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Determination of the cd-bearing phases in municipal solid waste and Biomass single fly ash particles using SR-mu XRF Spectroscopy

Maria Caterina Camerani ; Andrea Somogyi ; Bart Vekemans ; Stuart Ansell ; Alexandre S. Simionovici ; Britt-Marie Steenari (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Itai Panas (Institutionen för kemi- och bioteknik, Oorganisk miljökemi)
ANALYTICAL CHEMISTRY (0003-2700). Vol. 79 (2007), 17, p. 6496-6506 .
[Artikel, refereegranskad vetenskaplig]

By using an excitation energy of 27.0 keV, synchrotron radiation-induced micro-X-ray fluorescence (SR-mu XRF) is employed to extract information regarding the composition and distribution of Cd-bearing phases in municipal solid waste (MSW) and biomass fly ashes. Significance of observation is based on statistics of totally more than 100 individual MSW and biomass fly ash particles from a fluidized bed combustion (FBC) plant. Cd concentrations in the parts-per-million range are determined. In general, although previous leaching studies have indicated Cd to be predominant in the smaller-size ash particles, in the present study Cd is more evenly distributed throughout all the particle sizes. For MSW fly ashes, results indicate the presence of Cd mainly as CdBr2 hot-spots, whereas for biomass fly ashes, which exhibit lower CdX2 concentration, a thin Cd layer on/in the particles is reported. For both ashes, Ca-containing matrixes are found to be the main Cd-bearing phases. Support for this observation is found from independent first-principles periodic density functional theory calculations. The observations are condensed into a schematic mechanism for Cd adsorption on the fly ash particles.

Nyckelord: X-RAY FLUORESCENCE; MICRO-BEAM SPECTROMETRY; TOXIC METAL EMISSIONS; HEAVY-METALS; INDIVIDUAL PARTICLES; SPECIATION; COMBUSTION; BEHAVIOR; INCINERATION; ELEMENTS



Denna post skapades 2007-10-22. Senast ändrad 2015-03-30.
CPL Pubid: 55850

 

Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Oorganisk miljökemi (2005-2014)

Ämnesområden

Spektroskopi
Kvantkemi
Tungmetaller och övriga metaller

Chalmers infrastruktur