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Journal of Environmental Science and Technology

Year: 2015 | Volume: 8 | Issue: 3 | Page No.: 122-130
DOI: 10.3923/jest.2015.122.130
Bioreduction of Cr (VI) by Heavy Metal Resistant Pseudomonas Species
Parvaze Ahmad Wani and Ogunbiyi Haruna Ayoola

Abstract: Chromium (VI) contamination has accelerated due to rapid industrialization worldwide. Aim of this study was to check the bacterial species for their tolerance towards multiple metals, antibiotics and further check whether these bacteria are reducing Cr (VI). Bacterial strains were isolated from the industrial area situated at Lagos-Abeokuta Road, Ile Ise Awo, Abeokuta, Ogun State, Nigeria. All of the isolates showed tolerance to lead, zinc and chromium (VI). Bacterial species also showed tolerance towards antibiotics, 100% of strains were resistant to ampicillin, cotrimoxazole, colistin and gentamycin, 66.6% to nitrofurantoin and nalidixic acid, 83.3% were resistant to streptomycin whereas, 50% were resistant to tetracycline. Among all the strains, only two strains Pseudomonas strain PH2 and PH4 were chosen for chromium (VI) reduction as these strains showed maximum tolerance towards chromium (VI). Maximum reduction (60%) of chromium (VI) was observed at pH 6 by Pseudomonas spp. PH2, which was followed by pH 5 (50%) whereas, pH9 showed least reduction of 12.5%. Similarly, Pseudomonas spp. PH4 also reduced chromium considerably at pH 6 (60%), pH 5 (50%), pH 8 (37.5%) and at pH 9 (12.5%) respectively, at a concentration of 100 μg Cr mL-1 after 120 h of incubation. The Pseudomonas species PH2 reduced chromium (VI) at concentration of 50 μg Cr mL-1 (92%), 100 μg Cr mL-1 (70%) and 150 μg Cr mL-1 (50%), respectively at a pH of 6. Similarly, Pseudomonas species PH4 reduced chromium (VI) by 95% at 50 μg Cr mL-1, 70% at 100 μg Cr mL-1 and 55% at 150 μg Cr mL-1 at a pH of 6. Due to above properties strains could therefore, be used as bioremediators of metals in soils contaminated with heavy metals and can also increase the yield of various crops under heavy metal contamination.

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How to cite this article
Parvaze Ahmad Wani and Ogunbiyi Haruna Ayoola, 2015. Bioreduction of Cr (VI) by Heavy Metal Resistant Pseudomonas Species. Journal of Environmental Science and Technology, 8: 122-130.

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