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Applied and Environmental Microbiology, May 1999, p. 2246-2249, Vol. 65, No. 5
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Removal of Dibenzofuran, Dibenzo-p-Dioxin, and 2-Chlorodibenzo-p-Dioxin from Soils Inoculated with Sphingomonas sp. Strain RW1

Rolf U. Halden,dagger Barbara G. Halden,dagger and Daryl F. Dwyer*

Department of Civil Engineering, University of Minnesota, Minneapolis, Minnesota 55455

Received 19 January 1999/Accepted 23 February 1999

Removal of dibenzofuran, dibenzo-p-dioxin, and 2-chlorodibenzo-p-dioxin (2-CDD) (10 ppm each) from soil microcosms to final concentrations in the parts-per-billion range was affected by the addition of Sphingomonas sp. strain RW1. Rates and extents of removal were influenced by the density of RW1 organisms. For 2-CDD, the rate of removal was dependent on the content of soil organic matter (SOM), with half-life values ranging from 5.8 h (0% SOM) to 26.3 h (5.5% SOM).

* Corresponding author. Mailing address: Department of Civil Engineering, 122 Civil Engineering Building, University of Minnesota, 500 Pillsbury Dr., S.E., Minneapolis, MN 55455. Phone: (612) 625-8582. Fax: (612) 626-7750. E-mail: dwyer003{at}tc.umn.edu.

dagger Present address: Lawrence Livermore National Laboratory, Environmental Restoration Division, Livermore, CA 94550.

Applied and Environmental Microbiology, May 1999, p. 2246-2249, Vol. 65, No. 5
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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