Geochemical pattern of soils in Bobovdol valley, Bulgaria. Assessment of Cd and Co contents

Year 2016, Volume: 5 Issue: 3, 172 - 181, 20.06.2016

Ivona Nikova Venera Tsolova Bisser Hristov Aleksandar Zdravkov Kalin Ruskov

https://doi.org/10.18393/ejss.2016.3.172-181

Cited By: 1

Abstract

The chemical composition of soils spread in the Bobov dol valley was studied in order to reveal the natural and anthropogenic patterns of Cd and Co spatial distribution. A sampling procedure based on the irregular grid of points and validated analytical methods were used in the field and laboratory studies. It is found that Cd content varies from 0.21 to 0.90 mg kg^-1 in studied soils and the average value of 0.55 mg kg^-1 coincides with concentration demarcating soil pollution (0.5 mg kg^-1). Co content ranges from 2.22 to 15.76 mg kg^-1 and in 70 % of sampled points exceeds the natural background content of 7.8 mg kg^-1 found in local rocks. Still, Cd enrichment of studied soils is more significant than Co’s with coefficient of Clarke concentration of 3.67. Hence, the secondary deposition of studied elements as a result of the Bobov dol Thermal power plant air emissions is verified by results obtained. The spatial distribution of Cd and Co is featured with an altitudinal gradient in deposition and a trend of quantitative depletion in the South of Plant. Soil organic matter and pH have no influence on the content and spatial distribution of studied elements. Elements iron affinity governs their geochemical linkage in soils although cobalt occurs allied with aluminum and titanium.

Keywords

Soils, trace elements, Bobov dol, spatial distribution, background content

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