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Characterization of Aquatic Organic Carbon Flux and Observation and Simulation of Natural Organic Matter Interaction with Fe.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Characterization of Aquatic Organic Carbon Flux and Observation and Simulation of Natural Organic Matter Interaction with Fe./
作者:	Li, Wei.
面頁冊數:	1 online resource (207 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-05, Section: B.
Contained By:	Dissertations Abstracts International84-05B.
標題:	Surface water. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30159480click for full text (PQDT)
ISBN:	9798352990186

Characterization of Aquatic Organic Carbon Flux and Observation and Simulation of Natural Organic Matter Interaction with Fe.
Li, Wei.

Characterization of Aquatic Organic Carbon Flux and Observation and Simulation of Natural Organic Matter Interaction with Fe. - 1 online resource (207 pages)

Source: Dissertations Abstracts International, Volume: 84-05, Section: B.

Thesis (Ph.D.)--The University of Manchester (United Kingdom), 2022.

Includes bibliographical references

The distribution of contaminants and nutrients in most natural waters is largely controlled by sorption and consequently the ratio of volume to surface area is a critical control on them. The main components of surface area are typically clay minerals, insoluble metal oxides (e.g. Fe, the most near to ubiquity) and natural organic matter (NOM). Therefore, this study aimed to investigate the distribution and character of NOM and Fe based on study site Crowden Great Brook to predicting contaminant and nutrient fluxes within and from the aquatic environment.This study quantified the OC flux, as the dominant component of NOM flux and significant contributor to global climate change, and characterized its comprising at high size resolution (1-0.2µm, 0.2µm-1.42nm, and <1.42nm) from eroded (E) and uneroded (U) sites of upland peat catchment Crowden Great Brook. The results showed E site contributed much more OC, dramatically dominated by the smallest size OC, into catchment than U site. Additionally, with the increase of discharge (Q) the OC flux in each size fraction is increase but with a very different particle size distribution in two sites. The smallest size OC flux was significantly dominated in E site but none of the size fraction OC flux is shown obvious dominance at U site with the increasing Q. These highlighted the importance of the E type areas from upland peat catchments to be a significant contributor to climate change and under the impact of climate change - more extreme weather happened to cause high Q event - both sites could contribute a lot of OC flux, which exacerbates the vicious circle of climate change. Characterization of OC at both sites shown that under base flow condition more abundance of aromatic carbon was in U site whereas soil lipids and polysaccharides was dominated in E site however the discharge event could lead to a very different compound proportions at both sites. The lability test highlighted the general believing that the smaller size of OC the more lability of it.In order to investigate the role of NOM in controlling the fate of Fe in natural waters, a methodology that can allow all Fe speciation be determined without destroying the object of quantification was developed in this study. Conventional Ferrozine assay was improved by using time instead of acidifying samples to determine free and total FeII (free + bound) concentration when the absorbance at 562 nm is measured both immediately (2s) and at the eventual maximum during which the samples must be maintained in sealed containers to prevent evaporation; the difference being the bound FeII concentration. The conventional total Fe analysis by acidifying samples prior to ICP-AES caused erroneously low Fe concentration measurement (only 62% - 79% of total Fe) as part of Fe is entrained by the coagulated NOM. The error increases with TOC concentration but is also a function of the type of NOM. An effective remedy is to pre-treat the samples with a combination of H2O2 and UV light to remove NOM. Therefore, bound FeIII could be deduced by subtraction if the production of FeIII(hydr)oxide can be assumed to all be Fe(OH)3.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798352990186Subjects--Topical Terms:

3685235
Surface water.
Index Terms--Genre/Form:

542853
Electronic books.

Characterization of Aquatic Organic Carbon Flux and Observation and Simulation of Natural Organic Matter Interaction with Fe.
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245 1 0 $a Characterization of Aquatic Organic Carbon Flux and Observation and Simulation of Natural Organic Matter Interaction with Fe.
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500 $a Advisor: Boult, Stephen.
502 $a Thesis (Ph.D.)--The University of Manchester (United Kingdom), 2022.
504 $a Includes bibliographical references
520 $a The distribution of contaminants and nutrients in most natural waters is largely controlled by sorption and consequently the ratio of volume to surface area is a critical control on them. The main components of surface area are typically clay minerals, insoluble metal oxides (e.g. Fe, the most near to ubiquity) and natural organic matter (NOM). Therefore, this study aimed to investigate the distribution and character of NOM and Fe based on study site Crowden Great Brook to predicting contaminant and nutrient fluxes within and from the aquatic environment.This study quantified the OC flux, as the dominant component of NOM flux and significant contributor to global climate change, and characterized its comprising at high size resolution (1-0.2µm, 0.2µm-1.42nm, and <1.42nm) from eroded (E) and uneroded (U) sites of upland peat catchment Crowden Great Brook. The results showed E site contributed much more OC, dramatically dominated by the smallest size OC, into catchment than U site. Additionally, with the increase of discharge (Q) the OC flux in each size fraction is increase but with a very different particle size distribution in two sites. The smallest size OC flux was significantly dominated in E site but none of the size fraction OC flux is shown obvious dominance at U site with the increasing Q. These highlighted the importance of the E type areas from upland peat catchments to be a significant contributor to climate change and under the impact of climate change - more extreme weather happened to cause high Q event - both sites could contribute a lot of OC flux, which exacerbates the vicious circle of climate change. Characterization of OC at both sites shown that under base flow condition more abundance of aromatic carbon was in U site whereas soil lipids and polysaccharides was dominated in E site however the discharge event could lead to a very different compound proportions at both sites. The lability test highlighted the general believing that the smaller size of OC the more lability of it.In order to investigate the role of NOM in controlling the fate of Fe in natural waters, a methodology that can allow all Fe speciation be determined without destroying the object of quantification was developed in this study. Conventional Ferrozine assay was improved by using time instead of acidifying samples to determine free and total FeII (free + bound) concentration when the absorbance at 562 nm is measured both immediately (2s) and at the eventual maximum during which the samples must be maintained in sealed containers to prevent evaporation; the difference being the bound FeII concentration. The conventional total Fe analysis by acidifying samples prior to ICP-AES caused erroneously low Fe concentration measurement (only 62% - 79% of total Fe) as part of Fe is entrained by the coagulated NOM. The error increases with TOC concentration but is also a function of the type of NOM. An effective remedy is to pre-treat the samples with a combination of H2O2 and UV light to remove NOM. Therefore, bound FeIII could be deduced by subtraction if the production of FeIII(hydr)oxide can be assumed to all be Fe(OH)3.
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