Harvey, Omar2022-04-252022-04-252022-04-22https://repository.tcu.edu/handle/116099117/52524Organic matter (OM) is complex with controlling roles in global carbon, nutrient and contaminant cycling. The first part of this study combines 2D- (2D-PCFS) and time-resolved fluorescence spectroscopy in characterizing OM from fire- and non-fire-processed sources. Fire- and non-fire-processed OM produced 2D-PCFS spectra that were respectively, blue- and red-shifted compared to their unprocessed counterparts. Blue shift increased with burn temperature which was positively correlated to intensity-weighted lifetime of water-extracted OM components. The lifetime-temperature relationship was used to predict fire temperatures at tree- and field-scales. The second part of this study combines energetics data from flow adsorption microcalorimetry (FAMC) with 2D-PCFS and UV-vis spectroscopy to assess sorptive characteristics of fire- versus non-fire-processed OM on ferrihydrite. Energetics and kinetics data showed that OM-ferrihydrite interactions had both endothermic and exothermic steps with rates that were pH dependent and inversely related to the energy of reaction. No evidence of ferrihydrite-induced OM changes were observed.Format: OnlineenGeochemistry [0996] - primaryEnvironmental geology [0407]Geology [0372]Environmental engineeringEnvironmental geologyGeochemistryGeologyText