CONTRIBUŢII LA STUDIUL DISTRIBUŢIEI METALELOR GRELE (Cd; Pb) DINTR-UN CERNOZIOM CAMBIC DIN PERIMETRUL HUDEŞTI, JUDEŢUL BOTOŞANI

The ratio of heavy metals speciation forms is very sensitive to the physic -chemical factors variation, and this bear to a permanent modification of the distribution between minerals phases and soil solution, and between mineral phases from soil, respectively. From our point of view, the heavy metals distribution in soil is determined, essentially, by the evolution of equilibrium between mineral phases and soil solution, and between mineral phases of soil, respectively, in ration with the amplitude and the physic-chemical factors variation ratio. Our study, try to bring a few arguments for the elaboration of some possible distribution mechanisms of cadmium and lead, in supergene conditions. Basis both, ours experimental results (obtained by mineralogical and geochemical studies of some soil samples and by experimental modeling of inter-phases distribution of some heavy metals), and the results from literature, we have evaluated the distributions tendency for cadmium and lead, according with the multiphase- multi components model, for the particular case of the soils from the Hudesti perimeter, Botosani county.