The article contains results of studies characterizing nanoparticles in blood and serum of exposed workers engaged into titanium and magnesium production and workers outside coverage of occupational factors. Comparative study of the workers' serum included dynamic light dispersion, scanning electronic microscopy, transmission electronic microscopy. Measuring despersion characteristic of blood serumin the workers exposed to nanomaterial revealed increased percentage of particles with hydrodynamic diameter within 60-100 nm and over 100 nm.
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