Abstract:
:Metal uptake potentials of Pseudomonas aeruginosa CA207Ni, Burkholderia cepacia CA96Co, Rhodococcus sp. AL03Ni, and Corynebacterium kutscheri FL108Hg were studied to determine their competence in detoxification of toxic metals during growth. Metabolism-dependent metal biouptake of the bacteria revealed appreciable uptake of the metals (57-61, 10-30, 23-60, and 10-16 mg g dw(-1) of Ni(2+), Cr(6+), Co(2+), and Cd(2+), respectively) from medium, after initial drop in pH, without lag phase. The bacteria exhibited 95-100% removal efficiency for the metals from aqueous medium as 21 (±0.8)-84 (±2.0) concentration factors of the metals were transported into the bacterial systems. Passive adsorption onto the cell surfaces occurred within 2-h contact, and afterwards, there was continuous accumulation for 12 days. Biosorption data of the bacteria were only fitted into Langmuir isotherm model when strains AL96Co, CA207Ni, and AL03Ni interacted with Ni(2+), achieving maximum uptake of 9.87, 2.72, and 2.69 mg g dw(-1), respectively. This study established that the actively growing bacterial strains displayed, at least, 97.0% (±1.5) continuous active removals of metals upon adsorption. The bacteria would be good candidates for designing bioreactor useful in the detoxification campaign of heavy metal-polluted systems.
journal_name
Environ Monit Assessjournal_title
Environmental monitoring and assessmentauthors
Oyetibo GO,Ilori MO,Obayori OS,Amund OOdoi
10.1007/s10661-015-4731-zsubject
Has Abstractpub_date
2015-08-01 00:00:00pages
525issue
8eissn
0167-6369issn
1573-2959journal_volume
187pub_type
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