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Kolo BG
Kolo BG
Nigeria
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Research Article
Uptake and Reduction of Hexavalent Chromium by Aspergillus niger and Aspergillus parasiticus
Author(s): Shugaba A, Buba F, Kolo BG, Nok AJ, Ameh DA and Lori JAShugaba A, Buba F, Kolo BG, Nok AJ, Ameh DA and Lori JA
The uptake and reduction of Cr(VI) by Aspergillus niger and A. parasiticus was studied. After 96 hours of growth, the culture solutions spiked with an initial dichromate concentration of 20 mg/l, were completely decolorized and had residual Cr(VI) concentrations of only 0.74 ± 0.55 and 1.69 ± 0.29 mg/l in A. niger and A. parasiticus cultures representing Cr(VI) removal of 96.3% and 91.6%, respectively. In the A. niger culture, significantly (P < 0.01) lower Cr(VI) concentrations were observed within 72 hours of growth compared to those of A. parasiticus, but in both cultures complete removal was almost achieved by 144 hours of growth. The rate of Cr(VI) removal was 0.21 ± 0.09 mgl-1hr-1 and 0.20 ± 0.07 mgl-1hr-1 for A. niger and A. parasiticus, respectively. Cellular concentrations of Cr(VI) in the two fungi increased significantly (P < 0.05 – 0.001) wi.. View More»
DOI: 10.4172/2157-7463.1000119