nanoparticles. Most nanoparticles are unstable in dispersion, prone to aggregation and sedimentation, which significantly affects the process of absorption of nanoparticles and their toxicity. Conclusions. The toxicity and danger of nanoparticles and nanomaterials depend on many factors and their combinations. The complexity of assessing the impact of nanostructures is determined by the range of variability of properties, chemical, geometric, physicochemical properties and characteristics, size, surface of nanoparticles. The improvement and development of new approaches to identifying the danger of nanoscale objects is a promising direction of scientific investigations.
The concentration of ultrafine particles at welder's workplace was investigated. It is confirmed that ultrafine particles with diameters < 100 nm are generated in welding and enter the workplace zone. Also, it is found that the concentration of ultrafine particles depends on the сomposition and diameter of a welding electrode as well as on the distance from the welding shelter zone. It is advisable to continue studies on the regulation of ultrafine particles, generated in welding of different types.
Інститут медицини праці імені Ю. І. Кундієва Національної академії медичних наук України», м. Київ 2 Вища школа фармацевтичних наук Нагойського університету, м. Нагоя, Японія
The article presents the peculiarities of changes of concentrations of nanoparticles in the working air during welding operations over time, which are characterized in most cases by a sharp increase in their emission during the first minutes after welding and reducing with ambiguous fluctuations within 30 minutes and over. Also, data on the formation of nanoparticles in various production processes associated with the production of nanoproducts, which concentrations may exceed the exposure levels recommended in the EU countries, which requires both the improvement of technological processes and the development of safety measures when working with nanoscale objects, have been summarized.
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