V.R. Klos1,2, https://orcid.org/0009-0009-2965-0916
N.O. Kryuchenko2, nataliya.kryuchenko@gmail.com, https://orcid.org/0000-0001-8774-9089
M.A. Smyrnyi2, https://orcid.org/0009-0000-1274-6596
1 State Enterprise “Ukrainian Geological Company”, 02088, Geofizykiv Str., 10, Kyiv, Ukraine;
2 M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the National Academy of Sciences of Ukraine 34, Acad. Palladina Ave., Kyiv, Ukraine, 03142
https://doi.org/10.15407/gof.2025.46.072
The content of silver (gross and mobile forms) and organic matter in agricultural and pasture soils contaminated with sewage sludge from the Bortnytsia aeration station and conditionally “clean” soils of the Kyiv region was determined. Gross Ag concentrations were determined by approximate quantitative spectral analysis, mobile forms by atomic absorption, and organic matter content by volumetric chemical analysis.
The background content of gross (0.14 mg/kg) and mobile forms (0.000125 mg/kg) of silver in the soils of the region was established. An inverse correlation (R2 0.8) was found between the content of gross and mobile forms in the soils of contaminated agricultural and pasture lands, and a direct linear correlation (R2 0.8) in the soils of conditionally “clean” areas. It was found that silts have the highest gross silver content — 6.7 mg/kg and the highest organic matter content — 20.6%, while soils of contaminated agricultural and pasture lands have approximately the same silver content (4—5 mg/kg) and organic matter — 4.2—4.4%; conditionally “clean” areas are characterized by the lowest silver content (0.11—0.18 mg/kg) and the lowest organic matter content (1.3—2.1%).
It has been established that the highest percentage of mobile silver forms is observed in the soils of conditionally “clean” pasture lands — 0.18%, while the lowest percentage is characteristic of silt fields — 0.003%, which is due to the fact that humic acids bind most silver complexes well. It was found that in contaminated agricultural soils, the content of mobile forms of silver is 4 times higher (0.00207 mg/kg) than in soils on pasture lands, easily soluble (mobile) forms of silver are most accessible to plants.
Keywords: silver (total content and mobile forms), organic matter, contaminated soils, conditionally “clean” soils, sewage sludge fields.
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