[Heavy metals in soils of floodplain ecosystems of the Lucoml lake-river complex]
Savchenko, S.V. | Golovatyj, S.E. | Bazhenova, N.M. | Samsonenko, I.P.(Institute for Problems of Natural Resources Use and Ecology, Minsk (Belarus))
Field investigations were carried out in summer of 2003. The total forms of heavy metals (Cr, Ni, Co, Cu, Pb, zn, Cd, Mn) were analyzed by the method of chemical extraction by a mixture of acids (HF, HNO3, HCI, HClO4). Mobile compounds of metals were evaluated by IM HCI extraction using atomic-absorption method. Basic contamination of soils of the Lukomka-river floodplain are Cr, Cu, Cd, Ni and Zn. In spatial distribution of metals there is insignificant increase in soils of the central floodplain downstream the river of total concentration of Mn -1,9 times, Pb - 1,7, Zn - 1,6, Cu - 1,5, Cr - 1,4 times. The contents of mobile forms also increased in the downstream: Mn - 2,1 times, Cu - 1,9, Pb - 1,8, Ni - 1,5, Cr - 1,2 times. Floodplain soils of the Tsitranka-river are characterized by the increased content of total Cd and Cr in the central floodplain and near the river-bed, as well as by the formation of multi element anomaly of mobile forms in soils near the river-bed, where the contents of Cr, Cu, Ni exceeds maximum accepted levels 1,2...3,1 times. This confirms the prevalence of pollution of water-flow genesis. Facieses distinctions in accumulation of elements in soils of this site are insignificant. The factors of accumulation for the total contents of elements make up 1,2...1,7
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