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Indian Journal of Experimental Biology (IJEB) >
IJEB Vol.44 [2006] >
IJEB Vol.44(01) [January 2006] >
| Title: | Biosorption of Ni, Cr and Cd by metal tolerant Aspergillus niger and Penicillium sp. using single and multi-metal solution |
| Authors: | Ahmad, Iqbal
Ansari, Mohd Ikram
Aqil, Farrukh |
| Keywords: | Aspergillus
Filamentous fungi
Metal biosorption
Metal tolerance
Penicillium |
| Issue Date: | Jan-2006 |
| Publisher: | CSIR |
| Abstract: | Fungi including Aspergillus and Penicillium, resistant
to Ni2+, Cd2+, and Cr6+ were isolated from
soil receiving long-term application of municipal wastewater mix with untreated
industrial effluents of Aligarh, India. Metal tolerance in term of minimum
inhibitory concentration (MIC) was 125-550 μg/ml for Cd, 300-850 μg/ml for Ni
and 300-600 μg/ml for Cr against test fungi. Two isolates, Aspergillus niger and
Penicillium sp. were tested for their Cr, Ni and Cd biosorption potential
using alkali treated, dried and powdered mycelium. Biosorption experiment was conducted in 100 ml of solution at
three initial metal concentrations i.e., 2, 4 and 6 mM with contact time (18 hr) and pretreated fungal biomass (0.1g) at
25°C. Biosorption of all metals was found higher at 4 mM initial metal concentration as
compared to biosorption at 2 and 6 mM
concentrations. At 4 mM initial metal
concentration, chromium biosorption was 18.05 and 19.3 mg/g of Aspergillus and Penicillium biomasses, respectively. Similarly, biosorption of Cd
and Ni ions was also maximum at 4 mM
initial metal concentration by Aspergillus
(19.4 mg/g for Cd and 25.05 mg/g of biomass for Ni) and Penicillium (18.6 mg/g for Cd and 17.9
mg/g of biomass for Ni). In general, biosorption of metal was influenced by
initial metal concentration and type of the test fungi. The results indicated
that fungi of metal contaminated soil have high level of metal tolerance and
biosorption properties. |
| Page(s): | 73-76 |
| ISSN: | 0975-1009 (Online); 0019-5189 (Print) |
| Source: | IJEB Vol.44(01) [January 2006]
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