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Characterizing the Molecular Structure and Reactivity of Natural Organic Matter in The Everglades

Mangroves are the dominant vegetation in Everglades estuarine environment and are known to contain polyphenols such as tannins, which present similar fluorescence properties as some amino acid fluorophores. In the present study, gas chromatography–mass spectrometry (GC/MS) was used to quantify gallic acid, which is a normal monomer of polyphenols. The quantitative GC/MS analytical method was developed using gallic acid and tannic acid standards to quantify the false ‘protein-like’ fluorescence in DOM. The present study also compared the optical properties, reactive species (RS) production and radical scavenging ability of DOM from different regions of the Everglades and a correlation was observed between DOM composition and its photo-productivity. In general, the reactive species quantum yield decreased with increased DOM redox potential. The RS formation rates were controlled by the DOC and CDOM abundace. Normalized RS formation rates were shown to be influenced by DOM aromaticity and molecular weight characteristics

Identiferoai:union.ndltd.org:fiu.edu/oai:digitalcommons.fiu.edu:etd-3707
Date27 April 2016
CreatorsHuang, Wenxi
PublisherFIU Digital Commons
Source SetsFlorida International University
Detected LanguageEnglish
Typetext
Formatapplication/pdf
SourceFIU Electronic Theses and Dissertations

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