Inhibition of hydrocarbon bioremediation by lead in a crude oil-contaminated soil

Analyses of soil samples revealed that the level of lead (total or bioavailable) was three-fold greater in crude oil contaminated than in uncontaminated Kuwaiti soils. Investigation of the possible inhibitory effect of lead on hydrocarbon degradation by the soil microbiota showed that the number of...

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Bibliographic Details
Published inInternational biodeterioration & biodegradation Vol. 56; no. 1; pp. 1 - 7
Main Authors AL-Saleh, Esmaeil S., Obuekwe, Christian
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.07.2005
Subjects
Bioremediation
hydrocarbon-degrading bacteria
Hydrocarbons
lead
Metal pollution
Mineralization
petroleum
polluted soils
soil bacteria
soil pollution
soil toxicity
Hydrocarbons
Bioremediation
Mineralization
Metal pollution
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Summary:Analyses of soil samples revealed that the level of lead (total or bioavailable) was three-fold greater in crude oil contaminated than in uncontaminated Kuwaiti soils. Investigation of the possible inhibitory effect of lead on hydrocarbon degradation by the soil microbiota showed that the number of hydrocarbon-degrading bacteria decreased with increased levels of lead nitrate added to soil samples, whether oil polluted or not. At 1.0 mg lead nitrate g −1 dry soil, the number of degraders of hexadecane, naphthalene and crude oil declined by 14%, 23% and 53%, respectively. In a similar manner, the degradation and mineralization of different hydrocarbons decreased with increased lead content in cultures, although the decreases were not significantly different ( P > 0.05 ). The dehydrogenase activities of soil samples containing hydrocarbons as substrates also declined with an increase in the lead content of soil samples.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:0964-8305
1879-0208
DOI:10.1016/j.ibiod.2004.11.003