Zpravodaj Hnědé uhlí 2011, 51(4)
Daily and seasonal dynamics of PM10 and PM1 in the fall line of the slope of the Nástup Tušimice Mine
- 1 Ústav pro životní prostředí
- 2 Výzkumný ústav pro hnědé uhlí a.s., Most
During two summer and one winter sampling campaigns, concentration of PM10 and PM1 were taken every 5 minutes following the fall line of the north-eastern slope of the Nástup Mine. In summer, PM1 levels did not show any differences throughout the fall line, although the daily dynamics was observed only in 2009, not in 2010. In contrast, PM10 levels showed daily dynamics in both years and were higher within 60 metres above the coal seam. Aerosol concentration in the adjacent area of the mine was temporarily elevated in five cases, while the response reached 23 to 39 % of PM10 levels measured in the mine. On-site measurements revealed that mining activities produce particles over 1 μm. These findings are in accordance with laboratory resuspension measurements of coal particles size distribution when particles over 1 μm constitute 90 % of matter and the resuspension coefficient of homogenized coal amount to 0.0001. Using the coefficient, a maximum theoretical level of PM10 was calculated to be 850 μg.m-3, while a maximum measured level was only 288 μg.m-3. The difference between the theoretical and measured level of PM10 can be explained by concentration inhomogenity of aerosol in the area of the mine and, especially, by the vertical transport of aerosol.
Keywords: open pit mine, air pollution, dust, DustTrak
Published: December 1, 2011 Show citation