Publication:
Measurement and implications of nonphotochemically generated superoxide in the equatorial pacific ocean

dc.contributor.author Rose, Andrew en_US
dc.contributor.author Webb, E en_US
dc.contributor.author Waite, T en_US
dc.contributor.author Moffett, J en_US
dc.date.accessioned 2021-11-25T14:14:19Z
dc.date.available 2021-11-25T14:14:19Z
dc.date.issued 2008 en_US
dc.description.abstract Superoxide, formed by the single electron reduction of oxygen, is important due to its ability to act as a mild reductant under typical environmental conditions. Using chemiluminescence detection with the reagent methyl Cypridina luciferin analog (MCLA), we have measured superoxide at picomolar concentrations in the water column of the Costa Rica Dome (CRD) seasonal upwelling region of the eastern equatorial Pacific Ocean. After 0.45 μm filtration, superoxide decayed in a pseudofirst order manner but more slowly than expected (rate constants varied from -4 to 9.7 × 10-3 s -1), which we hypothesize is due to complexation of metals that could otherwise scavenge superoxide, and the noncatalytic nature of superoxide decay at subnanomolar concentrations. Depth profiles revealed a particle-associated and nonphotochemically generated source of superoxide, implicating biological processes in its production. Superoxide in surface waters exhibited a diel cycle but concentrations were comparable to those in samples stored in the dark for at least 30 min, suggesting that the nonphotochemical source may dominate over abiotic photochemical superoxide production in the CRD. Elevated concentrations of superoxide in localized zones of the ocean may promote the reduction of several biologically important trace metals, thereby increasing their solubility and potential bioavailability. © 2008 American Chemical Society. en_US
dc.identifier.uri http://hdl.handle.net/1959.4/42272
dc.language English
dc.language.iso EN en_US
dc.rights CC BY-NC-ND 3.0 en_US
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/3.0/au/ en_US
dc.source Legacy MARC en_US
dc.subject.other Bioavailability en_US
dc.subject.other Complexation en_US
dc.subject.other Detection method en_US
dc.subject.other Diel variation en_US
dc.subject.other Diel variation en_US
dc.subject.other Diel variation en_US
dc.subject.other Diel variation en_US
dc.subject.other Diel variation en_US
dc.subject.other Diel variation en_US
dc.subject.other Diel variation en_US
dc.subject.other Diel variation en_US
dc.subject.other Diel variation en_US
dc.subject.other Diel variation en_US
dc.subject.other Diel variation en_US
dc.title Measurement and implications of nonphotochemically generated superoxide in the equatorial pacific ocean en_US
dc.type Journal Article en
dcterms.accessRights metadata only access
dspace.entity.type Publication en_US
unsw.accessRights.uri http://purl.org/coar/access_right/c_14cb
unsw.relation.faculty Engineering
unsw.relation.ispartofissue 7 en_US
unsw.relation.ispartofjournal Environmental Science and Technology en_US
unsw.relation.ispartofpagefrompageto 2387-2393 en_US
unsw.relation.ispartofvolume 42 en_US
unsw.relation.originalPublicationAffiliation Rose, Andrew, Civil & Environmental Engineering, Faculty of Engineering, UNSW en_US
unsw.relation.originalPublicationAffiliation Webb, E en_US
unsw.relation.originalPublicationAffiliation Waite, T, Civil & Environmental Engineering, Faculty of Engineering, UNSW en_US
unsw.relation.originalPublicationAffiliation Moffett, J en_US
unsw.relation.school School of Civil and Environmental Engineering *
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