title: Cr(VI) and Cr(III) speciation on Bacillus sphaericus loaded diaion SP-850 resin.
abstract: A speciation procedure for chromium(III) and chromium(VI) in the environmental samples has been established in the presented work. The procedure presented based on quantitative biosorption of chromium(III) on Bacillus sphaericus loaded Diaion SP-850 at pH 5. The Cr(VI) recoveries at pH 5 were below 5% on the biosorbent. After reduction of Cr(VI) by concentrated H(2)SO(4) and ethanol, the system was applied to the total chromium. Cr(VI) was calculated as the difference between the total chromium content and the Cr(III) content. Optimal analytical conditions including pH, amounts of biosorbent, etc. for Cr(III) recoveries were investigated. The influences of the some alkaline and earth alkaline ions and some transition metals on the recoveries were also investigated. The capacity of biosorbent for chromium(III) was 6.95 mgg(-1). The detection limit (3 sigma) of the reagent blank for chromium(III) was 0.50 microgL(-1). The procedure was successfully applied to the speciation of chromium(III) and chromium(VI) in natural water samples (R.S.D. lower than 5%, recoveries greater than 95%).
authors.affiliation: Gaziosmanpasa University, Faculty of Science and Arts, Chemistry Department, 60250 Tokat, Turkey.
authors.forename: Mustafa
authors.initials: M
authors.lastname: Tuzen
authors.forename: Ozgur Dogan
authors.initials: OD
authors.lastname: Uluozlu
authors.forename: Mustafa
authors.initials: M
authors.lastname: Soylak
mesh_terms: D000327:Adsorption; D001407:Bacillus / Q000737:chemistry*; D002857:Chromium / Q000032:analysis / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D011137:Polystyrenes / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
chemical_list: D011137:Polystyrenes; D014874:Water Pollutants, Chemical; D002857:Chromium; C074702:chromium hexavalent ion