title: Structural study of the incorporation of heavy metals into solid phase formed during the oxidation of EDTA by permanganate at high pH.
abstract: Properties of solid phases formed during the oxidation of EDTA by permanganate in a high-pH, high-ionic strength solution, and the retention of Cu2+, Ni2+, and Zn2+ by them were examined. Morphologically, the solids were agglomerates of particles with sizes <100 nm. X-ray absorption spectroscopy (XAS) analysis indicated that these particles were birnessite. Its precipitation was accompanied by the removal of Zn2+ and Cu2+ released as a result of the breakdown of their complexes with EDTA. However, Ni2+ was not removed from the supernatant. Cu2+ was strongly bound by birnessite and exhibited little mobility in the pH range from 3 to 14. Zn2+ was more mobile, especially at pH > 12. XAS showed that Cu2+ binding sites were located within MnO6 octahedra-comprised sheets that constitute birnessite while Zn2+ was positioned between them.
authors: Department of Civil and Environmental Engineering, Box 352700, University of Washington, Seattle, Washington 98115-2700, USA. Korshin@u.washington.edu
authors: Gregory V
authors: GV
authors: Korshin
authors: Hyun-Shik
authors: HS
authors: Chang
authors: Anatoly I
authors: AI
authors: Frenkel
authors: John F
authors: JF
authors: Ferguson
mesh_terms: D004492:Edetic Acid / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D017895:Manganese Compounds / Q000737:chemistry*; D019216:Metals, Heavy / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D044367:Phase Transition; D013054:Spectrophotometry, Atomic; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D017895:Manganese Compounds; D019216:Metals, Heavy; D010087:Oxides; D014874:Water Pollutants, Chemical; C048856:permanganic acid; D004492:Edetic Acid