Technogenic and Geochemical Diagnostics of Soils Distributed on the Territory of the "Kremikovtsi" Metallurgical Plant
The content of Rubidium, Strontium, Cesium and Barium in soils with a metamorphic and poorly developed profile, subjected to active technogenic pollution from the activity of the former Kremikovtsi metallurgical plant, was analyzed. Six profiles were included in the study - 5 of Technosols from t...
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| Format: | Article |
| Language: | English |
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Bulgarian Soil Science Society
2023-06-01
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| Series: | Bulgarian Journal of Soil Science |
| Subjects: | |
| Online Access: | https://www.bsss.bg/issues/Issue1_2023/BJSS_2023_1_2.pdf |
| Summary: | The content of Rubidium, Strontium, Cesium and Barium in soils with a metamorphic and
poorly developed profile, subjected to active technogenic pollution from the activity of the former
Kremikovtsi metallurgical plant, was analyzed. Six profiles were included in the study - 5 of
Technosols from the plant territory and one external control profile of Rhodic Cambisol. Metal
content was determined by the LA-ICP-MS method, with data obtained simultaneously with data
for over 50 chemical elements. According to the results obtained, the average content of Rb is (in
μg/g) 206.10, of Sr - 156.05, of Cs - 12.97 and of Ba - 1876.80, with the values for Barium,
Rubidium and Cesium exceeding the average world reference values by 4, 3 and 2.5 times
respectively and those of Strontium are slightly below them. The contents of the four metals are
genetically determined and naturally geochemical inherited from the high initial contents in the soilforming proluvial sediments. Contamination has contributed to a very large accumulation of the
heavy alkaline earth metals Ba and Sr in all alkalized spolic/carbonate surface horizons of
Technosols, where they are present as sparingly soluble sulfates, carbonates and phases adsorbed by
iron and manganese oxides. A statistically significant positive correlation was determined between
Ba and Pb, based entirely on the technogenic effect, in which part of the accumulated lead was
adsorbed by sparingly soluble secondary sulfates and carbonates of the alkaline earth metals and
especially Barium. The alkali metals in these soils migrate down the soil profile. In the
uncontaminated Rhodic Cambisol, their behavior is similar - they migrate downward and
concentrate in the carbonate BCk horizon. This observation allows considering the concentration of
the heavy alkaline earth metals Ba and Sr in the surface soil horizons as a sign of irreversible or
difficult to reverse technogenic soil degradation manifested in the formation of secondary salts of
heavy metals, gradual alkalization of the environment and loss of soil colloids . |
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| ISSN: | 2534-8787 2367-9212 |