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Application of a superoxide (O2−) thermal source (SOTS-1) for the determination and calibration of O2− fluxes in seawater by M.I. Heller; P.L. Croot is a Chemistry article available to read on EtoBox.

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## Superoxide (O 2 -) is an important short lived transient reactive oxygen species (ROS) in seawater. The main source of O 2 -in the ocean is believed to be through photochemical reactions though biological processes may also be important. Sink terms for O 2 -include redox reactions with bioactive trace metals, including Cu and Fe, and to a lesser extent dissolved organic matter (DOM). Information on the source fluxes, sinks and concentration of superoxide in the open ocean are crucial to improving our understanding of the biogeochemical cycling of redox active species. As O 2 -is a highly reactive transient species present at low concentrations it is not a trivial task to make accurate and precise measurements in seawater. In this study we developed the appropriate numerical analysis tools and investigated a number of superoxide sources and methods for the purposes of calibrating O 2 -concentrations and/or fluxes specifically in seawater. We found the superoxide thermal source bis(4-carboxybenzyl)hyponitrite (SOTS)-1 easy to employ as a reliable source of O 2 -which could be successfully applied in seawater. The thermal decomposition of SOTS-1 in seawater was evaluated over a ran

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Author

M.I. Heller; P.L. Croot

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0003-2670)

Published

2010

Language

EN

Field

Chemistry (Physical Sciences)