"Isotope fractionation and spectroscopic analysis as an evidence of Cr(VI) reduction during biosorption" . . "3"^^ . . "RIV/60460709:41330/14:61117!RIV15-TA0-41330___" . . "Isotope fractionation and spectroscopic analysis as an evidence of Cr(VI) reduction during biosorption"@en . . . "\u010Cadkov\u00E1, Eva" . . . . "This work investigates the mechanisms behind Cr(VI) biosorption/reduction on three biomaterials (brewers draff, grape waste and synthetic humic acid). Coupled Cr isotope analysis with ICP-OES, XPS and SEM was tested as a novel approach to study the reduction of Cr(VI) by the biomaterials. The Cr(VI) biosorption process was accompanied with heavier Cr isotopes enrichment in the remaining Cr(VI) fraction. A significant fractionation of Cr stable isotopes was observed with no significant pH effect; ?53Cr of the remaining fraction ranged from 0,2 to 1,9 while ?53Cr of the product (sorbed Cr) ranged from -1,2 to -2,8. The Rayleigh fractionation model fitted well the measured data and Cr isotope analysis provides thus an efficient tool to quantify Cr(VI) reduction by different biomaterials. In general, the sorption/reduction potential of the three studied biomaterials decreased in the following order: grape waste > humic acids > brewers draff."@en . . . . "Isotope fractionation and spectroscopic analysis as an evidence of Cr(VI) reduction during biosorption" . "GB - Spojen\u00E9 kr\u00E1lovstv\u00ED Velk\u00E9 Brit\u00E1nie a Severn\u00EDho Irska" . "P(TA01021055), S" . "This work investigates the mechanisms behind Cr(VI) biosorption/reduction on three biomaterials (brewers draff, grape waste and synthetic humic acid). Coupled Cr isotope analysis with ICP-OES, XPS and SEM was tested as a novel approach to study the reduction of Cr(VI) by the biomaterials. The Cr(VI) biosorption process was accompanied with heavier Cr isotopes enrichment in the remaining Cr(VI) fraction. A significant fractionation of Cr stable isotopes was observed with no significant pH effect; ?53Cr of the remaining fraction ranged from 0,2 to 1,9 while ?53Cr of the product (sorbed Cr) ranged from -1,2 to -2,8. The Rayleigh fractionation model fitted well the measured data and Cr isotope analysis provides thus an efficient tool to quantify Cr(VI) reduction by different biomaterials. In general, the sorption/reduction potential of the three studied biomaterials decreased in the following order: grape waste > humic acids > brewers draff." . . . . . "Isotope fractionation and spectroscopic analysis as an evidence of Cr(VI) reduction during biosorption"@en . "6"^^ . "95" . . "Chemosphere" . "Chrastn\u00FD, Vladislav" . . "RIV/60460709:41330/14:61117" . "000328868400056" . "0045-6535" . "2014" . "Kom\u00E1rek, Michael" . . . "biosorption, chromium(VI), isotope fractionation, rayleigh fractionation model, reduction"@en . "41330" . "[36F41F74D1BC]" . "\u0160illerov\u00E1, Hana" . . "4"^^ . "22972" .