Kvalita ovzduší

Oblast zaměření: Kvalita ovzduší
Komise : CEN/TC 137 (Assessment of workplace exposure)
Původce: CEN
K připomínkám do: 25.03.2019
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This document specifies the determination of the size weighted fine fraction (SWFF) and the size weighted fine fraction of crystalline silica (SWFFCS) in bulk materials by calculation. The document also describes the assumptions and preconditions to be fulfilled in order for this method to be valid.

The purpose of this document is to allow users to evaluate bulk materials with regard to their size-weighted fine fraction and crystalline silica content.

The calculation method is applicable only after experiments have shown that the results are accurate and consistently equal or higher than the results from sedimentation, as described in prEN 17289‑3:2018, for that particular bulk material.

For preparation of the sample and determination of crystalline silica by XRD and FT-IR see prEN 17289‑1:2018.

A specific method for the evaluation of the SWFF for diatomaceous earth bulk materials is given in Annex A. Due to the internal porosity of diatomaceous earth, the general instructions given in this document are adapted in order to take into account the material’s effective density.

This document is applicable for bulk materials which have been fully investigated and validated. The criteria for the materials are described in this document and prEN 17289‑3:2018. This includes industrial minerals which can contain crystalline silica such as quartz, clay, kaolin, talc, feldspar, mica, cristobalite, vermiculite, diatomaceous earth, barite, andalusite, iron ore, chromite etc.

Oblast zaměření: Kvalita ovzduší
Komise : CEN/TC 264 (Air quality)
Původce: CEN
K připomínkám do: 25.03.2019
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This document specifies a method for the sampling and analysis of NH3 in ambient air using diffusive sampling.

It can be used for NH3 measurements at ambient levels, but the concentration range and exposure time are sampler dependent, and the end user is therefore advised to comply with the operating instructions provided by the manufacturer.

NOTE          Denuders may be used as a surrogate reference method until there are improvements in the continuous optical methods.

Oblast zaměření: Kvalita ovzduší
Komise : CEN/TC 137 (Assessment of workplace exposure)
Původce: CEN
K připomínkám do: 25.03.2019
Zobraz více Zobraz méně
 

This document specifies the determination of the size weighted fine fraction (SWFF) and the size weighted fine fraction of crystalline silica (SWFFCS) in bulk materials by means of a sedimentation method using a liquid sedimentation technique.

The purpose of this document is to allow users to evaluate bulk materials with regard to their size-weighted fine fraction and crystalline silica content.

For preparation of the sample and determination of crystalline silica by XRD and FT-IR see prEN 17289‑1:2018.

Annex A to Annex E describe specific methods for the evaluation of SWFF for specific bulk materials.

This document is applicable for bulk materials which have been fully investigated and validated. The criteria for the materials are described in this document and prEN 17289‑2:2018. This includes industrial minerals which can contain crystalline silica such as quartz, clay, kaolin, talc, feldspar, mica, cristobalite, vermiculite, diatomaceous earth, barite, andalusite, iron ore, chromite etc.

Oblast zaměření: Kvalita ovzduší
Komise : CEN/TC 137 (Assessment of workplace exposure)
Původce: CEN
K připomínkám do: 25.03.2019
Zobraz více Zobraz méně
 

This document specifies the the requirements and choice of test method for the determination of the size weighted fine fraction (SWFF) and the size weighted fine fraction of crystalline silica (SWFFCS) in bulk materials.

This document gives also guidance on the preparation of the sample and determination of crystalline silica by XRD and FT-IR.

NOTE          prEN 17289‑2:2019 specifies a method to estimate the size-weighted fine fraction from a measured particle size distribution and assumes that the particle size distribution of the crystalline silica particles is the same as the other particles present in the bulk material. prEN 17289‑3:2019 specifies a method using a liquid sedimentation technique to determine the size-weighted fine fraction of crystalline silica. Both methods are based upon a number of limitations and assumptions, which are listed in prEN 17289‑2:2019 and prEN 17289‑3:2019, respectively. The method in prEN 17289‑3:2019 can also be used for other constituents, if investigated and validated.

This document is applicable for bulk materials which have been fully investigated and validated. The criteria for the materials are described in prEN 17289‑2:2019 and prEN 17289‑3:2019. This includes industrial minerals which can contain crystalline silica such as quartz, clay, kaolin, talc, feldspar, mica, cristobalite, vermiculite, diatomaceous earth, barite, andalusite, iron ore, chromite etc.

Oblast zaměření: Kvalita ovzduší
Komise : CEN/TC 264 (Air quality)
Původce: CEN
K připomínkám do: 2.04.2019
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This document contains specifications for active sampling of bioaerosols from exhaust air flowing through a defined cross-section of a stack. It defines general principles that have to be taken into account during an isokinetic sampling campaign for bioaerosols by bubbling the exhaust air through a specific impinge designed for emission measurements.

In this document the application with culturable organisms is specified but the same principle might be applicable for non-cultural based methods (e.g. molecular and/or enzyme-based methods).

The impinger is designed to allow a sample volume flow of 1 m3/h to 1,8 m3/h, or 16 l/min to 30 l/min, respectively, and has been tested with regard to various microorganisms within broad concentration ranges [1; 2; 3; 4]. [1])

 

[1]) This method is accepted by convention as reference method for determination of total emissions under application of an out stack configuration according to EN 13284-1.