Abstract:
:Extracellular polymeric substances (EPS) were extracted from Aspergillus fumigatus using cationic exchange resin technique. The EPS were mainly composed of polysaccharide and low quantities of protein and nucleic acid. Biosorption of Cd(II), Pb(II), and Cu(II) of EPS was investigated as a function of pH using differential pulse polarography and the Ruzic model. Results showed that the EPS biosorption capacity determined using either the direct titration curves i = f(C M) or the method proposed by Ruzic (Analytica Chimica Acta 140:99-113, 1982) were coincident. Cu(II) had the highest affinity with EPS followed by Pb(II) and Cd(II). The total number of binding sites for Cu(II) and Cd(II) increased with pH in the range of 4.0-7.0. Similar trend was observed for Pb(II) at pH 4.0-5.0, while precipitates were observed at pH 6.0 and 7.0. The conditional binding constants of these three metals displayed low levels of fluctuation with pH and ranged from 4.02 ± 0.02 to 5.54 ± 0.05.
journal_name
Environ Monit Assessjournal_title
Environmental monitoring and assessmentauthors
Yin Y,Hu Y,Xiong Fdoi
10.1007/s10661-013-3059-9subject
Has Abstractpub_date
2013-08-01 00:00:00pages
6713-8issue
8eissn
0167-6369issn
1573-2959journal_volume
185pub_type
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