Methods of determining lead speciation in fly ash by X-ray absorption fine-structure spectroscopy and a sequential extraction procedure.
TLDR
Three potential methods for obtaining quantitative information regarding the chemical state of lead in fly ash are identified and it is concluded that multiple analyses should be compared multilaterally to improve the accuracy of the final analysis.Abstract:
Understanding the chemical state of lead in fly ash generated from a waste thermal treatment is important, since the toxicity and solubility of the element depends on its chemical state. This study identified three potential methods for obtaining quantitative information regarding the chemical state of lead in fly ash: X-ray absorption near edge structure (XANES) analysis, extended X-ray absorption fine structure (EXAFS) analysis, and the sequential extraction procedure. The result of this procedure was strongly affected by the pH and sample matrix, and did not necessarily accurately reflect the chemical state. It was difficult to quantitatively examine the chemical species using only EXAFS. However, an XANES fitting enabled direct quantification of the chemical species. An XANES analysis showed that PbSiO(3), PbCl(2), or Pb(2)O(OH)(2) was the predominant chemical species in fly ash. We concluded that multiple analyses should be compared multilaterally to improve the accuracy of the final analysis.read more
Citations
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Interplay of metals and bromine with dioxin-related compounds concentrated in e-waste open burning soil from Agbogbloshie in Accra, Ghana
Takashi Fujimori,Takaaki Itai,Akitoshi Goto,Kwadwo Ansong Asante,Masanari Otsuka,Shin Takahashi,Shinsuke Tanabe +6 more
TL;DR: Investigation of the interplay of metals and bromine in the formation of dioxin-related compounds finds Cu, Pb, Zn, Fe, Co, and Sr contained in various e-wastes, wires/cables, plastics, and tires strongly influenced generation of many DRCs.
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Chemical association and mobility of trace elements in 13 different fuel incineration fly ashes
Naeem Saqib,Mattias Bäckström +1 more
TL;DR: In this article, the authors investigated the chemical association and potential mobility of trace elements from waste incineration fly ash during utilization/landfilling and investigated the potential migration of trace elem...
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Heavy metal mobility and valuable contents of processed municipal solid waste incineration residues from Southwestern Germany.
Sergey M. Abramov,Sergey M. Abramov,Jing He,Jing He,Dominik Wimmer,Marie-Louise Lemloh,E. Marie Muehe,E. Marie Muehe,Benjamin Gann,Ellen Roehm,Rainer Kirchhof,Michael G. Babechuk,Michael G. Babechuk,Ronny Schoenberg,Harald Thorwarth,Thomas Helle,Andreas Kappler +16 more
TL;DR: The most important finding of the study is that the total contents of Cu, Au and Pt in the incineration residues reached economically profitable levels and the level of valuable critical contents in these wastes was investigated.
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Leaching for recovery of copper from municipal solid waste incineration fly ash: influence of ash properties and metal speciation.
TL;DR: The work described in this article was focused on elucidating physical and chemical differences between two ash samples with the aim of explaining the differences in copper release from these samples in two leaching methods and showed that the chemical speciation is an important factor affecting the release of copper.
Journal ArticleDOI
Particle- and colloid-facilitated Pb transport in four historically contaminated soils - Speciation and effect of irrigation intensity
Åsa Löv,Geert Cornelis,Mats Larsbo,Ingmar Persson,Carin Sjöstedt,Jon Petter Gustafsson,Kristin Boye,Dan Berggren Kleja +7 more
TL;DR: In this paper, the role of colloidal and particulate transport varies considerably between soils and the mechanisms controlling mobilisation are complex and poorly known, however, increased frequency of high-intensity rainfall events is expected in some parts of Europe and North America in response to climate change, which might increase the mobilisation of particles and colloids.
References
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Sequential extraction procedure for the speciation of particulate trace metals
TL;DR: In this paper, an analytical procedure involving sequential chemicai extractions was developed for the partitioning of particulate trace metals (Cd, Co, Cu, Ni, Pb, Zn, Fe, and Mn) into five fractions: exchangeable, bound to carbonates, binding to Fe-Mn oxides and bound to organic matter.
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TL;DR: A comprehensive approach was used to characterize speciation and leaching behavior of major, minor, and trace elements in electrostatic precipitator (ESP) ash from a Canadian MSW incinerator.
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Combining selective sequential extractions, X-ray absorption spectroscopy, and principal component analysis for quantitative zinc speciation in soil.
TL;DR: A combined approach, in which XAFS spectra were collected after each of 6 SSE steps, and then analyzed by multishell fitting, principal component analysis (PCA) and linear combination fits (LCF), to determine the Zn speciation in a smelter-contaminated, strongly acidic soil, identified and quantify both mobile and recalcitrant species with high reliability and precision.
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Heavy metal stabilization in municipal solid waste combustion bottom ash using soluble phosphate
Bradley S. Crannell,T. Taylor Eighmy,James E. Krzanowski,J. Dykstra Eusden,Elisabeth L. Shaw,Carl A. Francis +5 more
TL;DR: In this article, an experimental dose of 0.38 mols of soluble PO 4 3− per kg of residue was used without optimizing the formulation for any one heavy metal, and the reduction in the fraction available for leaching according to the total availability leaching test was 52% for Ca, 14% for Cd, 98% for Cu, 99% for Pb, and 36% for Zn.
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Application of computer modelling to predict the leaching behaviour of heavy metals from MSWI fly ash and comparison with a sequential extraction method
TL;DR: In this paper, the results of experimental leaching tests of fly ash are compared with computer calculations of the thermodynamic equilibrium of the leaching solution of the fly ash system and a sequential extraction procedure was performed on the fly ashes.