УДК 550.42 • Issue 28 / 2019 • 33-46 pages
G. Bondarenko, L. Kononenko, O.Vysotenko, V. Mаnіchev, S. Кuzеnko
Experimental study of technogenic zinc and lead species in chernozem soil in the zone of influence of the ‘Ukrtsink’ plant has been carried out. The earlier reconstruction of technogenic lead transformation dynamics was confirmed to be correct by the results of the study. This reconstruction has predicted that accumulation of the mobile lead species at high degree of contamination (> 1000 mg/kg) occurs so intensely that the soil’s ability to immobilize the pollutant is exhausted, and thus the soil loses its natural ability to heal itself. The study of technogenic zinc and lead species in chernozem soil under very intensive, severe pollution (more than 2000 mg/kg) showed that there is practically no immobilization of zinc in chernozem, immobilization of lead is very limited. An intense vertical migration of technogenic pollutants has been shown to take place in the chernozem soil with a high degree of HM contamination – at a depth of 20-30 cm, Zn concentrations was noted at the level of 2-4 g/kg, and Pb – 250-375 mg/kg. The research results showed a linear dependence of the grass vegetation pollution by technogenic Zn on the content of mobile Zn in the soil. The technogenic Pb pollution of vegetation deviates from the linear dependence on the content of mobile Pb, its absorption by plants is somewhat less intense than in the case of Zn. This difference can be explained by the different roles of these metals in the vital activity of plants. The vegetation in areas characterized by a high content of HM mobile species at a depth of more than 10 cm, was found to be the most polluted by Zn and Pb. This may indicate that soil solutions from deep soil layers enriched with mobile species of these metals are a significant source of contamination of the herbaceous vegetation of HM.
Key words: heavy metals, mobile species, dynamics, vertical migration, immobilization.
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