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Reactivity of inorganic Mn and Mn desferrioxamine B with O2, O2-, and H2O2 in seawater

Citation

Wuttig, K and Heller, MI and Croot, PL, Reactivity of inorganic Mn and Mn desferrioxamine B with O2, O2-, and H2O2 in seawater, Environmental Science and Technology, 47, (18) pp. 10257-10265. ISSN 0013-936X (2013) [Refereed Article]

Copyright Statement

Copyright 2013 American Chemical Society

DOI: doi:10.1021/es4016603

Abstract

Manganese (Mn) is a required element for oceanic phytoplankton as it plays a critical role in photosynthesis, through its unique redox chemistry, as the active site in photosystem II, and in enzymes that act as defenses against reactive oxygen species (ROS), most notably for protection against superoxide (O2), through the action of superoxide dismutase (SOD), and against hydrogen peroxide (H2O2) via peroxidases and catalases. The distribution and redox speciation of Mn in the ocean is also apparently controlled by reactions with ROS. Here we examine the connections between ROS and dissolved Mn species in the upper ocean using field and laboratory experimental data. Our results suggest it is unlikely that significant concentrations of Mn(III) are produced in the euphotic zone, as in the absence of evidence for the existence of strong Mn(III) ligands, Mn(II) reacts with O2 to form the short-lived transient manganous superoxide, MnO2+, which may react rapidly with other redox species in a manner similar to O2. Experiments with the strong Mn(III) chelator, desferrioxamine B (DFB), in seawater indicated that the Mn(III) species are unlikely to form, as formation of the precursor Mn(II) complex is hindered due to the stability of the Ca complex with DFB.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Chemical Oceanography
Objective Division:Environment
Objective Group:Physical and Chemical Conditions of Water
Objective Field:Physical and Chemical Conditions of Water not elsewhere classified
UTAS Author:Wuttig, K (Dr Kathrin Wuttig)
ID Code:103235
Year Published:2013
Web of Science® Times Cited:24
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2015-09-29
Last Modified:2017-11-01
Downloads:0

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