Luftkvalitet

Ämnesområden: Arbetsplatsluft
Kommittébeteckning: SIS/TK 423 (Luftkvalitet)
Källa: CEN
Svarsdatum: den 1 mar 2018
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This European Standard provides the methodology for measuring and characterizing the dustiness of a bulk material that contains or releases nano-objects or submicrometer particles. In addition, it specifies the environmental conditions, the sample handling procedure and the method of calculating and presenting the results. Guidance is given on the choice of method to be used.

The methodology described in this European Standard enables

a) the quantification of dustiness in terms of health-related index mass fractions,

b) the quantification of dustiness in terms of an index number and an emission rate, and

c) the characterization of the aerosol from its particle size distribution and the morphology and chemical composition of its particles.

NOTE 1 Currently, no number-based classification scheme in terms of particle number has been established for particle dustiness release. Eventually, when a large enough number of measurement data has been obtained, the intention is to revise this European Standard and to introduce a number-based classification scheme.

This European Standard is applicable to all bulk materials, including powders, granules or pellets, containing or releasing nano-objects or submicrometer particles.

NOTE 2 The vortex shaker method specified in part 5 of this European Standard has not yet been evaluated for pellets and granules.

NOTE 3 The rotating drum and continuous drop methods have not yet been evaluated for nanofibres and nanoplates.

This European Standard does not provide methods for assessing the release of particles during handling or mechanical reduction of machining (e.g. crushing, cutting, sanding, sawing) of solid nanomaterials (e.g. nanocomposites).

Ämnesområden: Arbetsplatsluft
Kommittébeteckning: SIS/TK 423 (Luftkvalitet)
Källa: CEN
Svarsdatum: den 1 mar 2018
Se merSe mindre
 

This European Standard provides the methodology for measuring the dustiness of bulk materials that contain or release nano-objects or submicrometer particles, under standard and reproducible conditions and specifies for that purpose the rotating drum method.

In addition, this European Standard specifies the selection of instruments and devices and the procedures for calculating and presenting the results. It also gives guidelines on the evaluation and reporting of the data.

The methodology described in this European Standard enables

a) the measurement of the respirable, thoracic and inhalable dustiness mass fractions,

b) the measurement of the number-based dustiness index of respirable particles in the size range from about 10 nm to 1 000 nm,

c) the measurement of the number-based emission rate of respirable particles in the size range from about 10 nm to 1 000 nm,

d) the measurement of the number-based size distribution of the released aerosol in the size range from about 10 nm to 10 μm, and

e) the collection of released airborne particles in the respirable fraction for subsequent observations and analysis by analytical electron microscopy.

This European Standard is applicable to the testing of a wide range of bulk materials including powders, granules or pellets containing or releasing nano-objects or submicrometer particles in either unbound, bound uncoated and coated forms.

NOTE 1 Currently no number-based classification scheme in terms of dustiness indices or emission rates have been established. Eventually, when a large number of measurement data has been obtained, the intention is to revise this European Standard and to introduce such a classification scheme, if applicable.

NOTE 2 The method specified in this European Standard has not been investigated for the measurement of the dustiness of bulk materials containing nanofibres and nanoplates in terms of number-based dustiness indices or emission rates. However, there is no reason to believe that the number-based dustiness indices or emission rates could not be measured with the rotating drum using the set-up described in this European Standard.

Ämnesområden: Arbetsplatsluft
Kommittébeteckning: SIS/TK 423 (Luftkvalitet)
Källa: CEN
Svarsdatum: den 1 mar 2018
Se merSe mindre
 

This European Standard provides the methodology for measuring the dustiness of bulk materials that contain or release nano-objects or submicrometer particles, under standard and reproducible conditions and specifies for that purpose the continuous drop method.

In addition, this European Standard specifies the selection of instruments and devices and the procedures for calculating and presenting the results. It also gives guidelines on the evaluation and reporting of the data.

The methodology described in this European Standard enables

a) the measurement of the respirable and inhalable dustiness mass fractions,

b) the measurement of the number-based dustiness index of respirable particles in the size range from about 10 nm to 1 000 nm,

c) the measurement of the number-based emission rate of respirable particles in the size range from about 10 nm to 1 000 nm,

d) the measurement of the number-based size distribution of the released aerosol in the size range from about 10 nm to 10 μm, and

e) the collection of released airborne particles in the respirable fraction for subsequent observations and analysis by analytical electron microscopy.

This European Standard is applicable to the testing of a wide range of bulk materials including powders, granules or pellets containing or releasing nano-objects or submicrometer particles in either unbound, bound uncoated and coated forms.

This European Standard is applicable to all bulk materials containing nanoparticles or releasing nanoparticles while being handled.

NOTE 1 Currently no number-based classification scheme in terms of dustiness indices or emission rates have been established. Eventually, when a large number of measurement data has been obtained, the intention is to revise this European Standard and to introduce such a classification scheme, if applicable.

NOTE 2 The methods specified in this European Standard have not been evaluated for nanofibers and nanoplates.

Ämnesområden: Arbetsplatsluft
Kommittébeteckning: SIS/TK 423 (Luftkvalitet)
Källa: CEN
Svarsdatum: den 1 mar 2018
Se merSe mindre
 

This European Standard provides the methodology for measuring and characterizing the dustiness of bulk materials that contain or release nano-objects or submicrometer particles, under standard and reproducible conditions and specifies for that purpose the small rotating drum method.

In addition, this European Standard specifies the selection of instruments and devices and the procedures for calculating and presenting the results. It also gives guidelines on the evaluation and reporting of the data.

The methodology described in this European Standard enables

a) the measurement of the respirable dustiness mass fraction,

b) the measurement of the number-based dustiness index of respirable particles in the size range from about 10 nm to 1 000 nm,

c) the measurement of the number-based size distribution of the released aerosol in the size range from about 10 nm to 10 μm,

d) the quantification of the initial dustiness emission rate and the time to reach 50 % of the total particle number released during testing, and

e) the characterization of the aerosol from its particle size distribution and the morphology and chemical composition of its particles.

This European Standard is applicable to the testing of a wide range of bulk materials including powders, granules or pellets containing or releasing nano-objects or submicrometer particles in either unbound, bound uncoated and coated forms.

NOTE 1 Currently no number based classification scheme in terms of particle number and emission rate has been established for powder dustiness. Eventually, when a large number of measurement data has been obtained, the intention is to revise the European Standard and to introduce such a classification scheme, if applicable.

NOTE 2 The small rotating drum method has been applied to test the dustiness of a range of materials including nanoparticle oxides, nanoflakes, organoclays, clays, carbon black, graphite, carbon nanotubes, organic pigments, and pharmaceutical active ingredients. The method has thereby been proven to enable testing of a many different materials that can contain nanomaterials as the main component.

Ämnesområden: Arbetsplatsluft
Kommittébeteckning: SIS/TK 423 (Luftkvalitet)
Källa: CEN
Svarsdatum: den 1 mar 2018
Se merSe mindre
 

This European Standard provides the methodology for measuring and characterizing the dustiness of bulk materials that contain or release nano-objects or submicrometer particles, under standard and reproducible conditions and specifies for that purpose the vortex shaker method.

In addition, this European Standard specifies the selection of instruments and devices and the procedures for calculating and presenting the results. It also gives guidelines on the evaluation and reporting of the data.

The methodology described in this European Standard enables

a) the measurement of the respirable dustiness mass fraction,

b) the determination of the mass-based dustiness index of respirable particles in the size range from about 10 nm to 1 000 nm;

c) the determination of the number-based dustiness index of respirable particles in the size range from about 10 nm to 1 000 nm;

d) the determination of the number-based emission rate of respirable particles in the size range from about 10 nm to 1 000 nm;

e) the determination of the number size distribution of the released respirable aerosol in the size range from about 10 nm to 10 μm;

f) the collection of released airborne particles in the respirable fraction for subsequent observations and analysis by electron microscopy.

This European Standard is applicable to the testing of a wide range of bulk materials including nanomaterials in powder form.

NOTE 1 With slightly different configurations of the method specified in this European Standard, dustiness of a series of carbon nanotubes has been investigated ([5] to 10]). On the basis of this published work, it can be assumed that the vortex shaker method is also applicable to nanofibres and nanoplates.

This European Standard is not applicable to millimetre-sized granules or pellets containing nano-objects in either unbound, bound uncoated and coated forms.

NOTE 2 This comes from the configuration of the vortex shaker apparatus and the small test sample required. Eventually, if future work provides accurate and repeatable data demonstrating that this is possible, the intention is to revise the European Standard and to introduce this application.

NOTE 3 As observed in the pre-normative research Project [4], the vortex shaker method specified in this European Standard provides a more energetic aerosolization than the rotating drum, the continuous drop and the small rotating drum specified in prEN 17199-2:2017 [1], prEN 17199-3:2017 [2] and prEN 17199-4:2017 [3], respectively. It can better simulate high energy dust dispersion operations or processes where vibration is applied or even describe a worst case scenario in a workplace, including the (non-recommended) practice of cleaning contaminated worker coveralls and dry work surfaces with compressed air.

NOTE 4 Currently no classification scheme in terms of dustiness indices or emission rates has been established according to te vortex shaker method. Eventually, when a large number of measurement data has been obtained, the intention is to revise the European Standard and to introduce such a classification scheme, if applicable.

Kommittébeteckning: SIS/TK 423 (Luftkvalitet)
Källa: ISO
Svarsdatum: den 10 apr 2018
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This international standard specifies the use of FTIR spectrometry for determining the concentrations of individual volatile organic compound (VOC) in waste gases from non-combustion processes. The method can be employed to continuously analyse sample gas which is extracted from ducts and other sources. A bag sampling method may also be applied, if the compounds do not adsorb on the bag material. This would only be used in cases where it is difficult or impossible to obtain a direct extractive sample.

The principle, sampling procedure, IR spectral measurement and analysis, calibration, handling interference, QA/QC procedures and some essential performance criteria for measurement of individual VOCs are described in this standard.

Note 1 The practical minimum detectable concentration of this method depends on the FTIR instrument (i.e. gas cell path length, resolution, instrumental noise and analytical algorithm used), compounds, and interference specific (e.g. water and CO2).

Ämnesområden: Arbetsplatsluft
Kommittébeteckning: SIS/TK 423 (Luftkvalitet)
Källa: ISO
Svarsdatum: den 15 apr 2018
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1.01 This International Standard gives general guidance for the sampling and analysis of airborne organic isocyanates in workplace air.

1.02 This International Standard is appropriate for a wide range of organic compounds containin isocyanate groups, including monofunctional isocyanates (e.g. phenyl isocyanate), diisocyanate monomers (e.g. 1,6-hexamethylene diisocyanate (HDI), toluene diisocyanate (TDI), 4,4’ diphenylmethane diisocyanate (MDI), and isophorone diisocyanate (IPDI)), prepolymers (e.g. the biuret and isocyanurate of HDI), as well as chromatographable intermediate products formed during production or thermal breakdown of polyurethane.

1.03 In mixed systems of HDI and IPDI products, it is impossible to identify and quantify low levels of IPDI monomer using this International Standard, due to coelution of IPDI monomer with HDI-uretidinedione.

1.04 It is known that the method underestimates the oligomer in MDI-based products. Total isocyanate group (NCO) will be underestimated in MDI-based products by about 35% as compared to dibutylamine titration.

1.05 The method has been successfully modified to be used with LC-MS-MS for TDI monomer using an isocratic 70% acetonitrile/30% 10 mM ammonium formate mobile phase.

1.06 The useful range of the method, expressed in moles of isocyanate group per species per sample, is approximately 1 × 10−10 to 2 × 10−7. The instrumental detection limit for the monomers using both ultraviolet (UV) detection and fluorescent (FL) detection is about 2 ng monomer per sample.
The useful limit of detection for the method using reagent impregnated filters is about 10-20 ng monomer per sample for both UV and FL detection. For a 15 l sample, this corresponds to 0.7-1.4 µg.m-3. For impinger samples, which require solid phase extraction, experience has shown that the useful limit of detection is about 30-80 ng monomer per sample.