Micro-scale grain-size analysis and magnetic properties of coal-fired power plant fly ash and its relevance for environmental magnetic pollution studies

Blaha, U.; Sapkota, B.; Appel, Erwin; Stanjek, Helge; Rösler, Wolfgang

doi:10.1016/j.atmosenv.2008.07.051

Cited by 99 publications

(63 citation statements)

References 23 publications

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“…Consequently, the presence of TMPs in topsoil (mainly in the organic horizon) is considered an indicator for heavy metal soil pollution. This fact was confirmed by many authors (Veneva et al 2004;Klose and Makeschin 2005;Spiteri et al 2005;Blaha et al 2008;Jordanova et al 2008;Lu et al 2008;Magiera et al 2008;Bućko et al 2011). Soil with natural plant cover, particularly forest soil, is often used as a target for magnetic susceptibility studies because it exhibits the stratigraphic sequence of the depositing dusts in undisturbed soil horizons for a long time.…”

Section: Introductionsupporting

confidence: 48%

The influence of the wind direction and plants on the variability of topsoil magnetic susceptibility in industrial and urban areas of southern Poland

2016

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Volume magnetic susceptibility (j) was measured on the soil surface and in the vertical topsoil profile within a 300 km 2 area located in an urban-industrial conurbation. The results were compared to plant species compositions in the forest storeys, elevation above sea level, and terrain geomorphology. The content and mineral composition of the magnetic fraction were determined in the soil horizons. It was found that the extent of the area with enhanced topsoil magnetic susceptibility was similar to the dominant wind direction (south-west). Enhanced j values were observed for the soil at the forest margin on the leeward side of the emitters as well as at sites located on exposed local elevations (C10 m). There were no significant correlations between species composition of the forest stand and soil surface j value (measured both with and without forest litter). Soil covered with deciduous treesmostly ash (Fraxinus excelsior L.)-demonstrated higher j values than soil under coniferous tree species. However, our results suggest that this parameter is not controlled by individual tree species, but rather depends on distance from emission sources, intensity of magnetic particle emission, and meteorological conditions (prevailing wind directions and dynamics).

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Section: Introductionsupporting

confidence: 48%

The influence of the wind direction and plants on the variability of topsoil magnetic susceptibility in industrial and urban areas of southern Poland

2016

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“…Si, Al contents of 26.18, 31.94 % are found and a similar trend is seen for the other three fly ashes. Here EDX analyses reveal that magnetospheres have a glassy matrix rich in Fe on which metallic brighter regions of high Fe content can be found, which represent zones of very high Fe concentration, and these zones of high iron concentration vary in size for all four types of the fly ashes, as also determined by [43]. Moreover, it can also be seen that the zone of high Fe concentration has comparatively very high contents of Mg and slightly high contents of heavy metals compared to the inner glassy zone for all four fly ashes.…”

Section: Edx Analyses Of Magnetospheresmentioning

confidence: 96%

“…It can be seen from Tab. 2 that fly ashes from Počerady, Mělník, Ledvice, and Dětmarovice show a Fe content from 1.35 % up to 7.22 % but the actual content of the magnetospheres can only be found by separating these particles from fly ashes as carried out by [43]. Magnetospheres found in fly ash are formed from iron minerals in boilers of power plants as a result of rapid heating with melting of constituents [44].…”

Section: Edx Analyses Of Magnetospheresmentioning

confidence: 99%

Determining the Role of Individual Fly Ash Particles in Influencing the Variation in the Overall Physical, Morphological, and Chemical Properties of Fly Ash

et al. 2016

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Abstract. The properties of fly ashes vary because of the differences in the properties of their individual particles, and the determination of variation in these properties is of interest to the industries which use pulverized raw fly ash in applications, such as in cementitious materials and in the recovery of certain rare elements from raw fly ash. To investigate the differences in individual particles, four pulverized raw fly ashes from thermal power plants of the Czech Republic were used in this research. It was observed from FE-SEM that all four fly ashes consist of glassy hollow spherical, solid spherical, porous spherical, bright spherical, porous slaggy and compact slaggy particles. Box and whisker diagrams were plotted from the data of EDX individual particle analyses, which showed that the data of percentages for the Si, Al, and Fe elements is more scattered as compared to other elements. It was further observed from ternary phase diagrams and pseudo coloured images, that nature of fly ash particles changes from alumino silicate glassy to alumino silicate calcite metallic to pure ferro-metallic, where glassy particles showed high percentages and pure calcite particles were absent in fly ashes. Furthermore, a comparison between the XRF, the EDX total area analyses, showed that the EDX individual particle analysis gives more realistic and reliable data with median, mean, and the standard deviation for percentages of each element present in the fly ashes.

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“…Such objects were previously described as being fly ash from coal-fired infrastructure (Puffer 1980, Blaha et al 2008, Horng et al 2009). The sample site from which they were obtained is located relatively close to the urbanized agglomeration of Gdańsk and Gdynia, so it would seem likely that they are man-made spherules from the coal-fired infrastructure in these cities, transported to the sea by the wind.…”

Section: Discussionmentioning

confidence: 99%

Micro-scale magnetic grains from shallow water sediments of the Gulf of Gdańsk

Uścinowicz

2009

Oceanological and Hydrobiological Studies

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Three cores recovered from the Gulf of Gdańsk in 2006 contain magnetic spherules of different origins. According to their chemical compositions and morphological features the magnetic grains were divided into two groups: (1) anthropogenic spherules primarily composed of SiO 2 , Al 2 O 3 and Fe 2 O 3 ; (2) Fe-oxide spherules of extraterrestrial origin. These two groups are present in the surface sediments, indicating they are products of both man-made pollution and an influx of extraterrestrial matter. The presence of anthropogenic dust in the marine sediments is a record of pollution from nearby industrialized areas. On the basis of the presence of these spherules a tool could be developed for studying sedimentation rates in the marine sediments. However more precise studies are required to develop this method.

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Micro-scale grain-size analysis and magnetic properties of coal-fired power plant fly ash and its relevance for environmental magnetic pollution studies

Cited by 99 publications

References 23 publications

The influence of the wind direction and plants on the variability of topsoil magnetic susceptibility in industrial and urban areas of southern Poland

The influence of the wind direction and plants on the variability of topsoil magnetic susceptibility in industrial and urban areas of southern Poland

Determining the Role of Individual Fly Ash Particles in Influencing the Variation in the Overall Physical, Morphological, and Chemical Properties of Fly Ash

Micro-scale magnetic grains from shallow water sediments of the Gulf of Gdańsk

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