ISO 6841:1988 PDF

Name: ISO 6841:1988 — Surface active agents — Technical straight-chain sodium alkylbenzenesulfonates — Determination of mean relative molecular mass by gas-liquid chromatography
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Surface active agents — Technical straight-chain sodium alkylbenzenesulfonates — Determination of mean relative molecular mass by gas-liquid chromatography

Название (английский):

ISO 6841:1988

Surface active agents — Technical straight-chain sodium alkylbenzenesulfonates — Determination of mean relative molecular mass by gas-liquid chromatography

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 5
Дата публикации:: 2 июня 1988 г.
Издание:: ISO IS 6841 edition 2 version 1
ICS:: 71.100.40

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Описание (английский):

A test portion is desulfonated in concentrated phosphoric acid medium and the liberated alkylbenzene is extracted with light petroleum. The mean relative molecular mass of the extracted alkylbenzene is determined chromatograhically. The mean relative molecular mass of the alkylbenzenesulfonate is calculated.

Abstract

Похожие стандарты

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Overview

ISO 6841:1988 specifies a precise and reliable method for determining the mean relative molecular mass of technical straight-chain sodium alkylbenzenesulfonates using gas-liquid chromatography (GLC). This standard is essential for quality control and characterization of surface active agents, particularly in the context of anionic surfactant analysis. By desulfonating the sample in a concentrated phosphoric acid medium and extracting the liberated alkylbenzene, the method enables chromatographic determination of molecular mass, which is fundamental for understanding surfactant behavior and properties.

Key Topics

Scope and Applicability The method applies strictly to technical straight-chain sodium alkylbenzenesulfonates. It excludes branched-chain alkylbenzenesulfonates due to chromatographic complexities that prevent accurate molecular mass evaluation.

Desulfonation Technique The sample is treated with 85% phosphoric acid to release alkylbenzene, which is then extracted with light petroleum free of aromatic compounds. This selective extraction ensures accurate chromatographic analysis.

Gas-Liquid Chromatography Procedure The extracted alkylbenzene is analyzed via GLC using either capillary or packed columns coated with an apolar stationary phase. Key components include:

Capillary columns of 20–50 m length with dimethylsiloxane-type stationary phases,
Flame ionization detector for sensitive output,
Controlled injection and temperature programming for optimal separation.

Calculation of Molecular Mass Peak areas corresponding to individual alkylbenzene chain lengths are quantitatively assessed using an electronic integrator. The mean relative molecular mass is calculated by weighting the molecular mass of each component by its chromatographic peak area, then adding the molecular weight of the sulfonate group.

Quality and Accuracy Measures Reference alkylbenzene mixtures with known chain distributions are used to verify chromatograph performance. The method achieves repeatability standard deviations around 4 and reproducibility of approximately 4.8, ensuring dependable results across different laboratories.

Applications

Surface Active Agent Characterization This standard is vital for manufacturers and laboratories involved in producing and testing anionic surfactants, especially sodium alkylbenzenesulfonates, used widely in detergents and cleaning agents.

Quality Control and Regulatory Compliance Determining the exact molecular mass ensures product consistency, performance predictability, and compliance with regulatory requirements related to surfactant formulations.

Research and Development Accurate molecular mass data supports formulation scientists in optimizing detergency, biodegradability, and compatibility of surfactants with other formulation components.

Related Standards

ISO 607:1980 - Surface active agents and detergents - Methods of sample division Provides guidelines on sampling techniques that complement molecular mass determination procedures.

Standards on surface active agent testing in general, which include methods for anionic active matter content determination and other physicochemical characterizations.

Summary

ISO 6841:1988 addresses the critical need for an accurate, standardized approach to molecular mass determination of technical straight-chain sodium alkylbenzenesulfonates via gas-liquid chromatography. By combining chemical desulfonation, selective extraction, and precise chromatographic analysis, the method facilitates essential quality control and product characterization in the surfactant industry. The standard’s focus on analytical rigor and interlaboratory reproducibility makes it a cornerstone for surfactant testing laboratories worldwide.

Keywords: ISO 6841, sodium alkylbenzenesulfonates, surface active agents, mean relative molecular mass, gas-liquid chromatography, GLC, anionic surfactants, molecular weight determination, surfactant quality control, chromatographic analysis

ISO 6841:1988 PDF

Abstract

Похожие стандарты

Overview

Key Topics

Applications

Related Standards

Summary

Технические детали

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