| Specifications | Ultra-fine particles at the workplace \Focus on IFA s work No. 160\ IFA |
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| Specifications | Ultra-fine particles at the workplace \Focus on IFA s work No. 160\ IFA |
| Business section |
| Specifications | Ultra-fine particles at the workplace \Focus on IFA s work No. 160\ IFA |
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| Content | Problem There appears to be a particular health risk from ultra-fine dust particles in respiratory air. Ultra-fine aerosol particles are for the most part the product of condensation in thermal and chemical reac- tions. Typical examples include welding fumes, metal fumes, polymer fumes, technical soot parti- cles, amorphous silicic acids, and particulate die- sel motor emissions. The primary particles that are thus created have a size of only a few nanometres (nm). They also agglomerate directly after forma- tion and form even larger particles. Aiding the assessment of dust exposure at the workplace, the European standard EN 481 defines the proportion of dusts that can be inhaled and penetrate the alveoli. Such a definition does not exist for the proportion of ultra-fine particles. This can in part be traced to the paucity of information from occupational medicine in this area. The threshold limit values for dust in occupational hygiene (inhalable and respirable dust fraction) – excluding fibres – are related to the mass of the dust. These fractions do include particles smaller than 100nm; yet while these ultra-fine particles make up more than 80% of the total particles, their proportion of the total mass is negligible. Various experimental results and observation studies strongly suggest that ultra-fine particles have a stronger effect on the human organism than an equal mass of larger particles when unsoluble. The effects here do not seem related to the mass of particles, but rather to their number. Distribution of ultra-fine particles in a foundry. Total particle quantity : 5.8⋅105/cm3, Maximum 54nm, Inhalable dust fraction: 1.65mg/m³ Activities The IFA, in conjunction with the German institu- tions for social accident insurance, carried out a measurement programme at selected workplaces. The aim was to gather and catalogue technical measurement information on ultra-fine particles arising from different work processes. The particle size distribution between approximately 10nm and 500nm and the number concentration of these particles were determined. IFA was equipped with a suitable measurement device (scanning mobility particle sizer – SMPS) for these particular meas- urements. The illustration depicts a set of meas- urement results from a foundry. Ultra-fine particles at the workplace 0160 Edition 2/2013 617.0-IFA:638.3 |
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| Following Datasheets | aifa0183e (2 pages) aifa0197e (2 pages) aifa0212e (2 pages) aifa0220e (2 pages) aifa0231e (2 pages) aifa0233e (2 pages) aifa0251e_2 (2 pages) aifa0265e (2 pages) aifa0276e (2 pages) aifa0277e (2 pages) |
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