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Chromium (Vi) Reduction By Streptococcus Species Isolated From The Industrial Area Of Abeokuta, Ogun State, Nigeria
P. A. Wani, Ibrahim Odunola Zainab, Idris Adegbite Wasiu, Kuranga Oluropo Ja
Published 2015 · Biology
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Chromium (VI) contamination has accelerated due to rapid industrialization worldwide. Aim of this study is to check the bacterial species for their tolerance towards multiple metals, antibiotics and plant growth promoting activity and further check whether these bacteria are reducing Cr (VI). Bacterial strains were isolated from metal contaminated soils of Abeokuta. All of the isolates showed tolerance to lead, zinc and chromium (VI). Bacterial specie also showed tolerance towards antibiotics, 100% of the isolates were tolerant to Septrin, Chloramphenicol, Sparfloxacin, Amoxicillin, Augmentin, Tarivid and Streptomycin, whereas 83.33% were tolerant to Gentamycin and Pefloxacin and 33.33% were resistant to Ciprofloxacin. All bacterial species were positive to ammonia, whereas strain PZ3 and PZ4 were found to be positive to HCN. Among all the strains, only Streptococcus spp. PZ4 showed reduction of Chromium (VI). Maximum reduction (85%) of chromium (VI) was observed at pH 7 by Streptococcus spp. PZ4. Similarly, Streptococcus spp. PZ4 reduced the chromium considerably at pH 5 (51.25%), pH 6 (72.5%), pH 8 (67.5%) and at pH 9 (45%), at a concentration of 100 μg Cr mLG after 120 h of incubation. Streptococcus spp. PZ4 1 reduced chromium (VI) at a concentration of 50 μg Cr mLG (47.5%), 100 μg Cr mLG (91.25%) and 1 1 150 μg Cr mLG (134.17%). Due to above properties strains could therefore be used as 1 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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