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| Titel |
Magnetic signature of anthropogenic pollution of soil and correlation with heavy metals in the broader Kozani-Ptolemaida region, Northern Greece. |
| VerfasserIn |
I. Zananiri, S. Spassov, D. Kondopoulou, A. Gault, D. Polya, A. Atzemoglou, B. Maher |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250029983
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| Zusammenfassung |
| Since 1951, the character of Greece has changed from a mainly agricultural into a more
industrial country. In the course of the economic revival, this change implied a rapid
development of urban and industrial areas, resulting in serious consequences for the Hellenic
environment. The present study focuses on fly ash and heavy metal pollution, one of the
major environmental problems of the broader Kozani – Ptolemaida region (northern Greece)
where five power plants are operating. The target of the project was twofold: (a) to challenge
the correlation between ferrimagnetic mineral content and geochemical properties of samples
from polluted areas, (b) to estimate the spatial distribution of several pollutants within the
study area.
Towards this scope, the magnetic susceptibility was mapped using a Bartington
susceptibility meter (MS2D-loop) with a resolution of 1Ã1 km, and soil samples were
collected from each measurement point. After drying and sieving, the specimens were
subjected to several laboratory experiments: measurement of magnetic low-field
susceptibility at low and high frequency, isothermal remanence acquisition, thermomagnetic
analyses, alternating field demagnetization of both natural and isothermal remanent
magnetization, anhysteretic remanence experiments and hysteresis loops. The concentrations
of Fe, Mn, Cr, Cu, Pb and Zn in the studied soils were determined by X-ray fluorescence and
ICP-AES analyses were carried out on HNO3 digests from the same samples.
The in-situ susceptibility values exhibit significant variation, ranging from very low
background values (7Ã10-5 SI) to high values (730Ã10-5 SI), with a mean of 141Ã10-5
SI. The same variation arises from laboratory susceptibility measurements at low and high
frequency, with a mean frequency dependence (F-factor) of 5 %. Preliminary geochemical
measurements indicate concentrations of 40-360 mg(Cr3+)/kg, 10-30 mg(Cu)/kg,
3523-21543 mg(Fe)/kg, 195-1150 mg(Mn)/kg, 46-471 mg(Ni)/kg, 3-25 mg(Pb)/kg and
19-70 mg(Zn)/kg. An excellent linear correlation was found between magnetic
susceptibility and the concentrations of soil Fe, Mn, Cu and Pb, whereas the correlation
between magnetic susceptibility and concentration of Zn and Cr3+ in soil was poor,
suggesting that the pollutants are physically not related to the magnetic minerals. |
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