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Titolo:
Assessment of bioavailability using a multicolumn system
Autore:
Zhao, XD; Voice, TC;
Indirizzi:
Michigan State Univ, Dept Civil & Environm Engn, E Lansing, MI 48824 USA Michigan State Univ E Lansing MI USA 48824 Engn, E Lansing, MI 48824 USA
Titolo Testata:
ENVIRONMENTAL SCIENCE & TECHNOLOGY
fascicolo: 8, volume: 34, anno: 2000,
pagine: 1506 - 1512
SICI:
0013-936X(20000415)34:8<1506:AOBUAM>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
AROMATIC-HYDROCARBONS; SORPTION; SOILS; TRANSPORT; BIODEGRADATION; NAPHTHALENE; CLAY; PHENANTHRENE; DEGRADATION; SEDIMENTS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Engineering, Computing & Technology
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Voice, TC Michigan State Univ, Dept Civil & Environm Engn, E Lansing, MI 48824 USA Michigan State Univ E Lansing MI USA 48824 ansing, MI 48824 USA
Citazione:
X.D. Zhao e T.C. Voice, "Assessment of bioavailability using a multicolumn system", ENV SCI TEC, 34(8), 2000, pp. 1506-1512

Abstract

The bioavailability of sorbed naphthalene was studied with a surface soil using a multiple soil column system. This approach allowed monitoring contaminant concentrations in both the liquid and soil phases. Biodegradation and desorption parameters were determined in independent column experiments. A model in which desorption and biodegradation occur as sequential and independent processes successfully described the concentration of naphthalene in bath phases. This result indicates that this organism only utilized liquid-phase contaminant, and direct soil-phase degradation did not occur. A previous study using the same organism concluded that direct soil-phase degradation occurred on four different soils in completely mixed batch systems. The discrepancy between these reports appears to be caused by the different conditions existing in batch and column systems and the use of mineralization data to infer desorption rates in the earlier study. We conclude that ifsubstrate depletion and mineralization rates are different, then desorption must be described using substrate concentration data from both the liquidand solid phases.

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Documento generato il 27/01/20 alle ore 01:59:32