p. 193 - 200 PRELIMINARY DATA ON UPTAKE EXPERIMENTS OF 131 I, 134 Cs AND 89 Sr BY Cystoseira barbata AT THE ROMANIAN COAST OF THE BLACK SEA Alexandru S. Bologa 1)and Doina Balaban 2) 1)Romanian Marine Research Institute Constanta 2)Antiepidemic sanitary Center Constanta Abstract The following maximum concentration factors were experimentally determined in the brown alga Cystoseira barbata: for 131 I, CF=321 (August); for 134 Cs, CF=30 (June); and for 89 Sr, CF=9 (June, August)