scholarly journals Singlet Oxygen Phosphorescence as a Probe for Triplet-State Dissolved Organic Matter Reactivity

2018 ◽  
Vol 52 (16) ◽  
pp. 9170-9178 ◽  
Author(s):  
Paul R. Erickson ◽  
Kyle J. Moor ◽  
Jeffrey J. Werner ◽  
Douglas E. Latch ◽  
William A. Arnold ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Triplet State ◽  
Singlet Oxygen

scholarly journals Triplet State Formation of Chromophoric Dissolved Organic Matter in Atmospheric Aerosols: Characteristics and Implications

2020 ◽  
Author(s):  
Qingcai Chen ◽  
Zhen Mu ◽  
Li Xu ◽  
Mamin Wang ◽  
Jin Wang ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Triplet State ◽  
Atmospheric Aerosols ◽  
Formation Rate ◽  
Chromophoric Dissolved Organic Matter ◽  
Biomass Combustion ◽  
Triplet States ◽  
Ambient Aerosols ◽  
Paramagnetic Resonance

Abstract. There is chromophore dissolved organic matter (CDOM) in the atmosphere, which may form triplet-state chromophoric dissolved organic matter (3CDOM*) to further driving the formation of reactive oxygen species (ROS) under solar illumination. 3CDOM* contributes significantly to aerosol photochemistry and plays an important role in aerosol aging. We quantify the ability to form 3CDOM* and drive the formation of ROS by primary, secondary and ambient aerosols. Biomass combustion has the strongest 3CDOM* generation capacity and the weakest vehicle emission capacity. Ambient aerosol has a stronger ability to generate 3CDOM* in winter than in summer. Most of the triplet states generation conform to first-order reaction, but some of them do not due to the different quenching mechanism. The structural-activity relationship between the CDOM type and the 3CDOM* formation capacity shows that the two types of CDOM identified, which similar to the nitrogen-containing chromophores contributed 88 % to the formation of 3CDOM*. The estimated formation rate of 3CDOM* can reach ~ 100 μmol m−3 h−1 in the atmosphere in Xi'an, China, which is approximately one hundred thousand-times the hydroxyl radical (•OH) production. This study verified that 3CDOM* drives at least 30 % of the singlet oxygen (1O2) and 31 % of the •OH formed by aerosols using the spin trapping and electron paramagnetic resonance technique.

Assessing the Source of the Photochemical Formation of Hydroxylating Species from Dissolved Organic Matter Using Model Sensitizers

2021 ◽  
Author(s):  
Kylie Couch ◽  
Frank Leresche ◽  
Claire Farmer ◽  
Garrett McKay ◽  
Fernando Rosario
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Singlet Oxygen ◽  
Natural Waters ◽  
Photochemical Formation ◽  
Photochemical Production

Dissolved organic matter (DOM) is ubiquitous in natural waters and can facilitate the chemi-cal transformation of many contaminants through the photochemical production of reactive inter-mediates, such as singlet oxygen (1O2),...

Singlet Oxygen in the Coupled Photochemical and Biochemical Oxidation of Dissolved Organic Matter

2010 ◽  
Vol 44 (10) ◽  
pp. 3683-3689 ◽  
Author(s):  
Rose M. Cory ◽  
Kristopher McNeill ◽  
James P. Cotner ◽  
Andre Amado ◽  
Jeremiah M. Purcell ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Singlet Oxygen ◽  
Biochemical Oxidation

scholarly journals Photogeneration of singlet oxygen and free radicals in dissolved organic matter isolated from the Mississippi and Atchafalaya River plumes

2000 ◽  
Vol 69 (1-2) ◽  
pp. 139-152 ◽  
Author(s):  
Sonya L.Holder Sandvik ◽  
Piotr Bilski ◽  
J.Dean Pakulski ◽  
Colin F. Chignell ◽  
Richard B. Coffin
Keyword(s):  
Organic Matter ◽  
Free Radicals ◽  
Dissolved Organic Matter ◽  
Singlet Oxygen ◽  
River Plumes ◽  
Atchafalaya River

scholarly journals Optical Properties and Photochemical Production of Hydroxyl Radical and Singlet Oxygen after Ozonation of Dissolved Organic Matter

2021 ◽  
Author(s):  
Frank Leresche ◽  
Jeremy Torres ◽  
Tyler Kurtz ◽  
Urs von Gunten ◽  
Fernando Rosario
Keyword(s):  
Organic Matter ◽  
Optical Properties ◽  
Dissolved Organic Matter ◽  
Hydroxyl Radical ◽  
Singlet Oxygen ◽  
Light Absorption ◽  
Absorption Properties ◽  
Photochemical Production ◽  
Photochemical Properties

This study focuses on the effects of ozonation on the optical and photochemical properties of dissolved organic matter (DOM). Upon ozonation, a decrease in light absorption properties of DOM was...

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