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Bioavailability of iron(III) oxides ...

Rutgers The State University of New Jersey - New Brunswick.

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Bioavailability of iron(III) oxides and the impact of microbial iron reduction on mobility of radionuclides.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Bioavailability of iron(III) oxides and the impact of microbial iron reduction on mobility of radionuclides./
作者:	Hacherl, Eric Lawrence.
面頁冊數:	290 p.
附註:	Director: David S. Kosson.
Contained By:	Dissertation Abstracts International63-05B.
標題:	Biogeochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3055054
ISBN:	0493702571

Bioavailability of iron(III) oxides and the impact of microbial iron reduction on mobility of radionuclides.
Hacherl, Eric Lawrence.

Bioavailability of iron(III) oxides and the impact of microbial iron reduction on mobility of radionuclides. - 290 p.

Director: David S. Kosson.

Thesis (Ph.D.)--Rutgers The State University of New Jersey - New Brunswick, 2002.

Microbial Fe(III) reduction can play a major role in the biogeochemistry of anaerobic soil systems. Because Fe(III) oxides can readily sorb inorganic compounds, Fe(III) reduction may play a secondary role in contaminant mobility. As Fe(III) oxides are reduced to Fe(II) they become more soluble and might possibly release associated contaminants. In this work a mathematical model of microbial Fe(III) reduction was developed and the role that Fe(III) reduction has on mobility of radionuclides was investigated.

ISBN: 0493702571Subjects--Topical Terms:

545717
Biogeochemistry.

Bioavailability of iron(III) oxides and the impact of microbial iron reduction on mobility of radionuclides.
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245 1 0 $a Bioavailability of iron(III) oxides and the impact of microbial iron reduction on mobility of radionuclides.
300 $a 290 p.
500 $a Director: David S. Kosson.
500 $a Source: Dissertation Abstracts International, Volume: 63-05, Section: B, page: 2482.
502 $a Thesis (Ph.D.)--Rutgers The State University of New Jersey - New Brunswick, 2002.
520 $a Microbial Fe(III) reduction can play a major role in the biogeochemistry of anaerobic soil systems. Because Fe(III) oxides can readily sorb inorganic compounds, Fe(III) reduction may play a secondary role in contaminant mobility. As Fe(III) oxides are reduced to Fe(II) they become more soluble and might possibly release associated contaminants. In this work a mathematical model of microbial Fe(III) reduction was developed and the role that Fe(III) reduction has on mobility of radionuclides was investigated.
520 $a Soil Fe(III) bioavailability, defined as the fraction of Fe(III) in soils that can ultimately be reduced through microbial processes, is difficult to quantify experimentally. Previous to this work, bioavailability was estimated through acid extraction techniques, an approach that can only provide an operationally defined estimation. An assay that allows for mechanistic determination of Fe(III) oxides by titrating the sample with a reduced electron acceptor was developed and tested. The titration can be performed at normal soil pH. The technique may have some thermodynamic limitations, but for many soils it provided a good estimate of the total bioavailable Fe(III).
520 $a Information regarding Fe(III) bioavailability was used to develop a model of microbial Fe(III) reduction. The model combines biogeochemical reaction kinetics with a two-domain transport model. The two-domain model allows for certain regions of the soil to be isolated from bacterial contact, limiting total bioavailable Fe(III). The model was compared to experimental results, both of which indicated that siderite precipitation plays a dominant role in total Fe(III) reduction and in the distribution of Fe(II) produced. Sorption of Fe(II) to Fe(III) oxides was less important and sorption of Fe(II) to biomass was not detected.
520 $a Our ability to investigate radionuclide mobility was limited by the quantity and nature of the contaminated soils possessed by our group. The elution of <super> 137</super>Cs was not affected by any secondary effect of microbial Fe(III) reduction. However, an effect was observed for <super>241</super>Am. Much more <super>241</super>Am was eluted from Fe(III) reducing columns than from control columns. This may be the result of a secondary effect, such as precipitation of americium carbonate complexes.
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650 4 $a Biology, Microbiology. $3 1017734
650 4 $a Engineering, Chemical. $3 1018531
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710 2 0 $a Rutgers The State University of New Jersey - New Brunswick. $3 1017590
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