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Sorptive dynamics and fluorescence p...

Komada, Tomoko.

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Sorptive dynamics and fluorescence properties of organic carbon within coastal sedimentary environments.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Sorptive dynamics and fluorescence properties of organic carbon within coastal sedimentary environments./
作者:	Komada, Tomoko.
面頁冊數:	133 p.
附註:	Director: Clare E. Reimers.
Contained By:	Dissertation Abstracts International63-03B.
標題:	Biogeochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3046750
ISBN:	0493608206

Sorptive dynamics and fluorescence properties of organic carbon within coastal sedimentary environments.
Komada, Tomoko.

Sorptive dynamics and fluorescence properties of organic carbon within coastal sedimentary environments. - 133 p.

Director: Clare E. Reimers.

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

Sorptive behavior and fluorescence characteristics of organic carbon (OC) were examined in Hudson River Estuary and Inner New York Bight sediments, with the overall goal of understanding the nature and biogeochemical role of the fraction of particulate OC (POC) that readily exchanges with dissolved OC (DOC). In two studies, the significance of sorption and fundamental properties of the readily-exchangeable POC fraction were investigated under laboratory conditions simulating bottom resuspension. In the third study, the role of sorption in controlling pore-water DOC cycling was evaluated within the sediment column.

ISBN: 0493608206Subjects--Topical Terms:

545717
Biogeochemistry.

Sorptive dynamics and fluorescence properties of organic carbon within coastal sedimentary environments.
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100 1 $a Komada, Tomoko. $3 1251719
245 1 0 $a Sorptive dynamics and fluorescence properties of organic carbon within coastal sedimentary environments.
300 $a 133 p.
500 $a Director: Clare E. Reimers.
500 $a Source: Dissertation Abstracts International, Volume: 63-03, Section: B, page: 1207.
502 $a Thesis (Ph.D.)--Rutgers The State University of New Jersey - New Brunswick, 2002.
520 $a Sorptive behavior and fluorescence characteristics of organic carbon (OC) were examined in Hudson River Estuary and Inner New York Bight sediments, with the overall goal of understanding the nature and biogeochemical role of the fraction of particulate OC (POC) that readily exchanges with dissolved OC (DOC). In two studies, the significance of sorption and fundamental properties of the readily-exchangeable POC fraction were investigated under laboratory conditions simulating bottom resuspension. In the third study, the role of sorption in controlling pore-water DOC cycling was evaluated within the sediment column.
520 $a In order to simulate resuspension, surface sediments were dispersed in bottom water from the same locations for 30 seconds to 2 hours. After resuspension, DOC concentration generally exceeded the value predicted by conservative mixing of pore and bottom waters, indicating net release of OC from POC. Regression analyses between the amount of OC released and the POC content of sediment density fractionates suggest that ≤0.3% of the mineral-bound POC pool may be readily releasable into solution across the estuarine gradient.
520 $a In the second study, chemical characteristics of the OC released into solution during the resuspension experiments were explored through excitation-emission matrix (EEM) fluorescence spectroscopy. Examination of EEMs revealed that relative to values predicted by conservative mixing, resuspension resulted in: (1) more intense humic-like fluorescence; and (2) proportionally greater fluorescence in the longer wavelength region of the electromagnetic spectrum. Trends in the literature data strongly suggest fluorophores that emit at longer wavelengths to be increasingly degraded. The data therefore imply that resuspension results in net release of degraded, mineral-bound organic matter from the sediment matrix into solution.
520 $a In order to evaluate the significance of sorptive processes within the sediment column, a diagenetic model was applied to DOC profiles determined within the study area. OC was assumed to undergo linear equilibrium adsorption, with a coefficient that was estimated from the results of the first study. Model calculations show that sorption is unlikely to be a major factor controlling pore-water DOC accumulation patterns. Rather, redox-dependent microbial processes and sediment mixing most often dominate DOC cycling within the benthos.
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791 $a Ph.D.
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