Abstract
Seven Cu-contaminated soils were measured for the number of bacteria grown on agar plates containing various concentrations of Cu, total Cu contents, and DTPA-extractable Cu contents. The relationship between the bacterial number grown on agar plates and concentration of Cu in the agar plates (0-1.5 mM) was well fitted to Duxbury's exponential equation. Total bacterial numbers in the soils positively correlated with the B values in the equation. The B value seemed to be a better index of biotoxic Cu amount in soil than DTPA-extractable Cu of soil. We offer a modification of Duxbury's exponential equation, in which the B value can be estimated once total soil bacterial number was counted.
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