Influence of heavy metals on Acinetobacter thermotoleranticus C-1 was studied by the rate of chlorate reduction and biomass growth. It was established that Fe3+ in a form of free ion at concentration of 30 mg/l also stimulates both the reduction of chlorate by A. thermotoleranticus C-1 and the growth of biomass, Cd2+ Pb2+ and Mn2+ do not practically affect the process velocity or stimulate it a little, Cu2+ and Zn2+ lower the reduction rate of C10(3)- 2.5-3 times, under these conditions the biomass growth is inhibited more weakly than the reduction rate. Nickel and cobalt in the mentioned amount inhibit completely the process of reduction. Metals in the form of hydroxide-ion proved to be less toxic for str. C-1, than their ion forms. General influence of a free ion, metal hydroxide and the amount of organic nutrition takes more considerable (stimulating or inhibiting) influence on the process, than each of these factors itself.
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