Magnetic Susceptibility and Heavy Metal Content in Dust From the Lime Plant and the Cement Plant in Opole Voivodeship
Until now, dust arising from lime manufacture has been considered harmless to the environment so it has been investigated marginally from the standpoint of environmental protection, especially when it came to magnetic properties and heavy metal content. The aim of the research was filling the gap in this area. The research comprised measurements of magnetic susceptibility, the content of heavy metals, reaction (pH) and specific conductivity of lime dust and also raw material and fuel used for lime production. The samples were taken from one of the lime plants located in Opole Province. Similar investigations were also performed for dust taken from the nearby cement plant using dry method of cement production. It was proven that magnetic susceptibility, heavy metal content and conductivity of lime dust was lower in comparison to cement dust, which resulted from the fact that the lime plant used neither low raw materials nor additives. Due to the high atmosphere dust level in the vicinity of the investigated plants, extremely basic reaction of the tested dust and high content of metals, the studied dust cause alkalization of soils and contribute to the increase of heavy metal content in soils, posing a threat to the environment.
Urban forests and parks, besides a recreation function, play significant role in pollution removal by tree canopies. Main sources of dust emissions in cities are industry (steelworks, power plants, coking plants, cement plants) and traffic. The most of dusts, stored in tree crowns, are deposited on soil surface as litterfall (leaves, needles) or are washed into soil by stemflow and throughfall. However, certain amount of dusts can be released into atmosphere as secondary dust emission. The presented studies were conducted on areas of four urban parks and both magnetic and chemical analyses of topsoil were employed. Results show topsoil contamination by heavy metals in urban parks and cumulative role of vegetations (trees) in processes of distribution of air pollution into soil surface. Magnetic susceptibility measurements allow for discrimination of areas for being the potential sources of secondary dust emission in urban parks.