6533b85bfe1ef96bd12ba860

RESEARCH PRODUCT

Cr(VI) sorption by intact and dehydrated Candida utilis cells in the presence of other metals

Larisa GrigorjevaAlexander RapoportIveta LubinyaElga VentinyaDonats MillersOlga Muter

subject

Chromate conversion coatingChemistryMetal ions in aqueous solutionInorganic chemistrySorption kineticsBioengineeringHeavy metalsSorptionApplied Microbiology and BiotechnologyBiochemistryIonMetalAdsorptionvisual_artvisual_art.visual_art_medium

description

This study examined the Cr(VI), Cu(II), Zn(II), Cd(II), Pb(II) sorption by intact and dehydrated Candida utilis cells. The anion [Cr2O7]2− and cation Me2+ 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 Me2+. 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%.

yearjournalcountryeditionlanguage
2002-09-01Process Biochemistry
https://doi.org/10.1016/s0032-9592(02)00065-1