Removal of dibenzofuran, dibenzo-p-dioxin, and 2-chlorodibenzo-p-dioxin from soils inoculated with Sphingomonas sp. strain RW1

Removal of dibenzofuran, dibenzo-p-dioxin, and 2-chlorodibenzo-p-dioxin (2- CDD) (10 ppm each) from soil microcosms to final concentrations in the part s-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 or ganisms. For 2-CDD, the rate of removal was dependent on the content of soi l organic matter (SOM), with half-life values ranging from 5.8 h (0% SOM) t o 26.3 h (5.5% SOM).