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Titolo:
MICROSCOPIC OBSERVATION OF A NAPL IN A 3-FLUID-PHASE SOIL SYSTEM
Autore:
HAYDEN NJ; VOICE TC;
Indirizzi:
UNIV VERMONT,DEPT CIVIL ENGN BURLINGTON VT 05405 MICHIGAN STATE UNIV,DEPT CIVIL & ENVIRONM ENGN E LANSING MI 48824
Titolo Testata:
Journal of contaminant hydrology
fascicolo: 3, volume: 12, anno: 1993,
pagine: 217 - 226
SICI:
0169-7722(1993)12:3<217:MOOANI>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
COMPUTED-TOMOGRAPHY; BULK-DENSITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
14
Recensione:
Indirizzi per estratti:
Citazione:
N.J. Hayden e T.C. Voice, "MICROSCOPIC OBSERVATION OF A NAPL IN A 3-FLUID-PHASE SOIL SYSTEM", Journal of contaminant hydrology, 12(3), 1993, pp. 217-226

Abstract

The focus of this study was to observe the location and form of a NAPL in a three-fluid-phase (air-NAPL-water) soil system utilizing an advanced microscopic technique, cryo-scanning electron microscopy (cryo-SEM) with X-ray analysis. A sandy aquifer material was brought to residual water (NaCl saturated) saturation (approximately 4% by pore volume) followed by NAPL (iodobenzene) saturation, ranging from approximately 1% to 80%, using modified Tempe(R) pressure cells. A small intact soil core was obtained from the pressure cell and quickly frozen in liquid nitrogen. The core was fractured and chromium coated at a high vacuum and - 130-degrees-C. Secondary electron images (SEI) and X-ray dot maps (Si, Cl and I) were made of samples with different NAPL saturations. Photomicrographs and X-ray dot maps confirmed the existence of continuous NAPL films on soil (containing a residual water saturation) athigh NAPL saturations. Photomicrographs revealed v-shaped wedges, pendular rings and films on irregular shaped sand grains. At low NAPL saturations (approximately 1% by pore volume), iodine was virtually nondetectable in the overall X-ray analysis of the sample. This suggests that the small quantity of NAPL present in the sample probably existed as thin films or small isolated lenses or blobs.

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Documento generato il 03/04/20 alle ore 20:08:55