Effects of heavy metals on growth of species of Micrococcus and Pseudomonas in a crude oil/mineral salts medium

Bioassays were conducted to observe the responses of species of Micrococcus and Pseudomonas to the metals zinc, lead, copper and manganese, added singly or in combination to a crude oil/mineral salts medium. Bacterial density decreased with increasing metal ion concentration. A 50% reduction (LC 50)...

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Bibliographic Details
Published in:Bioresource technology 1998-12, Vol.66 (3), p.241-245
Main Authors: Benka-Coker, M.O., Ekundayo, J.A.
Format: Article
Language:English
Subjects:
Biodegradation of pollutants
Biological and medical sciences
Biotechnology
crude oil
Environment and pollution
Fundamental and applied biological sciences. Psychology
Growth response
heavy metals
Industrial applications and implications. Economical aspects
lethal concentrations
Micrococcus
Pseudomonas
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Summary:Bioassays were conducted to observe the responses of species of Micrococcus and Pseudomonas to the metals zinc, lead, copper and manganese, added singly or in combination to a crude oil/mineral salts medium. Bacterial density decreased with increasing metal ion concentration. A 50% reduction (LC 50) in the bacterial density of Micrococcus sp. occurred on the addition of either 0·46 μg zinc/ml, 1·41 μg lead/ml, 11·25 μg copper/ml or 28·2 μg managanese/ml. For Pseudomonas sp., the corresponding values were 0·43 μg zinc/ml, 2·80 μg lead/ml, 6·30 μg copper/ml or 317·0 μg manganese/ml. Of the metals tested, only zinc was found in higher concentrations in the oil contaminated site than the LC 50 value obtained.
ISSN:0960-8524
1873-2976
DOI:10.1016/S0960-8524(98)00057-1