Master of Science (MS)
First Committee Member
Spencer M. Steinberg
Number of Pages
Lignin distribution in sediment is a useful tool for tracing the transport of land derived organic matter in an aquatic environment. Tetramethylammonium hydroxide (TMAH) thermochemolysis at sub-pyrolysis temperatures of 300Ã‚Â°C followed by GC-MS analysis showed a great promise in being able to semi quantitatively assess the nature of organic carbon in sediments. TMAH chemopyrolysis produces methylated syringyl (S), vanillyl (V), and cinnamyl (C) phenols from lignin, these methylated phenols are an indirect measure of lignin in sediment. The concentration of lignin phenols is indicative of the contribution of terrestrial runoff to lake sediments because lignin is exclusively a product of land plants. The S/V ratio is a powerful tool to trace the terrestrial origin of organic matter in sediment; Two chemolysis methods (on-line and off-line) were examined and compared. Organic carbon and lignin in several cores from Lake Mead were investigated. The results from sediment cores indicate significant variations in the sources of sedimentary materials. The concentration of organic carbon and the composition and amount of lignin provides an interpretable record of historical changes.
Carbon; Lake; Lignin; Mead; Measurement; Organic; Sediment
Chemistry, Analytic; Soil science
University of Nevada, Las Vegas
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Nemr, Ekhlas Lisa, "Measurement of lignin and organic carbon in Lake Mead sediment" (2004). UNLV Retrospective Theses & Dissertations. 1651.