ISO 7941:1988

Name: ISO 7941:1988 — Commercial propane and butane — Analysis by gas chromatography
SKU: ISO 7941:1988
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Commercial propane and butane — Analysis by gas chromatography

Название (английский):

ISO 7941:1988

Commercial propane and butane — Analysis by gas chromatography

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 12
Дата публикации:: 28 июля 1988 г.
Издание:: ISO IS 7941 edition 1 version 1
ICS:: 75.160.30

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Описание (английский):

The method specified applies to the quantitative determination of hydrocarbons in liquefied petroleum gas, excluding components whose concentrations are below O,1 % (m/m). It is applicable to the analysis of propane, butane and their commercial mixtures which may include saturated and unsaturated C2, C3, C4 and C5 hydrocarbons. It does not apply to "on-line" chromatography.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO 7941:1988 - "Commercial propane and butane - Analysis by gas chromatography" specifies a laboratory gas chromatographic method for the quantitative determination of hydrocarbons in liquefied petroleum gas (LPG). The method applies to commercial propane, commercial butane and their mixtures containing C2–C5 saturated and unsaturated hydrocarbons. It excludes components present at concentrations below 0.1% (m/m) and is not intended for on‑line chromatography.

Key topics and technical requirements

Scope and limits

Quantitative analysis of propane, butane and associated C2–C5 hydrocarbons.
Components below 0.1% (m/m) are excluded.
Not suitable for on‑line GC systems.

Sampling and safety

References ISO 4257 for LPG sampling procedures.
Safety warnings for LPG handling: risk of cold burns, static discharge (earthing recommended) and specific precautions when using hydrogen carrier gas.

Chromatographic principle

Physical separation on packed columns with identification by reference mixtures or relative retention times.
Quantitation by internal normalization with peak area correction factors.

Recommended columns and stationary phases

Examples in the standard: packed columns with di‑n‑butyl maleate + PP′‑oxy‑dipropionitrile or sebaconitrile (1,8‑dicyano‑octane) on Chromosorb P support.
Typical column lengths and packings are specified (e.g., 8 m + 3 m combinations or 6 m alternatives).

Detectors and sensitivity

Acceptable detectors: flame ionization detector (FID) or thermal conductivity detector (TCD) (hot‑wire or thermistor types).
System must reliably detect and quantify components at the 0.1% level with acceptable signal‑to‑noise and linearity.

Injection and analysis parameters

Liquid injection preferred: 0.5–1 µL; gaseous injection up to 0.5 mL.
Oven, injection port and detector temperature ranges, resolution requirements between critical pairs (e.g., propane/propene, propene/isobutane) and conditioning procedures are provided.

Applications and who uses it

Analytical chemistry and quality control laboratories analyzing LPG composition.

LPG producers, distributors and regulators performing specification testing and batch verification.

Instrument manufacturers and method developers validating packed‑column GC methods for hydrocarbon mixtures.

Safety and compliance teams requiring standardized test methods for commercial propane and butane.

Related standards

ISO 4257 - Liquefied Petroleum gases - Method of sampling.

ISO 565 - Test sieves (relevant to packing particle size).

Users should refer to the latest editions of referenced standards for up‑to‑date procedures.

Keywords: ISO 7941:1988, commercial propane and butane, LPG analysis, gas chromatography, FID, thermal conductivity detector, packed column, internal normalization.

ISO 7941:1988

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and who uses it

Related standards

Технические детали

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