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A study of uranium distribution in soils and plants was conducted over the Crucea area (northern Romania). The elements most susceptible to HNO3 extraction (more than 65%) are cobalt, copper, nickel, lead, and zinc; less extractable are elements such as barium, chromium, strontium, and vanadium. Uranium and thorium show a relatively high percentage of extraction, e.g., 50.7 and 55.7%, respectively. Generally, high correlation coefficients exist between total and partial extractions. The highest correlation coefficients (r > 0.90) are for uranium, cobalt, copper, nickel, lead, and zinc. Analyses of the forest vegetation indicated that, in general, uranium is preferentially concentrated in the roots, followed by the twigs and leaves. Higher values of uranium content in plant samples from Crucea ore deposit area may be correlated with higher uranium contents in the soil and rock samples from this area. The study indicates that fir Abies alba has higher uptake of uranium than any other vegetation species present in this area.
Lucian Petrescu is an assistant professor of geochemistry in the Department of Mineralogy at Bucharest University. He received his M.Sc. degree (1999) and his Ph.D. (2003) from Bucharest University.Essaïd Bilal is a professor of geochemistry and the head of the Chemistry Department in Ecole Nationale Supérieure des Mines de Saint Etienne. He was conferred the honorary degree Docteur Honoris Causa de l'Université de Bucarest in Romania in 2000. He is a member of the New York Academy of Sciences, Society of Geology of France, and the Geology Brazilian Society among other.