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Title: XAFS Studies of Nickel And Sulfur Speciation in Residual Oil Fly-Ash Particulate Matters (ROFA PM)

Abstract

XAFS spectroscopy has been employed to evaluate the effect of fuel compositions and combustion conditions on the amount, form, and distribution of sulfur and nickel in size-fractionated ROFA PM. Analysis of S K-edge XANES establish that sulfate is abundant in all PM. However, depending upon the combustion conditions, lesser amounts of thiophenic sulfur, metal sulfide, and elemental sulfur may also be observed. Least-squares fitting of Ni K-edge XANES reveals that most of the nickel in PM is present as bioavailable NiSO{sub 4}.nH{sub 2}O. The insoluble Ni mainly exists as a minor species, as nickel ferrite in PM{sub 2.5} (PM < 2.5 {micro}m) and nickel sulfide, NixSy in PM{sub 2.5+} (PM > 2.5 {micro}m). The Ni K-edge XANES results are in agreement with the EXAFS data. Such detailed speciation of Ni and S in PM is needed for determining their mobility, bioavailability, and reactivity, and hence, their role in PM toxicity. This information is also important for understanding the mechanism of PM formation, developing effective remediation measures, and providing criteria for identification of potential emission sources. Transition metals complexing with sulfur is ubiquitous in nature. Therefore, this information on metal sulfur complex can be critical to a large body of environmentalmore » literature.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
909752
Report Number(s):
SLAC-REPRINT-2007-138
Journal ID: ISSN 0013-936X; ESTHAG; TRN: US200723%%33
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Journal Article
Journal Name:
Environ. Sci. Tech. 41:1104,2007
Additional Journal Information:
Journal Volume: 41; Journal ID: ISSN 0013-936X
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; COMBUSTION PRODUCTS; FLY ASH; NICKEL COMPOUNDS; PARTICULATES; SULFUR COMPOUNDS; TOXICITY; CHEMICAL COMPOSITION; RESIDUAL FUELS; CHEMICAL STATE; Other,OTHER

Citation Formats

Pattanaik, S, Huggins, F E, Huffman, G P, Linak, W P, and Miller, C A. XAFS Studies of Nickel And Sulfur Speciation in Residual Oil Fly-Ash Particulate Matters (ROFA PM). United States: N. p., 2007. Web. doi:10.1021/es061635m.
Pattanaik, S, Huggins, F E, Huffman, G P, Linak, W P, & Miller, C A. XAFS Studies of Nickel And Sulfur Speciation in Residual Oil Fly-Ash Particulate Matters (ROFA PM). United States. doi:10.1021/es061635m.
Pattanaik, S, Huggins, F E, Huffman, G P, Linak, W P, and Miller, C A. Thu . "XAFS Studies of Nickel And Sulfur Speciation in Residual Oil Fly-Ash Particulate Matters (ROFA PM)". United States. doi:10.1021/es061635m.
@article{osti_909752,
title = {XAFS Studies of Nickel And Sulfur Speciation in Residual Oil Fly-Ash Particulate Matters (ROFA PM)},
author = {Pattanaik, S and Huggins, F E and Huffman, G P and Linak, W P and Miller, C A},
abstractNote = {XAFS spectroscopy has been employed to evaluate the effect of fuel compositions and combustion conditions on the amount, form, and distribution of sulfur and nickel in size-fractionated ROFA PM. Analysis of S K-edge XANES establish that sulfate is abundant in all PM. However, depending upon the combustion conditions, lesser amounts of thiophenic sulfur, metal sulfide, and elemental sulfur may also be observed. Least-squares fitting of Ni K-edge XANES reveals that most of the nickel in PM is present as bioavailable NiSO{sub 4}.nH{sub 2}O. The insoluble Ni mainly exists as a minor species, as nickel ferrite in PM{sub 2.5} (PM < 2.5 {micro}m) and nickel sulfide, NixSy in PM{sub 2.5+} (PM > 2.5 {micro}m). The Ni K-edge XANES results are in agreement with the EXAFS data. Such detailed speciation of Ni and S in PM is needed for determining their mobility, bioavailability, and reactivity, and hence, their role in PM toxicity. This information is also important for understanding the mechanism of PM formation, developing effective remediation measures, and providing criteria for identification of potential emission sources. Transition metals complexing with sulfur is ubiquitous in nature. Therefore, this information on metal sulfur complex can be critical to a large body of environmental literature.},
doi = {10.1021/es061635m},
journal = {Environ. Sci. Tech. 41:1104,2007},
issn = {0013-936X},
number = ,
volume = 41,
place = {United States},
year = {2007},
month = {7}
}