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ISO 13794:2019

Ambient air — Determination of asbestos fibres — Indirect-transfer transmission electron microscopy method

Edition date: 2019-10-01
In Force
Available languages: French, English
Summary:

Le présent document spécifie une méthode de référence utilisant la microscopie électronique à transmission pour la détermination de la concentration en fibres et structures d'amiante en suspension dans l'air dans les atmosphères ambiantes, notamment les atmosphères intérieures de bâtiments, et pour l'évaluation détaillée des structures d'amiante dans les atmosphères. Le mode opératoire de préparation des échantillons comprend la calcination et la dispersion des particules recueillies, de sorte que la totalité de l'amiante est mesurée, y compris l'amiante initialement incorporée dans les agrégats particulaires ou les particules de matériaux composites. Les longueurs, largeurs et rapports longueur/largeur des fibres et faisceaux d'amiante sont mesurés. Ils permettent également, conjointement avec la densité du type d'amiante, de calculer la concentration massique totale d'amiante en suspension dans l'air. La méthode permet de déterminer le(s) type(s) de fibres d'amiante présentes. La méthode ne peut pas faire la différence entre les fibres individuelles d'amiante amphibole et fragments allongés (fragments de clivage et particules aciculaires) et les analogues non asbestiformes du même minéral amphibole[12].



This document specifies a reference method using transmission electron microscopy for the determination of airborne asbestos fibres and structures in in a wide range of ambient air situations, including the interior atmospheres of buildings, and for a detailed evaluation for asbestos structures in any atmosphere. The specimen preparation procedure incorporates ashing and dispersion of the collected particulate, so that all asbestos is measured, including the asbestos originally incorporated in particle aggregates or particles of composite materials. The lengths, widths and aspect ratios of the asbestos fibres and bundles are measured, and these, together with the density of the type of asbestos, also allow the total mass concentration of airborne asbestos to be calculated. The method allows determination of the type(s) of asbestos fibres present. The method cannot discriminate between individual fibres of the asbestos and elongate fragments (cleavage fragments and acicular particles) from non-asbestos analogues of the same amphibole mineral[12].
ICS: 13.040.20-Ambient atmospheres
CTN: ISO/TC 146/SC 3 - 52750

Standards Cancellations

Anula a ISO 13794:1999

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