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X-ray fluorescence tomography of individual municipal solid waste and biomass fly ash particles

Camerani, Maria Caterina and Golosio, Bruno and Somogyi, Andrea and Simionovici, Alexandre and Steenari, Britt-Marie and Panas, Itai (2004) X-ray fluorescence tomography of individual municipal solid waste and biomass fly ash particles. Analytical Chemistry, Vol. 76 (6), p. 1586-1595. eISSN 1520-6882. Article.

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DOI: 10.1021/ac030282w

Abstract

Information about Cd distribution inside single municipal solid waste and biomass fly ash particles is fundamental since it affects its leachability. The internal 2D distributions of the main and trace elements in such highly inhomogeneous matrixes were successfully determined by means of the combined synchrotron radiation induced micro X-ray fluorescence (µ-SRXRF) and tomography (µ -SRXRFT) techniques. Scanning µ-SRXRF measurements show Cd elemental distribution within single fly ash particles to be inhomogeneous, but no information can be obtained about its internal distribution. During µ-SRXRFT analysis, single fly ash particles are successively measured by a rotational−translational scan in a VH = 2 × 5 µm2 microbeam. The 2D internal elemental distribution images, obtained by the modified simultaneous algebraic reconstruction technique algorithm, provide the size and the location of Cd-containing areas together with the location of other measurable elements. Results showed Cd concentration to be higher in the core of the fly ash particles analyzed rather than on the surface of the particles. Moreover, in both ashes, Ca-containing matrixes are found to be the main Cd-bearing phases. A possible mechanism for Cd adsorption on the fly ash particles is proposed based on the obtained results.

Item Type:Article
ID Code:1968
Status:Published
Refereed:Yes
Uncontrolled Keywords:Trace-elements, incineration, scanning μ-SRXRFT
Subjects:Area 02 - Scienze fisiche > FIS/07 Fisica applicata (a beni culturali, ambientali, biologia e medicina)
Divisions:001 Università di Sassari > 03 Istituti > Matematica e fisica
Publisher:American Chemical Society
eISSN:1520-6882
Deposited On:18 Aug 2009 10:06

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