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Tolerance of Escherichia coli to Cadmium¹

ABSTRACT

The effect of Cd on Escherichia coli was studied by measuring the quantity of ¹⁴CO₂ produced from ¹⁴C-glucose by the organism in the presence of increasing amounts of Cd. The test medium was a simulated fresh-water source consisting of 0.01% soy peptone in sterile, deionized water (pH 6). Decimal dilutions of Cd, as CdCl₂, had no effect on the ability of the organism to produce ¹⁴CO₂ in concentrations ranging from 0.006 µg Cd/liter to 0.6 mg Cd/liter. At 6 mg Cd/liter a decrease in ¹⁴CO₂ production was noticed, and a higher concentration of Cd reduced ¹⁴CO₂ evolution even further. The decrease in ¹⁴CO₂ evolution by E. coli could be correlated with a decrease in the number of cells surviving the Cd treatments.

Key Words: CO₂ • radiometric technique • toxicity

¹ Contribution from Johnston Laboratories, Inc., Cockeysville, Maryland.

² Senior Microbiologist, Johnston Laboratories, Inc., Cockeysville, Maryland 21030.

Received for publication August 15, 1972.