Title of article :
Usefulness of the Sensitivity–Resistance Index to Estimate the Toxicity of Copper on Bacteria in Copper-Contaminated Soils
Author/Authors :
Takashi Kunito، نويسنده , , Keishi Senoo، نويسنده , , Kazutoshi Saeki، نويسنده , , Hiroshi Oyaizu، نويسنده , , Masaya Nishiyama and Satoshi Matsumoto ، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 1999
Pages :
8
From page :
182
To page :
189
Abstract :
Examination was made of the fluctuations of numbers of the total bacteria and copper (Cu)-resistant bacteria with soluble/exchangeable Cu (Ex-Cu) fraction in three types of soils spiked with Cu at four concentrations. Drastic increase in Cu-resistant bacteria was observed in three soils spiked with 20 mmol Cu kg−1 after 2 weeks of incubation, indicating the strong selection of individuals originally resistant to Cu. Adaptation and proliferation of bacteria were also observed in the soil environment under the long-term exposure to extremely high concentration of Cu (800 mg kg−1 soil of Ex-Cu), deriving from the development of Cu resistance. These bacterial fluctuations and the toxic effects of Cu depended on soil types, due to the chemical forms in which Cu occurs. It was also found that the ratio of Cu-resistant bacterial number to total bacteria was significantly correlated with the amount of Ex-Cu in the soils. This sensitivity-resistance index seems to be useful for evaluating the toxic effects of Cu on the soil bacterial community. Whereas the toxicity of Cu depended on the soil properties, they also changed with time. This phenomenon can be explained by the decrease in the most labile Cu phase, Ex-Cu, with time in the soils.
Keywords :
contamination , copper , soil , toxicity , heavy metal
Journal title :
Ecotoxicology and Environmental Safety
Serial Year :
1999
Journal title :
Ecotoxicology and Environmental Safety
Record number :
710207
Link To Document :
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