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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/791

Title: A comparison of the ability of forest and agricultural soils to mineralize chlorinated aromatic compounds
Authors: Fulthorpe, Roberta
Schofield, Linda
Keywords: Atrazine ; biodegradation ; chlorophenolics ; 2,4-D ; PCP ; pristine soils
Issue Date: 1999
Publisher: Kluwer Academic Publishers
Citation: Biodegradation 10: 235-244, 1999
Abstract: Soils were sampled from two agricultural fields, two relatively pristine forests, and one suburban forest in Ontario, Canada. The ability of these soils to mineralize 2,4-dichlorophenoxyacetate, 3-chlorobenzoate, 4-chlorophenol, 2,4-dichlorophenol, pentachlorophenol, and atrazine was determined using <math coding="latex" type="inline">^14C-labeled substrates. Direct preexposure was necessary before atrazine mineralization could be detected; however, it was not necessary for degradation of any of the other chemicals. 2,4-dichlorophenoxyacetate and pentachlorophenol mineralization was much higher in the agricultural soils relative to the pristine forest soils, but 3-chlorobenzoate and 2,4-dichlorophenol mineralization rates showed the opposite trend. Mineralization of 4-chlorophenol was about equivalent in all soils. Suburban forests soils were indistinguishable from agricultural soils with respect to their degradation of 2,4-dichlorophenoxyacetate and chlorobenzoate. Additionally, they were better able than any of the soils to withstand the toxic effects of pentachlorophenol. Pentachlorophenol mineralization was highly variable in the pristine forest soils, ranging from about 6 to 50%. Abiotic factors such as pH, soil type, and organic and moisture content did not account for these significant site differences. The selective forces responsible for these differences, and the possible differences in microbial populations are discussed.
URI: http://hdl.handle.net/1807/791
Appears in Collections:Biology

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