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Divergence of Iron and Manganese Oxidation State Distributions, Bonding Environments, and Mobility in Mining-Impacted Lake Sediments : = Column Experiments.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Divergence of Iron and Manganese Oxidation State Distributions, Bonding Environments, and Mobility in Mining-Impacted Lake Sediments :/
其他題名:	Column Experiments.
作者:	Swanson, Gaige.
面頁冊數:	1 online resource (34 pages)
附註:	Source: Masters Abstracts International, Volume: 84-03.
Contained By:	Masters Abstracts International84-03.
標題:	Water resources management. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29323012click for full text (PQDT)
ISBN:	9798351406985

Divergence of Iron and Manganese Oxidation State Distributions, Bonding Environments, and Mobility in Mining-Impacted Lake Sediments : = Column Experiments.
Swanson, Gaige.

Divergence of Iron and Manganese Oxidation State Distributions, Bonding Environments, and Mobility in Mining-Impacted Lake Sediments :Column Experiments. - 1 online resource (34 pages)

Source: Masters Abstracts International, Volume: 84-03.

Thesis (M.S.)--University of Idaho, 2022.

Includes bibliographical references

The mobility of a metal in mining-impacted sediments is determined by the environmental conditions that influence the metal's oxidation state and bonding environment. Coeur d'Alene Lake of northern Idaho, USA, has been impacted by legacy mining practices that allowed the hydrologic transport of mining waste to the lakebed, which resulted in the deposition of an estimated 75 Mt of metal(loid)-rich sediments containing As, Cd, Fe, Mn, Pb, and Zn over the past 100+ years. Future lake conditions may include substantial algal blooms and deposition of additional algal detritus to the sediment-water interface, which may alter metal remobilization/retention during seasonal anoxia. Cores of the lake sediments were exposed to anoxic and anoxic + algae conditions for eight weeks. Over the eight-week period and at a location 12.5 cm deep in the sediments, anoxic and anoxic + algae conditions produced relatively stable Fe and Mn oxidation states and bonding environments. At a location 2.5 cm below the sediment-water interface, anoxic conditions promoted a relatively stable environment in which Fe and Mn oxidation states did not vary greatly during the experiment. At the 2.5-cm depth, the anoxic + algae condition substantially altered the Mn oxidation state distribution and bonding environment, but this condition did not strongly influence the Fe oxidation state distribution or bonding environment. The addition of algal detritus increased the presence of Mn3+, at select times produced Mn4+, altered the Mn bonding environment, and induced a larger release of Mn from the sediments into porewater. This increased oxidation of Mn, change in Mn bonding environment, and additional release of Mn from the sediments under the anoxic + algae condition likely occurred because of the increased formation of organo-Mn complexes produced during enhanced enzymatic processes with the presence of the additional organic matter. The increased microbial activity and Mn mobility has the potential to increase the release of Mn from the sediments and into the lake water column.

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

Mode of access: World Wide Web

ISBN: 9798351406985Subjects--Topical Terms:

794747
Water resources management.
Subjects--Index Terms:

Bonding environmentIndex Terms--Genre/Form:

542853
Electronic books.

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520 $a The mobility of a metal in mining-impacted sediments is determined by the environmental conditions that influence the metal's oxidation state and bonding environment. Coeur d'Alene Lake of northern Idaho, USA, has been impacted by legacy mining practices that allowed the hydrologic transport of mining waste to the lakebed, which resulted in the deposition of an estimated 75 Mt of metal(loid)-rich sediments containing As, Cd, Fe, Mn, Pb, and Zn over the past 100+ years. Future lake conditions may include substantial algal blooms and deposition of additional algal detritus to the sediment-water interface, which may alter metal remobilization/retention during seasonal anoxia. Cores of the lake sediments were exposed to anoxic and anoxic + algae conditions for eight weeks. Over the eight-week period and at a location 12.5 cm deep in the sediments, anoxic and anoxic + algae conditions produced relatively stable Fe and Mn oxidation states and bonding environments. At a location 2.5 cm below the sediment-water interface, anoxic conditions promoted a relatively stable environment in which Fe and Mn oxidation states did not vary greatly during the experiment. At the 2.5-cm depth, the anoxic + algae condition substantially altered the Mn oxidation state distribution and bonding environment, but this condition did not strongly influence the Fe oxidation state distribution or bonding environment. The addition of algal detritus increased the presence of Mn3+, at select times produced Mn4+, altered the Mn bonding environment, and induced a larger release of Mn from the sediments into porewater. This increased oxidation of Mn, change in Mn bonding environment, and additional release of Mn from the sediments under the anoxic + algae condition likely occurred because of the increased formation of organo-Mn complexes produced during enhanced enzymatic processes with the presence of the additional organic matter. The increased microbial activity and Mn mobility has the potential to increase the release of Mn from the sediments and into the lake water column.
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653 $a Manganese
653 $a Mining
653 $a Oxidation
653 $a X-ray absorption spectroscopy
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