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Table 1 Concentration of Cu, Pb and Zn and total heterotrophic bacteria count (THBC) of the soil samples. The metal concentration and bacteria count are per fresh weight of soil. SEO Spent engine oil

From: Bacteria from spent engine-oil-contaminated soils possess dual tolerance to hydrocarbon and heavy metals, and degrade spent oil in the presence of copper, lead, zinc and combinations thereof

Sample

Metal concentration (mg kg-1)

THBC a (log CFU g-1)

Cu

Pb

Zn

Orogun I

290.6

93.1

799.5

4.48 (1.00)

Bodija

100.9

83.0

550.0

4.67 (0 .48)

Orogun II

80.0

67.6

426.7

5.02 (0.55)

Ojoo

76.2

70.6

741.6

4.98 (1.00)

Agbowo

71.7

62.2

901.1

4.92 (0.50)

Research farm

19.9

11.6

85.0

5.17 (0 .89)

Botanical garden

10.2

0.00

50.8

5.09 (0.50)

SEOb

6.2

843.0

147.0

NDc

  1. aEach count is a mean of two replicates with the standard error in bracket
  2. bSpent oil is not a soil sample
  3. cNot determined
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Annals of Microbiology

ISSN: 1869-2044

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