The Photochemical Formation of Hydrogen Peroxide in Lakes. A thesis submitted to the Faculty of Graduate Studies in partial fulfillment of the requirements for the degree of Master of Science Graduate Programme in Biology York University. Scully, N., M. Ph.D. Thesis, 1994.
abstract   bibtex   
The interaction of dissolved organic carbon (DOC), and ultaviolet radiation on the photochemical formation of hydrogen peroxide (H202) in lake waters was studied along a latitudinal gradient. The water samples were irradiated and the formation rates of H202 measured then plotted against DOC, dissolved organic carbon fluorescence (DOCFL) and absorbance coefficients at 310 (Ka310) . The relationship between DOC and H202 formation rates was significant and best fit a power function (H202 = 49.65 DOC1,71; r2 = 0.94). The relationship between DOCFL (H202 = 118.32 + 33.06DOCFL; r2 = 0.98) and Ka310 (H202 = 72.54 + 77.51Ka310; r2 = 0.95) and H202 formation were both linear. The attenuation of UV radiation was studied in lakes chosen to provide a wide range of conditions. Lakes varied from lakes with low levels of DOC to highly coloured bog lakes. The series of lakes also varied in levels of chlorophyll a (CHLa) and particulate organic carbon (POC). Using a spectroradiometer, depth profiles of radiation spectra were measured and attenuation coefficients calculated. Attenuation coefficients were calculated for UV- B (280 - 320 nm) and UV-A (320 - 400 nm) radiation. There was a significant relationship between DOC and both UV-B (KdlB = 0.415 DOC1'86; r2 = 0.97) and UV-A (KdIA = 0.299 DOC1'53; r2 = 0.95) attenuation coefficients which could be best described by a power function. The relationship between DOCFL and UV-B (KdtB = 0.0778 + 0.477DOCFL; r2 = 0.96) and UV-A (KdIA = 0.226 + 0.174DOCFL; r2 = 0.96) attenuation coefficients were linear. There was a weak significant relationship between POC and both UV-B (KdIB = 2.063 + 0.704 InPOC? r2 = 0.47) and UV-A (KdIA = 1.208 + 0.726 InPOC; r2 = 0.54) attenuation coefficients. H202 was modelled on an areal basis in lakes. Decay corrected areal accumulations of H202 were calculated, and cumulative H202 production curves calculated and compared to that predicted from H202 formation efficiencies, cumulative UV photon fluxes and UV attenuation coefficients. Cumulative daily concentrations (mg m'2 d"1) were calculated for temperate lakes, Great Lakes and arctic lakes.
@phdthesis{
 title = {The Photochemical Formation of Hydrogen Peroxide in Lakes. A thesis submitted to the Faculty of Graduate Studies in partial fulfillment of the requirements for the degree of Master of Science Graduate Programme in Biology York University},
 type = {phdthesis},
 year = {1994},
 institution = {York University},
 department = {Biology},
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 last_modified = {2020-06-12T18:59:03.401Z},
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 abstract = {The interaction of dissolved organic carbon (DOC), and ultaviolet radiation on the photochemical formation of hydrogen peroxide (H202) in lake waters was studied along a latitudinal gradient. The water samples were irradiated and the formation rates of H202 measured then plotted against DOC, dissolved organic carbon fluorescence (DOCFL) and absorbance coefficients at 310 (Ka310) . The relationship between DOC and H202 formation rates was significant and best fit a power function (H202 = 49.65 DOC1,71; r2 = 0.94). The relationship between DOCFL (H202 = 118.32 + 33.06DOCFL; r2 = 0.98) and Ka310 (H202 = 72.54 + 77.51Ka310; r2 = 0.95) and H202 formation were both linear. The attenuation of UV radiation was studied in lakes chosen to provide a wide range of conditions. Lakes varied from lakes with low levels of DOC to highly coloured bog lakes. The series of lakes also varied in levels of chlorophyll a (CHLa) and particulate organic carbon (POC). Using a spectroradiometer, depth profiles of radiation spectra were measured and attenuation coefficients calculated. Attenuation coefficients were calculated for UV- B (280 - 320 nm) and UV-A (320 - 400 nm) radiation. There was a significant relationship between DOC and both UV-B (KdlB = 0.415 DOC1'86; r2 = 0.97) and UV-A (KdIA = 0.299 DOC1'53; r2 = 0.95) attenuation coefficients which could be best described by a power function. The relationship between DOCFL and UV-B (KdtB = 0.0778 + 0.477DOCFL; r2 = 0.96) and UV-A (KdIA = 0.226 + 0.174DOCFL; r2 = 0.96) attenuation coefficients were linear. There was a weak significant relationship between POC and both UV-B (KdIB = 2.063 + 0.704 InPOC? r2 = 0.47) and UV-A (KdIA = 1.208 + 0.726 InPOC; r2 = 0.54) attenuation coefficients. H202 was modelled on an areal basis in lakes. Decay corrected areal accumulations of H202 were calculated, and cumulative H202 production curves calculated and compared to that predicted from H202 formation efficiencies, cumulative UV photon fluxes and UV attenuation coefficients. Cumulative daily concentrations (mg m'2 d"1) were calculated for temperate lakes, Great Lakes and arctic lakes.},
 bibtype = {phdthesis},
 author = {Scully, Norman Michel}
}
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