS METERS - CONVERSION DEVICES - PART 2: ENERGY CONVERSION
    12/30247157 DC : 0 BS ISO 14532 - NATURAL GAS - VOCABULARY
    BS ISO 18888:2017 Gas turbine combined cycle power plants. Thermal performance tests
    BS ISO 6974-4 : 2000 AMD 13838 NATURAL GAS - DETERMINATION OF COMPOSITION WITH DEFINED UNCERTAINTY BY GAS CHROMATOGRAPHY - PART 4: DETERMINATION OF NITROGEN, CARBON DIOXIDE AND C1 TO C5 AND C6+ HYDROCARBONS FOR A LABORATORY AND ON-LINE MEASURING SYSTEM USING TWO COLUMNS
    UNE-EN 12405-2:2013 Gas meters - Conversion devices - Part 2: Energy conversion
    BS ISO 6974-2 : 2001 AMD 13855 NATURAL GAS - DETERMINATION OF COMPOSITION WITH DEFINED UNCERTAINTY BY GAS CHROMATOGRAPHY - PART 2: MEASURING-SYSTEM CHARACTERISTICS AND STATISTICS FOR PROCESSING OF DATA
    DIN EN ISO 18453:2006-01 Natural gas - Correlation between water content and water dew point (ISO 18453:2004)
    ISO/TR 29922:2017 Natural gas Supporting information on the calculation of physical properties according to ISO 6976
    ISO 23874:2006 Natural gas Gas chromatographic requirements for hydrocarbon dewpoint calculation
    I.S. EN ISO 6974-6:2005 NATURAL GAS - DETERMINATION OF COMPOSITION WITH DEFINED UNCERTAINTY BY GAS CHROMATOGRAPHY - PART 6: DETERMINATION OF HYDROGEN, HELIUM, OXYGEN, NITROGEN, CARBON DIOXIDE AND C[1] TO C[8] HYDROCARBONS USING THREE CAPILLARY COLUMNS
    I.S. EN ISO 18453:2005 NATURAL GAS - CORRELATION BETWEEN WATER CONTENT AND WATER DEW POINT
    DIN EN ISO 6974-5 E : 2002 NATURAL GAS - DETERMINATION OF COMPOSITION AND ASSOCIATED UNCERTAINTY BY GAS CHROMATOGRAPHY - PART 5: ISOTHERMAL METHOD FOR NITROGEN, CARBON DIOXIDE, C[1] TO C[5] HYDROCARBONS AND C[6+] HYDROCARBONS (ISO 6974-5:2014)
    ISO 13686:2013 Natural gas Quality designation
    BS EN ISO 6975:2005 Natural gas. Extended analysis. Gas chromatographic method
    DIN EN ISO 6974-6:2005-08 Natural gas - Determination of composition with defined uncertainty by gas chromatography - Part 6: Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and C<(Index)1> to C<(Index)8> hydrocarbons using three capillary columns (ISO 6974-6:2002)
    DIN EN ISO 6974-5:2002-06 NATURAL GAS - DETERMINATION OF COMPOSITION AND ASSOCIATED UNCERTAINTY BY GAS CHROMATOGRAPHY - PART 5: ISOTHERMAL METHOD FOR NITROGEN, CARBON DIOXIDE, C[1] TO C[5] HYDROCARBONS AND C[6+] HYDROCARBONS (ISO 6974-5:2014)
    ASME PTC46 : 2015 PERFORMANCE TEST CODES - OVERALL PLANT PERFORMANCE

    Standards Referencing This Book - (Show below) - (Hide below)

    ISO 5725-1:1994 Accuracy (trueness and precision) of measurement methods and results — Part 1: General principles and definitions
    ISO 10715:1997 Natural gas — Sampling guidelines
    ISO 6974-6:2002 Natural gas Determination of composition with defined uncertainty by gas chromatography Part 6: Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and C1 to C8 hydrocarbons using three capillary columns
    ISO 6974-2:2012 Natural gas — Determination of composition and associated uncertainty by gas chromatography — Part 2: Uncertainty calculations
    ISO 6974-4:2000 Natural gas — Determination of composition with defined uncertainty by gas chromatography — Part 4: Determination of nitrogen, carbon dioxide and C1 to C5 and C6+ hydrocarbons for a laboratory and on-line measuring system using two columns
    ISO 10723:2012 Natural gas Performance evaluation for analytical systems
    ISO 16664:2017 Gas analysis — Handling of calibration gases and gas mixtures — Guidelines
    ISO 6974-3:2000 Natural gas Determination of composition with defined uncertainty by gas chromatography Part 3: Determination of hydrogen, helium, oxygen, nitrogen, carbon dioxide and hydrocarbons up to C8 using two packed columns
    ISO Guide 35:2017 Reference materials Guidance for characterization and assessment of homogeneity and stability
    ISO/IEC Guide 99:2007 International vocabulary of metrology Basic and general concepts and associated terms (VIM)
    ISO 6143:2001 Gas analysis — Comparison methods for determining and checking the composition of calibration gas mixtures
    ISO 6142:2001 Gas analysis Preparation of calibration gas mixtures Gravimetric method
    ISO 5725-2:1994 Accuracy (trueness and precision) of measurement methods and results Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method
    ISO 5479:1997 Statistical interpretation of data — Tests for departure from the normal distribution
    ISO Guide 31:2015 Reference materials — Contents of certificates, labels and accompanying documentation
    ISO 6974-5:2014 Natural gas Determination of composition and associated uncertainty by gas chromatography Part 5: Isothermal method for nitrogen, carbon dioxide, C1 to C5 hydrocarbons and C6+ hydrocarbons
    ISO Guide 34:2009 General requirements for the competence of reference material producers
    ISO/IEC Guide 98-3:2008 Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in measurement (GUM:1995)
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