Assessment of ecotoxicity of the bismuth by biological indicators of soil condition

The present study was performed for the ecotoxicity assessment of bismuth (Bi) effect on biological indicators soil condition: total number bacteria, catalase activity, dehydrogenases activity and germination Radish seeds length roots. Three types with significantly different resistance ability to heavy metal pollution were studied: Haplic Chernozems Calcic, Arenosols Eutric Cambisols Eutric.Soil contamination Bi simulated in lab (3, 30 300 mg kg-1 dry weight). Changes parameters assessed at 10 day treatment. data obtained showed that soils contaminated South Russia generally characterized by oppression properties. bacteria enzymatic (catalase dehydrogenases) decreased over contamination. phytotoxicity (germination radish seeds) increase when 3 is added soil. degree deterioration properties depends concentration period time after onset pollution. Resistance can be described following decreasing series: Chernozem Calcic > Eutric. regional maximum permissible concentrations (rMPC) have been proposed: – 8.5 kg-1, 2.2 1.8 kg-1.