Natural organic matter and their binding to iron (iii) hydr(oxides) as studied by fluorescence spectroscopy and flow adsorption microcalorimetryShow full item record
|Natural organic matter and their binding to iron (iii) hydr(oxides) as studied by fluorescence spectroscopy and flow adsorption microcalorimetry
|Master of Science
|Organic 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.
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