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Titolo:
Zinc speciation in a contaminated aquatic environment: Characterization ofenvironmental particles by analytical electron microscopy
Autore:
Webb, SM; Leppard, GG; Gaillard, JF;
Indirizzi:
Northwestern Univ, Dept Civil Engn, Evanston, IL 60208 USA Northwestern Univ Evanston IL USA 60208 ivil Engn, Evanston, IL 60208 USA Environm Canada, Natl Water Res Inst, Burlington, ON L7R 4A6, Canada Environm Canada Burlington ON Canada L7R 4A6 rlington, ON L7R 4A6, Canada
Titolo Testata:
ENVIRONMENTAL SCIENCE & TECHNOLOGY
fascicolo: 10, volume: 34, anno: 2000,
pagine: 1926 - 1933
SICI:
0013-936X(20000515)34:10<1926:ZSIACA>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
AEM-TEM; EUTROPHIC LAKE; TRACE-METALS; ABERT LAKE; IRON; EXTRACTION; MANGANESE; SYSTEMS; SPECTROSCOPY; DIAGENESIS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Engineering, Computing & Technology
Citazioni:
57
Recensione:
Indirizzi per estratti:
Indirizzo: Gaillard, JF Northwestern Univ, Dept Civil Engn, Evanston, IL 60208 USA Northwestern Univ Evanston IL USA 60208 anston, IL 60208 USA
Citazione:
S.M. Webb et al., "Zinc speciation in a contaminated aquatic environment: Characterization ofenvironmental particles by analytical electron microscopy", ENV SCI TEC, 34(10), 2000, pp. 1926-1933

Abstract

Analytical electron microscopy (AEM) was used to characterize individual aquatic particles in a lake that has been contaminated by zinc smelting operations. Samples were collected from the sediments and the water column of the lake along a gradient of metal contamination. The samples were prepared to preserve their aqueous nature, and thin sections were observed by transmission electron microscopy (TEM). Zinc bearing particles were characterizedby different morphologies ranging from near spherical large colloids (i.e., a few 100 nm) to small grains either intimately associated with biological templates or present as separate amorphous entities. Elemental associations were determined for each individual particle by X-ray energy dispersive spectrometry (EDS). These analyses revealed the pervasive presence of Zn through the aquatic environment and its intimate combination with Fe and P inbiotic structures. The association of Zn and P was most prevalent close tothe source of contamination, whereas afar Zn was primarily found in sulfurmoieties. Cluster analyses, performed on four different sets of EDS measurements, exemplify the fate of Zn in the lake by quantifying changes in elemental associations.

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Documento generato il 05/12/20 alle ore 01:51:19