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Characterization of dissolved organi...

Michigan State University.

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Characterization of dissolved organic carbon: Assessment of copper complexation and export of carbon from watersheds as a function of land use.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Characterization of dissolved organic carbon: Assessment of copper complexation and export of carbon from watersheds as a function of land use./
作者:	McElmurry, Shawn P.
面頁冊數:	262 p.
附註:	Adviser: Thomas C. Voice.
Contained By:	Dissertation Abstracts International69-09B.
標題:	Biogeochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3331972
ISBN:	9780549837657

Characterization of dissolved organic carbon: Assessment of copper complexation and export of carbon from watersheds as a function of land use.
McElmurry, Shawn P.

Characterization of dissolved organic carbon: Assessment of copper complexation and export of carbon from watersheds as a function of land use. - 262 p.

Adviser: Thomas C. Voice.

Thesis (Ph.D.)--Michigan State University, 2008.

Dissolved organic carbon (DOC) is a critical component of freshwater ecosystems and influences the transport of many pollutants. The aim of this work is to assess DOC characteristics, to determine if these characteristics influence the complexation of copper, and to identify the influence of land use on DOC characteristics. A method utilizing solid-phase extraction is developed to simultaneously quantify DOC fractions and copper-DOC complexes. Fractions are based on specific bonding mechanisms (hydrogen, donor-acceptor, London dispersion, and ionic bonding) thought to be responsible for stabilizing humic substances in aqueous solutions. This method produces different fractions for a range of natural DOC and standardized humic materials. Using this method, complexation constants for copper are derived for individual fractions of DOC and these are found to be similar to those reported elsewhere for bulk DOC using more intensive analytical techniques. Additionally, the complexation of copper by high and low molecular weight fractions of DOC is related to the amount of aromatic structure and oxygen functional groups present in DOC samples.

ISBN: 9780549837657Subjects--Topical Terms:

545717
Biogeochemistry.

Characterization of dissolved organic carbon: Assessment of copper complexation and export of carbon from watersheds as a function of land use.
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520 $a Dissolved organic carbon (DOC) is a critical component of freshwater ecosystems and influences the transport of many pollutants. The aim of this work is to assess DOC characteristics, to determine if these characteristics influence the complexation of copper, and to identify the influence of land use on DOC characteristics. A method utilizing solid-phase extraction is developed to simultaneously quantify DOC fractions and copper-DOC complexes. Fractions are based on specific bonding mechanisms (hydrogen, donor-acceptor, London dispersion, and ionic bonding) thought to be responsible for stabilizing humic substances in aqueous solutions. This method produces different fractions for a range of natural DOC and standardized humic materials. Using this method, complexation constants for copper are derived for individual fractions of DOC and these are found to be similar to those reported elsewhere for bulk DOC using more intensive analytical techniques. Additionally, the complexation of copper by high and low molecular weight fractions of DOC is related to the amount of aromatic structure and oxygen functional groups present in DOC samples.
520 $a The solid-phase extraction method is then used to investigate possible relationships between DOC characteristics and land use. By collecting surface water samples from sub-watersheds with unique land uses, statistically significant differences in DOC characteristics are observed. Sub-watersheds containing agricultural and forested land are found to produce DOC higher in molecular weight and aromatic structure than urban catchments. DOC from urban landscapes is found to be more hydrophobic than from other types of land use. Forested catchments produced DOC that is consistently different from that derived from the other types of land uses. In addition to land use, a limited number of environmental variables explain variations in DOC aromaticity, molecular weight and hydrophobicity. When combined with land use, the amount of solar radiation, precipitation and water temperature explain up to 80% of the variability observed in DOC characteristics. Results of this work suggest qualitative differences in DOC can influence copper complexation and the nature of DOC may vary significantly between surface waters as a result of land use.
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