Investigation of the vertical distribution of major and trace elements in Matita Lake (Danube Delta) sediments by activation analysis

The vertical profiles of two major elements (Na and Ca) and 24 trace elemen ts (Rb, Cs, Sr, Ba, Sc, La, Ce, Sm, Eu, Tb, Yb, Lu, Th, U, Hf, Nh, Ta Cr, F e, Co, Zn, As, Sb and Br) have been investigated by neutron activation anal ysis in a 2.5 m core collected from the Danube Delta, Matita Lake. The data have been correlated with the concentrations of five major minerals (calci te, dolomite, feldspar, clay and quartz) as determined by X-ray diffraction . This study revealed the presence of As, Sb and Br as pollutant microeleme nts.