Distribution of Cu-resistant and Non-resistant Bacteria in Several Cu-contaminated Soils in Japan: Usefulness of the Tolerance Level as an Index of Cu Contamination in Soil
1997
Kunito, Takashi | Senoo, Keishi | Nagaoka, Kazunari | Oyaizu, Hiroshi | Matsumoto, Satoshi
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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