Effect of pH on the toxicity and biodegradation of pentachlorophenol by Sphingomonas sp. strain P5 in nutristat culture

A polychlorinated-phenol degrading bacterium, Sphingomonas sp. strain P5, was grown in nutristat culture (i.e., a continuous culture at a controlled substrate concentration) with pentachlorophenol (PCP) as the sole carbon and energy source. During steady state conditions, the effect of the medium pH...

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Bibliographic Details
Published in:Environmental toxicology and chemistry 1998-05, Vol.17 (5), p.792-797
Main Authors: Rutgers, M. (National Institute of Public Health, Bilthoven, The Netherlands.), Bommel, S. van, Breure, A.M, Andel, J.G. van, Duetz, W.A
Format: Article
Language:English
Subjects:
ACIDIFICACION
ACIDIFICATION
BIODEGRADACION
BIODEGRADATION
Biological and medical sciences
Biotechnology
CONTAMINANTES
CONTAMINANTS
Continuous culture
Fundamental and applied biological sciences. Psychology
Methods. Procedures. Technologies
Microbial engineering. Fermentation and microbial culture technology
PENTACHLOROPHENOL
PENTACLOROFENOL
POLLUANT
POLLUTANTS
Polychlorophenol
PSEUDOMONAS
Steady state
TOXICIDAD
TOXICITE
TOXICITY
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Summary:A polychlorinated-phenol degrading bacterium, Sphingomonas sp. strain P5, was grown in nutristat culture (i.e., a continuous culture at a controlled substrate concentration) with pentachlorophenol (PCP) as the sole carbon and energy source. During steady state conditions, the effect of the medium pH on the growth of strain P5 on PCP was established. At lower pH values PCP exhibited a stronger toxicity than at higher pH values. Inhibition of the growth of strain P5 by PCP was correlated to the concentration of the undissociated phenol in the system, rather than to the dissociated or total PCP concentration. The results indicate that acidification of natural environments may enhance the toxicity of chlorophenols and suggest that treatments to increase environmental pH may reduce risk of chlorophenol toxicity at acidified sites
ISSN:0730-7268
1552-8618
DOI:10.1002/etc.5620170505