URANIUM AND THORIUM IN AEROSOL FALLOUT OF NOVOSIBIRSK CITY AND ITS VICINITY (WEST SIBERIA)

Известия Томского политехнического университета: Инжиниринг георесурсов

Svetlana Yu. Artamonova¹ 

[1] V.S. Sobolev Institute of Geology and Mineralogy SB RAS;

关键词: industrial emission;    aerosol fallout;    technogenic aerosol;    snow cover;    radionuclides;    thorium;    uranium;    novosibirsk;   

DOI  :  10.18799/24131830/2020/7/2731

来源: DOAJ

【 摘 要 】

The relevance of the study is caused by the necessity to develop geoecological approaches to evaluation of air quality in the urban territories and to determine the contribution of the emissions of separate industrial sources into the technogenous pollution of urban air. The aim of the study is to determine the technogenous aerosol load and aerosol-based precipitation of Th and U in the vicinity of five large industrial enterprises of Novosibirsk. Objects: dust and aerosol particles accumulated in the snow cover in the vicinity of Heat Stations No. 2, 3, 5, Novosibirsk Tin Plant and Novosibirsk Plant of Chemical Concentrates during the winter season. The technogenous component in the aerosol of Novosibirsk and its vicinities was not previously considered in detail in open publications. Methods: large-volume (up to 400 dm3) sampling of snow cover to isolate the portions of suspensions from melted snow by filtering, so that the amount of solid suspensions would be sufficient for analyses; determination of the density of diurnal aerosol precipitation (diurnal aerosol load) through calculations of the ratio of the mass of solid suspensions from the samples of melted snow to the sampling area and the number of days during which the snow cover exists (since the day when the snow cover was formed till the sampling date); determination of soot content in aerosol by ashing at 550 °C, determination of Th and U content by means of X-ray fluorescence with the synchrotron radiation. Results. On the basis of the density of diurnal aerosol precipitation within the major aureoles of emissions from industrial enterprises of Novosibirsk, evaluation of the pollution of urban air is carried out. The content of Th and U in aerosol and the density of their precipitation on the Earth’s surface with aerosol are determined. The highest uranium content was established in aerosol samples collected within the aureole of emissions from the Novosibirsk Plant of Chemical Concentrates. The features of Th and U arrival with the emissions from heat stations during the combustion of brown and black coal are determined.

【 授权许可】

Unknown