STUDY OF THE PARTICLE SIZE COMPOSITION OF ATMOSPHERIC SUSPENSION OF THE ADMINISTRATIVE AND INDUSTRIAL CENTER OF EASTERN SIBERIA

Introduction. Snow is an informative object for assessing the chemical load in areas with persistent snow cover. However, snow samples are rarely used as a source of air contamination data. The purpose of the study is to characterize the atmospheric air by the granulometric composition of suspended substances contained in snow samples. Methods. Studies of the particle size distribution of atmospheric suspensions accumulated in the snow cover for the winter period 2017-2018 have been carried out. The snow was placed in sterile containers and stored at room temperature. The liquid was studied on a laser particle analyzer Fritsch Analysette 22 NanoTech (Germany). The measurements were carried out in the range from 0.08 to 2000 μm. Results. At the five points studied, was found the predominance of small particles (with a diameter of 10.1-50 μm and 1-10 μm). Most of the atmospheric suspension (21.8-60.9%) is represented by particles with size from 10.1 to 50 microns. The highest content of fine dust with a diameter of 1-10 microns is noted in the immediate vicinity of the railway tracks. This is probably due to the combustion of diesel fuel in railway locomotives. The background point is located in a residential area that is remote from industrial sources of pollution and highways. The peculiarity of the background point is the content of a significant proportion of particles of large size (fraction from 400 to 700 microns was 27.8%, more than 700 microns - 23.8%). Conclusion. Research indicates the need to further improve the system of social and hygienic monitoring of environmental pollution using snow cover analysis methods.

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