Speciation of elements in NIST particulate matter SRMs 1648 and 1650

被引:103
作者
Huggins, FE
Huffman, GP
Robertson, JD
机构
[1] Univ Kentucky, Dept Chem & Mat Engn, Lexington, KY 40506 USA
[2] Univ Kentucky, Dept Chem, Lexington, KY 40506 USA
关键词
particulate matter; element speciation; XAFS spectroscopy; standard reference materials; oxidation state;
D O I
10.1016/S0304-3894(99)00195-8
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
X-ray absorption fine structure (XAFS) spectra for S, Cl, V, Cr, Mn, Cu, Zn, As, Br, Cd and Pb and Mossbauer spectra for Fe have been obtained for two National Institute of Standards and Technology (NIST) particulate matter (PM) standard reference materials (SRMs): urban PM (SRM 1648) and diesel PM (SRM 1650). The spectral data, complemented by information on elemental concentrations from proton-induced X-ray-emission (PIXE) spectroscopy, were used to interpret the speciation of these elements in these complex materials. It appears that all the metallic elements investigated occur in oxidized forms, principally as sulfates in the diesel PM SRM and as sulfates, oxides, and possibly other forms (e.g. clays?) in the urban PM. A minor fraction of the sulfur and major fractions of the halogens, Cl and Pr, occur as organosulfide (thiophene) and organohalide occurrences, respectively, that must be associated with the abundant carbonaceous matter that constitutes the major component of the two PM SRMs. Most of the sulfur, however, occurs as sulfate in the urban PM and as bisulfate in the diesel PM. In addition, elemental oxidation states have been determined directly by the spectroscopic techniques. Such information is often the key parameter in determining the toxicity and solubility of specific elements in PM, both of which are important in understanding the threat that such elements may pose to human health. For the two HAP elements, Cr and As, for which the toxicity depends greatly on oxidation state, the XAFS data showed that both elements are present in both SRMs predominantly in the less toxic oxidation states, Cr(III) and As(V). The potential of the XAFS spectra for use as source apportionment signatures is illustrated by reference to chromium, which exists in these two PM SRMs in very different forms. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
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页码:1 / 23
页数:23
相关论文
共 28 条
[1]  
BENSON SA, 1998, P C AIR QUAL
[2]  
BROWN GE, 1988, REV MINERAL, V18, P431
[3]  
CHOW J, 1998, P SPEC C LONG BEACH, V1
[4]   A 13-ELEMENT GE DETECTOR FOR FLUORESCENCE EXAFS [J].
CRAMER, SP ;
TENCH, O ;
YOCUM, M ;
GEORGE, GN .
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1988, 266 (1-3) :586-591
[5]   COORDINATION GEOMETRY OF TRANSITION-METAL IONS IN DILUTE-SOLUTIONS BY XANES [J].
GARCIA, J ;
BIANCONI, A ;
BENFATTO, M ;
NATOLI, CR .
JOURNAL DE PHYSIQUE, 1986, 47 (C-8) :49-54
[6]   QUANTITATIVE-ANALYSIS OF ALL MAJOR FORMS OF SULFUR IN COAL BY X-RAY ABSORPTION FINE-STRUCTURE SPECTROSCOPY [J].
HUFFMAN, GP ;
MITRA, S ;
HUGGINS, FE ;
SHAH, N ;
VAIDYA, S ;
LU, FL .
ENERGY & FUELS, 1991, 5 (04) :574-581
[7]   SPECIATION OF ARSENIC AND CHROMIUM IN COAL AND COMBUSTION ASH BY XAFS SPECTROSCOPY [J].
HUFFMAN, GP ;
HUGGINS, FE ;
SHAH, N ;
ZHAO, JM .
FUEL PROCESSING TECHNOLOGY, 1994, 39 (1-3) :47-62
[8]   NONDESTRUCTIVE DETERMINATION OF TRACE-ELEMENT SPECIATION IN COAL AND COAL ASH BY XAFS SPECTROSCOPY [J].
HUGGINS, FE ;
SHAH, N ;
ZHAO, JM ;
LU, FL ;
HUFFMAN, GP .
ENERGY & FUELS, 1993, 7 (04) :482-489
[9]   CHLORINE IN COAL - AN XAFS SPECTROSCOPIC INVESTIGATION [J].
HUGGINS, FE ;
HUFFMAN, GP .
FUEL, 1995, 74 (04) :556-569
[10]   Direct speciation of chromium in coal combustion by-products by X-ray absorption fine-structure spectroscopy [J].
Huggins, FE ;
Najih, M ;
Huffman, GP .
FUEL, 1999, 78 (02) :233-242