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KINETICS OF PCB MICROBIAL DECHLORINATION EXPLAINED BY FREELY DISSOLVED CONCENTRATION IN SEDIMENT MICROCOSMS
Needham, T.P., R.B. Payne, K.R. Sowers, and U. Ghosh.
Environmental Science & Technology 53(13):7432-7441(2019)

This study used passive dosing/sampling to predict and measure the biological dechlorination rate of PCB 61 to PCB 23 by an organohalide-respiring bacterium, Dehalobium chlorocoercia. The rate of dechlorination was linearly dependent on the freely dissolved concentration of PCB 61 both in sediment and in sediment-free microcosms. The observed rate of dechlorination in sediment microcosms was predicted within a factor of 2 based on the kinetics measured in sediment-free microcosms. A threshold for dechlorination was not observed down to an aqueous concentration of about 1 ng/L PCB 61.



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