Biosorption Potency of Aspergillus niger for Removal of Chromium (VI)

Aspergillus niger isolated from soil and effluent of leather tanning mills had higher activity to remove chromium. The potency of Aspergillus niger was evaluated in shake flask culture by absorption of chromium at pH 6 and temperature 30°C. The results of the study indicated removal of more than 75%...

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Bibliographic Details
Published in:Current microbiology 2006-09, Vol.53 (3), p.232-237
Main Authors: Srivastava, Shaili, Thakur, Indu Shekhar
Format: Article
Language:English
Subjects:
Aspergillus niger
Aspergillus niger - metabolism
Aspergillus niger - ultrastructure
Atomic absorption spectrophotometry
Bacteria
Chromium
Chromium - metabolism
Hydrogen-Ion Concentration
Microscopy, Electron, Scanning - methods
Microscopy, Electron, Transmission - methods
Oxidation-Reduction
Scanning electron microscopy
Spectral analysis
Spectrophotometry
Temperature
X-ray spectroscopy
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Summary:Aspergillus niger isolated from soil and effluent of leather tanning mills had higher activity to remove chromium. The potency of Aspergillus niger was evaluated in shake flask culture by absorption of chromium at pH 6 and temperature 30°C. The results of the study indicated removal of more than 75% chromium by Aspergillus niger determined by diphenylcarbazide colorimetric assay and atomic absorption spectrophotometry after 7 days. Study of microbial Cr(VI) reduction and identification of reduction intermediates has been hindered by the lack of analytical techniques that can identify the oxidation state with subcellular spatial resolution. Therefore, removal of chromium was further substantiated by transmission electron microscopy (TEM), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX), which indicated an accumulation of chromium in the fungal mycelium.
ISSN:0343-8651
1432-0991
DOI:10.1007/s00284-006-0103-9