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Cr(VI) sorption by intact and dehydratedCandida utiliscells in the presence of other metals

Authors
Journal
Process Biochemistry
1359-5113
Publisher
Elsevier
Publication Date
Volume
38
Issue
1
Identifiers
DOI: 10.1016/s0032-9592(02)00065-1
Keywords
  • Candida Utilis
  • Dehydrated Yeast
  • Heavy Metals
  • Dual Metal System
  • Alcian Blue

Abstract

Abstract This study examined the Cr(VI), Cu(II), Zn(II), Cd(II), Pb(II) sorption by intact and dehydrated Candida utilis cells. The anion [Cr 2O 7] 2− and cation Me 2+ sorption kinetics was investigated in both single- and dual-metal situations. Uptake of chromate anions occurred much more slowly singularly than with metal cations. A combination of Pb or Cu and chromate anions gave a synergistic effect for Cr(VI) sorption, but not Cd and Zn, which inhibited Cr(VI) sorption by dehydrated cells. The use of alcian blue to occupy maximum vacant adsorption sites on the cell surface unexpectedly did not influence further adsorption of Me 2+. Metal uptake by C. utilis was 7 mg (135 μM) Cr, 23 mg (362 μM) Cu, 39 mg (188 μM) Pb, 19 mg (170 μM) Cd, 28 mg (428 μM) Zn gdw −1. Estimations of the number and area of metal ions occupying the cell surface was made and data obtained indicated that area of sorbed Cr(VI), Cd(II), Cu(II), Pb(II) occupied the single cell did not cover all the surface, whereas Zn(II) covered up to 168%.

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