ISO 5279-1980 PDF

Full title and description

ISO 5279:1980 — Toluene — Determination of hydrocarbon impurities — Gas chromatographic method. Method for the quantitative determination of low-level hydrocarbon impurities (including benzene, C8 aromatics and aliphatics up to n‑nonane) in toluene using gas chromatography with an internal standard and flame ionization detection.

Abstract

This International Standard specifies a gas‑chromatographic procedure for determining hydrocarbon impurities in toluene in the concentration range 0.01 % (m/m) to 1.00 % (m/m). A known amount of an internal standard is added to a test portion; an aliquot is injected onto a separating column, components are swept through by carrier gas, detected by a flame ionization detector (FID) and recorded as peaks. Identification is by relative retention times and quantification from peak area ratios relative to the internal standard. The standard was published in 1980 and later withdrawn.

General information

• Status: Withdrawn (withdrawal recorded 11 March 2019)
• Publication date: 1 October 1980
• Publisher: International Organization for Standardization (ISO)
• ICS / categories: 71.080.15
• Edition / version: Edition 1 (1980)
• Number of pages: 4

Scope

Applies to the quantitative determination in toluene of benzene, C8 aromatics and aliphatics up to n‑nonane at mass fractions between 0.01 % and 1.00 %. The procedure describes sample preparation (addition of an internal standard), chromatographic separation and detection by FID, identification by relative retention times and calculation of impurity content from peak area ratios. The method is intended for quality control and analytical verification of solvent purity; equivalent alternative chromatographic techniques may be used if they provide equivalent results.

Key topics and requirements

• Scope and analytes: benzene, C8 aromatics and aliphatics up to n‑nonane in toluene (0.01–1.00 % m/m).
• Sample preparation: addition of a known amount of internal standard to test portions.
• Chromatographic technique: gas chromatography with appropriate separating column and carrier gas flow.
• Detection: flame ionization detector (FID) and peak recording.
• Identification: components identified by relative retention times versus standards.
• Quantification: calculation from ratios of peak areas to the internal standard; calibration and response-factor considerations.
• Performance expectations: method detection range and reporting limits consistent with the stated 0.01–1.00 % (m/m) interval.
• Reporting and interpretation: how results are expressed (mass fraction) and treatment of non‑detected impurities.

Typical use and users

Used by analytical and quality control laboratories in chemical and petrochemical companies, solvent manufacturers, contract analytical service providers and regulatory laboratories concerned with solvent purity and impurity profiling. Typical applications include incoming raw-material inspection, final product quality verification, and troubleshooting contamination sources in production or storage.

Related standards

Related documents include other ISO standards and national/international methods covering solvent purity, benzene determination and gas‑chromatographic techniques (for example, ISO methods for organic solvent analysis and recognized ASTM methods for hydrocarbon analysis). Laboratories commonly consult contemporary ISO/TC 47 documents and relevant national standards or up‑to‑date methods that supersede or complement this withdrawn standard.

Keywords

toluene; hydrocarbon impurities; benzene; C8 aromatics; aliphatics; n‑nonane; gas chromatography; flame ionization detector; internal standard; solvent purity; ISO 5279:1980; withdrawn.

FAQ

Q: What is this standard?

A: ISO 5279:1980 is an International Standard that defined a gas‑chromatographic method for determining hydrocarbon impurities in toluene. It was published on 1 October 1980.

Q: What does it cover?

A: It covers the quantitative determination of benzene, C8 aromatics and aliphatics up to n‑nonane in toluene within the mass‑fraction range 0.01 % to 1.00 % using an internal standard and GC‑FID analysis, including identification by retention times and quantification by peak area ratios.

Q: Who typically uses it?

A: Analytical chemists and quality control laboratories in solvent production, petrochemical and chemical industries, and contract testing labs performing solvent‑purity checks and impurity profiling.

Q: Is it current or superseded?

A: ISO 5279:1980 has been withdrawn (withdrawal recorded 11 March 2019). Users should consult current ISO publications, national standards and up‑to‑date methods for equivalent or replacement procedures; withdrawn status means the document is no longer an active ISO standard.

Q: Is it part of a series?

A: It was produced under ISO/TC 47 (laboratory glassware and chemical analysis related technical committee activities). While not part of a formal numbered series, it relates to other ISO analytical methods for solvents and hydrocarbon determinations developed by the same technical committee.

Q: What are the key keywords?

A: toluene, hydrocarbon impurities, benzene, C8 aromatics, aliphatics, n‑nonane, gas chromatography, FID, internal standard, solvent purity.