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Photochemical production of superoxide and hydrogen peroxide from natural organic matter

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TLDR
In this article, the Suwannee River fulvic acid (SRFA) at pH 8.1 was irradiated with simulated sunlight and showed that superoxide decayed through both uncatalysed disproportionation and an oxidative pathway that did not result in hydrogen peroxide production.
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This article is published in Geochimica et Cosmochimica Acta.The article was published on 2011-08-01. It has received 137 citations till now. The article focuses on the topics: Hydrogen peroxide & Superoxide.

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Triplet state dissolved organic matter in aquatic photochemistry: reaction mechanisms, substrate scope, and photophysical properties

TL;DR: It is proposed that through the use of appropriate sets of probe compounds and model photosensitizers an improved estimation of the distribution of triplet energies and one-electron reduction potentials of 3CDOM* can be achieved.
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The importance of charge-transfer interactions in determining chromophoric dissolved organic matter (CDOM) optical and photochemical properties

TL;DR: This review summarizes current understanding of the processes underlying CDOM photophysics and photochemistry as well as their physical basis.
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Spot the Difference: Engineered and Natural Nanoparticles in the Environment—Release, Behavior, and Fate

TL;DR: It is the aim of this Review to critically compare naturally observed processes with those found for engineered systems to identify the "nanospecific" properties of manufactured particles and describe critical knowledge gaps relevant for the risk assessment of manufactured nanomaterials in the environment.
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Photochemistry of Dissolved Black Carbon Released from Biochar: Reactive Oxygen Species Generation and Phototransformation.

TL;DR: Dissolved black carbon released from biochar decreased its ability to further generate ROS due to lower light absorption, which has significant implications on the environmental fate of dissolved BC and that of priority pollutants.
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Photogeneration of reactive oxygen species from biochar suspension for diethyl phthalate degradation

TL;DR: In this article, the authors investigated the photogeneration of reactive oxygen species (ROS) from biochar suspension by using FTIR, Raman, XPS and electron paramagnetic resonance (EPR) techniques.
References
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Journal ArticleDOI

Reactivity of HO[2]/O[2][-] radicals in aqueous solution

TL;DR: In this article, the superoxide radical (HO2⇄O−2 +H+, pK=4.8) in aqueous solution has been critically assessed and the rate constants for reactions of O−2 and HO2 with more than 300 organic and inorganic ions, molecules and other transient species have been tabulated.
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Fluorescence spectroscopy reveals ubiquitous presence of oxidized and reduced quinones in dissolved organic matter.

TL;DR: Results provide new insight into the redox reactivity of DOM and have implications for the application of fluorescence spectroscopy as a tool to characterize DOM.
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A Stable Nonfluorescent Derivative of Resorufin for the Fluorometric Determination of Trace Hydrogen Peroxide: Applications in Detecting the Activity of Phagocyte NADPH Oxidase and Other Oxidases

TL;DR: The enzymatic determination of hydrogen peroxide can be accomplished with high sensitivity and specificity using N-acetyl-3, 7-dihydroxyphenoxazine (Amplex Red), a highly sensitive and chemically stable fluorogenic probe for the enzymatics determination of H2O2.
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Rate Constants for the Decay and Reactions of the Lowest Electronically Excited Singlet State of Molecular Oxygen in Solution. An Expanded and Revised Compilation

TL;DR: An expanded and revised compilation on the reactivity of singlet oxygen, the lowest electronically excited singlet state of molecular oxygen, 1O2*(1Δg), in fluid solution is presented in this paper.
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