Microbial transformation of pentachloronitrobenzene under nitrate reducing conditions

Biodegradation
Didem Okutman Tas, Spyros G Pavlostathis

Abstract

The effect of pentachloronitrobenzene (PCNB) on denitrification was assessed with two denitrifying cultures (PCNB-free control and PCNB-acclimated) developed from a contaminated estuarine sediment. PCNB was transformed to pentachloroaniline (PCA) in the PCNB-acclimated culture repeatedly amended with 0.1 muM PCNB, but further dechlorination or degradation of PCA was not observed for almost 1 year. The effect of PCNB on denitrification was also investigated with the PCNB-free control culture. PCNB at an initial concentration of 13 muM was transformed to PCA simultaneously with nitrate reduction but only after the nitrate concentration was at or below 20 mg N/l. PCNB addition at an initial concentration of 13 muM to the control denitrifying culture developed as PCNB-free culture resulted in a transient accumulation of nitric oxide (NO) and nitrous oxide (N(2)O). Similarly to the PCNB-acclimated culture, PCNB transformation to PCA started when the nitrate concentration decreased to about 20 mg N/l. A low degree of nitro group removal resulting in the formation of pentachlorobenzene (PeCB) was also observed in the control culture when amended with 13 muM PCNB. Further transformation or degradation of PCA was not observed in all cul...Continue Reading

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Citations

Feb 15, 2012·Applied Microbiology and Biotechnology·Pankaj Kumar AroraCh Venkata Ramana
Mar 12, 2013·Journal of Environmental Management·Ying Ying Li, Hong Yang
Dec 3, 2014·Bioresource Technology·Gamze OzdemirDidem Okutman Tas
May 1, 2019·Environmental Geochemistry and Health·Ming LiYong Yu

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