Determination of the cd-bearing phases in municipal solid waste and Biomass single fly ash particles using SR-mu XRF Spectroscopy
Artikel i vetenskaplig tidskrift, 2007

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.

HEAVY-METALS

SPECIATION

MICRO-BEAM SPECTROMETRY

INDIVIDUAL PARTICLES

ELEMENTS

COMBUSTION

INCINERATION

BEHAVIOR

TOXIC METAL EMISSIONS

X-RAY FLUORESCENCE

Författare

Maria Caterina Camerani

Chemical Analysis

Chalmers University of Technology

Andrea Somogyi

SOLEIL Synchrotron

Bart Vekemans

Universiteit Antwerpen

Stuart Ansell

Rutherford Appleton Laboratory

Alexandre S. Simionovici

Ecole Normale Superieure de Lyon

Britt-Marie Steenari

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Itai Panas

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Analytical Chemistry

0003-2700 (ISSN) 1520-6882 (eISSN)

Vol. 79 6496-6506

Ämneskategorier

Analytisk kemi

Teoretisk kemi

Miljövetenskap

DOI

10.1021/ac070206j