THE PHOTOCHEMICAL FORMATION OF HYDROGEN PEROXIDE

1932 ◽  
Vol 54 (11) ◽  
pp. 4460-4461 ◽  
Author(s):  
A. L. Marshall
Keyword(s):  
Hydrogen Peroxide ◽  
Photochemical Formation

scholarly journals The role of polysaccharides and diatom exudates in the redox cycling of Fe and the photoproduction of hydrogen peroxide in coastal seawaters

2009 ◽  
Vol 6 (4) ◽  
pp. 7789-7819 ◽  
Author(s):  
S. Steigenberger ◽  
P. J. Statham ◽  
C. Völker ◽  
U. Passow
Keyword(s):  
Hydrogen Peroxide ◽  
Coastal Waters ◽  
Phaeodactylum Tricornutum ◽  
Laboratory Experiments ◽  
Uv Light ◽  
H2o2 Production ◽  
Initial Value ◽  
Photochemical Formation ◽  
Algal Exudates

Abstract. The effect of artificial acidic polysaccharides (PS) and exudates of Phaeodactylum tricornutum on the half-life of Fe(II) in seawater was investigated in laboratory experiments. Strong photochemical hydrogen peroxide (H2O2) production of 5.2 to 10.9 nM (mg C)−1 h−1 was found in the presence of PS and diatom exudates. Furthermore when illuminated with UV light the presence of algal exudates had a net stabilising effect on ferrous iron in seawater (initial value 100 nmol L−1) above that expected from oxidation kinetics. In the dark the PS gum xanthan showed no stabilising effect on Fe(II). The photochemical formation of superoxide (O2−) in presence of diatom exudates and its reducing effect on Fe(III) appears to result in greater than expected concentrations of Fe(II). A model of the photochemical redox cycle of iron incorporating these processes supported the observed data well. Diatom exudates seem to play an important role for the photochemistry of iron in coastal waters.

scholarly journals The role of polysaccharides and diatom exudates in the redox cycling of Fe and the photoproduction of hydrogen peroxide in coastal seawaters

2010 ◽  
Vol 7 (1) ◽  
pp. 109-119 ◽  
Author(s):  
S. Steigenberger ◽  
P. J. Statham ◽  
C. Völker ◽  
U. Passow
Keyword(s):  
Hydrogen Peroxide ◽  
Coastal Waters ◽  
Phaeodactylum Tricornutum ◽  
Laboratory Experiments ◽  
Uv Light ◽  
H2o2 Production ◽  
Initial Value ◽  
Photochemical Formation ◽  
Algal Exudates

Abstract. The effect of artificial acidic polysaccharides (PS) and exudates of Phaeodactylum tricornutum on the half-life of Fe(II) in seawater was investigated in laboratory experiments. Strong photochemical hydrogen peroxide (H2O2) production of 5.2 to 10.9 nM (mg C)−1 h−1 was found in the presence of PS and diatom exudates. Furthermore when illuminated with UV light the presence of algal exudates had a net stabilising effect on ferrous iron in seawater (initial value 100 nmol L−1) above that expected from oxidation kinetics. In the dark the PS gum xanthan showed no stabilising effect on Fe(II). The photochemical formation of superoxide (O2−) in the presence of diatom exudates and its reducing effect on Fe(III) appears to result in greater than expected concentrations of Fe(II). A model of the photochemical redox cycle of iron incorporating these processes supported the observed data well. Diatom exudates seem to have the potential to play an important role for the photochemistry of iron in coastal waters.

scholarly journals Wavelength and temperature-dependent apparent quantum yields for photochemical formation of hydrogen peroxide in seawater

2014 ◽  
Vol 16 (4) ◽  
pp. 777-791 ◽  
Author(s):  
David J. Kieber ◽  
Gary W. Miller ◽  
Patrick J. Neale ◽  
Kenneth Mopper
Keyword(s):  
Hydrogen Peroxide ◽  
Light Dose ◽  
Quantum Yields ◽  
Temperature Dependent ◽  
Marine Waters ◽  
Photochemical Formation ◽  
Dose Dependent

Wavelength, temperature and light-dose dependent hydrogen peroxide photoproduction quantum yields were determined in subtropical, temperate and polar marine waters.

On the photochemical formation of peroxide in the system disodium Anthraquinone-2,6-disulfonate-methylviologen-water-ethanol-sodium hydroxide

1982 ◽  
Vol 35 (8) ◽  
pp. 1723 ◽  
Author(s):  
AWH Mau ◽  
WHF Sasse
Keyword(s):  
Hydrogen Peroxide ◽  
Sodium Hydroxide ◽  
Spectroscopic Evidence ◽  
Photochemical Formation ◽  
Title System

Reduction of oxygen by anthraquinone radicals is shown to be responsible for the formation of hydrogen peroxide in the title system. Spectroscopic evidence indicates that the hydroquinone is formed by photoreduction of the anthraquinone through sequential one-electron steps.

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