Pathways of superoxide (o2–) decay in the eastern tropical north atlantic

Superoxide (O-2(-): IUPAC name dioxide (center dot 1-)) is an important transient reactive oxygen species (ROS) in the ocean formed as an intermediate in the redox transformation of oxygen (O-2) into hydrogen peroxide (H2O2) and vice versa. This highly reactive and very short-lived radical anion can...

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Bibliographic Details
Main Authors: Wuttig, Kathrin, Heller, Maija I., Croot, Peter L.
Format: Article in Journal/Newspaper
Language:unknown
Published: American Chemical Society (ACS) 2013
Subjects:
spatial variability
chattonella-marina
dismutase activity
hydrogen-peroxide
manganese oxides
coastal waters
surface waters
cu stress
seawater
complexes
North Atlantic
Online Access:http://hdl.handle.net/10379/14457
https://doi.org/10.13025/27669
https://doi.org/10.1021/es401658t
Description
Summary:Superoxide (O-2(-): IUPAC name dioxide (center dot 1-)) is an important transient reactive oxygen species (ROS) in the ocean formed as an intermediate in the redox transformation of oxygen (O-2) into hydrogen peroxide (H2O2) and vice versa. This highly reactive and very short-lived radical anion can be produced both via photochemical and biological processes in the ocean. In this paper we examine the decomposition rate of O-2(-) throughout the water column, using new data collected in the Eastern Tropical North Atlantic (ETNA) Ocean. For this approach we applied a semi factorial experimental design to identify and quantify the pathways of the major identified sinks in the ocean. In this work we occupied six stations, two on the West African continental shelf and four open ocean stations, including the CVOO time series site adjacent to Cape Verde. Our results indicate that, in the surface ocean impacted by Saharan aerosols and coastal sediment resuspension, the main decay pathways for superoxide are via reactions with Mn(II) and organic matter.

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