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Full-Text Articles in Chemistry
Study Of The Effects Of Co2(G) On The Fe(Ii)-Luminol Chemiluminescence System: Application To Ultra-Trace Analysis Of Fe(Ii), Sara Beth Lovitz
Study Of The Effects Of Co2(G) On The Fe(Ii)-Luminol Chemiluminescence System: Application To Ultra-Trace Analysis Of Fe(Ii), Sara Beth Lovitz
Honors Theses
The Fe(II)-catalyzed oxidation of luminol has been a well-accepted chemiluminescence method for the trace and ultra-trace analysis of Fe(II) and Fe(III) in natural waters. Investigation into this chemiluminescence system has shown that COlg) is essential to Fe-catalyzed luminol chemiluminescence. In absence of CO2(g) there is no chemiluminescent signal. These reactions worked well in the past because CO2 is present in most laboratory H20 supplies. Intentional saturation of CO2 results in a 5-fold increase for this conventional system. We propose a mechanism for CO 2(g) enhancement that includes formation of a CO2-superoxide intermediate, which serves as the oxidant of luminol to …
Determination Of Hydroxyl Radical Production Rates In Natural Waters Using The Fluorometric Reagent P-Hydroxyphenylacetic Acid, Jason D. Hosmer
Determination Of Hydroxyl Radical Production Rates In Natural Waters Using The Fluorometric Reagent P-Hydroxyphenylacetic Acid, Jason D. Hosmer
Honors Theses
A means of determining hydroxyl radical production rates in natural waters through the formation of a directly detectable fluorescent product has been developed. A method similar to the enzyme mediated oxidation of phydroxyphenylacetic acid by hydrogen peroxide is used (Miller and Kester, 1988). Due to the high reactivity of hydroxyl radicals, and subsequently low steady state concentrations, direct detection is very difficult. In the past detection was achieved through the introduction of a probe, usually a substituted aromatic or alcohol, that decays away at an observable rate upon reaction with hydroxyl radicals. Detection limits and accuracy of such difference based …
Investigations Of Iron Cycling In Aquatic Systems, Heather A. Lounsbury
Investigations Of Iron Cycling In Aquatic Systems, Heather A. Lounsbury
Honors Theses
A fully automated luminal-based chemiluminescence flow injection analysis system has been developed for rapid detection of Fe(IT) at natural levels in natural water systems. Similar detection limits are achieved for H202 by fluorometry using an enzyme mediated oxidation of the reagent p-hydroxyphenylacetic acid. Using these analytical systems, the rates of Fe(IT) oxidation by dissolved oxygen in 0.7 M NaO have been measured for nanomolar concentrations of Fe(II) over the pH range 7.0 to 8.3. When the production and decomposition of H202 in the system were considered, measured rates were in excellent agreement with a model based on previously reported rate …