[Reduction of chlorates by acinetobacter thermotoleranticus C-1 in the presence of chromate ions].

The rate of chlorate reduction by A. thermotoleranticus C-1 reached 59.6-63.7 mg/l an hour and did not practically depend on chlorate concentration in a broad range. Chlorate and chromate being jointly present in the medium, the rate of chlorate-reduction depended on chromate concentration and remained at the same level when content of chromate reached 5 mg/l. Under CrO4(2-) of 10.0 mg/l the reduction of chlorate by A. thermotoleranticus became inconsiderably slower. The increase of CrO4(2-) content to 20.0-30.0 mg/l decreased the chlorate reduction rate from 63.7 to 18.3-5.8 mg/l an hour, and availability of 50.0 mg/l of chromate was the inhibiting concentration for chlorate destruction and led to irreversible loss of the capacity ofA. thermotoleranticus C-1 to reduce chlorate. The reduction of chromate proceeded simultaneously with that of chlorate. The rate of chromate reduction by A. thermotoleranticus C-1 under their content in the medium of 3-20 mg/l was 0.5-0.37 mg/l an hour and decreased considerably with the increase of concentration of chromate-ions. Availability of chlorate had no effect on reduction of chromate by A. thermotoleranticus C-1.