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Photochemistry and structure of envi...

Stabenau, Erik Robert.

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Photochemistry and structure of environmental macromolecules.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Photochemistry and structure of environmental macromolecules./
作者:	Stabenau, Erik Robert.
面頁冊數:	212 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0140.
Contained By:	Dissertation Abstracts International65-01B.
標題:	Environmental Sciences. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3119915

Photochemistry and structure of environmental macromolecules.
Stabenau, Erik Robert.

Photochemistry and structure of environmental macromolecules. - 212 p.

Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0140.

Thesis (Ph.D.)--University of Miami, 2003.

Presented is a novel combination of analytical techniques to make a direct determination of the molecular mass distribution of environmental macromolecules, focusing in particular on dissolved organic matter (DOM). Results from this new technique confirmed the presence of organic compounds in the 1000 to 2000 Da range that were indicated but not resolved using other methodologies. The application of a hydrophilic-lipophilic copolymer based extraction step reduced system bias due to variations in sample source, simplified extraction, and provided acceptable extraction efficiency. This combination of extraction and analysis allowed the determination of a correlation between absorbance and molecular mass distribution and abundance in river systems of southwestern Florida. A reduction in mean mass with environmental processing was observed. Investigation of an individual source of DOM, the degradation of the common seagrass Thalassia testudinum, revealed similar optical and mass spectral features as that observed in coastal DOM samples. A reduction in mean mass was observed during the photochemical processing of this material, which suggests that photochemistry may be responsible for the reduction in mean mass observed in coastal river samples. Implications for the calculation of mass distribution for DOM from satellite data and the need for future research into sources of DOM are discussed.Subjects--Topical Terms:

676987
Environmental Sciences.

Photochemistry and structure of environmental macromolecules.
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500 $a Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0140.
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502 $a Thesis (Ph.D.)--University of Miami, 2003.
520 $a Presented is a novel combination of analytical techniques to make a direct determination of the molecular mass distribution of environmental macromolecules, focusing in particular on dissolved organic matter (DOM). Results from this new technique confirmed the presence of organic compounds in the 1000 to 2000 Da range that were indicated but not resolved using other methodologies. The application of a hydrophilic-lipophilic copolymer based extraction step reduced system bias due to variations in sample source, simplified extraction, and provided acceptable extraction efficiency. This combination of extraction and analysis allowed the determination of a correlation between absorbance and molecular mass distribution and abundance in river systems of southwestern Florida. A reduction in mean mass with environmental processing was observed. Investigation of an individual source of DOM, the degradation of the common seagrass Thalassia testudinum, revealed similar optical and mass spectral features as that observed in coastal DOM samples. A reduction in mean mass was observed during the photochemical processing of this material, which suggests that photochemistry may be responsible for the reduction in mean mass observed in coastal river samples. Implications for the calculation of mass distribution for DOM from satellite data and the need for future research into sources of DOM are discussed.
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650 4 $a Chemistry, Analytical. $3 586156
650 4 $a Biogeochemistry. $3 545717
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