NDLI: Effect of carbonyl cyanide m-chlorophenylhydrazone (CCCP) on microbial activity and polycyclic aromatic hydrocarbons (PAH) degradation in contaminated river sediments

Content Provider	Springer Nature Link
Author	Patricia Johnston, G. Kalik, Z. Johnston, C. G.
Copyright Year	2016
Abstract	Polycyclic aromatic hydrocarbons (PAHs) are of continued interest because of their carcinogenic nature and persistence in the environment. Among volatilization, sorption, and chemical oxidation, microbial degradation is the main path of PAHs disappearance. The majority of degradation studies have used pure cultures, were spiked with added PAHs, or have been performed using single pollutants. Because contaminated aquatic ecosystems retain mixtures of xenobiotics, experiments using environmental samples that incorporate the role of microbes provide more realistic conditions to study degradation. We tested the inhibitory effects of [carbonyl cyanide m-chlorophenylhydrazone (CCCP)] on microbial respiration, which in turn altered PAH degradation. In this study, 3.5 mM of CCCP (two orders of magnitude higher to what was needed to inhibit growth of E. coli in pure culture) was shown to inhibit respiration of indigenous microbes in complex sediment samples by 79 % at 25 °C and 64 % at 37 °C. After 15 days of incubation sediment slurries without CCCP showed higher PAH degradation rates (between 60 and 90 %) compared to sediment slurries with CCCP, which showed much lower degradation rates (<40 %). This study also reported the highest recorded rates of INT reduction (29 nkat/g) due to both short incubation times and the potential to stimulate high microbial activity in the sediments. These data indicated the effectiveness of CCCP as a microbial respiratory inhibitor in sediments, and that indigenous microbes in long-term PAH contaminated anaerobic sediments can be stimulated to degrade PAHs present in their environment.
Starting Page	1
Ending Page	9
Page Count	9
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	75
Issue Number	9
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-04-25
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Microbial activity Dehydrogenases CCCP PAHs INT Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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