The combined effect of thiols and solar radiation on the redox chemistry of iron in seawater

Show simple item record

dc.contributor Laglera Baquer, Luis Miguel
dc.contributor.author Wiedemann, Matthias
dc.date 2016
dc.date.accessioned 2018-05-30T11:32:45Z
dc.date.issued 2018-05-30
dc.identifier.uri http://hdl.handle.net/11201/146426
dc.description.abstract [eng] Objectives. In this work we have designed a set of experiments to define the mechanism how organic compounds with reduced Sulphur groups (RSS), commonly exudated by phytoplankton, have a modulating effect on the redox chemistry of iron in seawater. The studied organic compounds included several thiols, such as cysteine, cystine, glutathione, oxidized glutathione, 3-mercaptopropionic acid, thyoglicolic acid, and N-acetylcysteine and 2- aminoethanesulfonic acid (taurine). Methods. The first method evaluates the potential Fe(II) oxidation to Fe(III) after the complexation with organic compounds. Reaction is carried out in a flow system monitored using chemiluminescence detection with luminol. The second experimental setup involves Cathodic stripping voltammetry for the quantitative determination of thiol species to assess thiol stability when exposed to solar radiation. The third experiment evaluates whether solar radiation can promote the reduction of Fe(III) to Fe(II) in the presence of thiols by chemiluminescence detection. Results. Our data shows that some RSS have a strong effect stabilizing Fe(II) in seawater delaying its oxidation. The Cathodic Stripping Voltammetry results show a thiol photodegradation over time. Final results demonstrates a fast reduction from Fe(III) to Fe(II) when exposed to solar radiation, in presence of organic complexes containing reduced sulphurs. Conclusion. Based on our findings we propose possible mechanisms that explain the rapid reduction of Fe(III) to Fe(II) under simulated marine conditions, in which the solar radiation effect in presence of reduced sulphur compounds induces an electron shuttle that triggers the reduction of a functional group inside the natural Fe-Ligand complex. ca
dc.format application/pdf
dc.language.iso eng ca
dc.publisher Universitat de les Illes Balears
dc.rights info:eu-repo/semantics/openAccess
dc.rights all rights reserved
dc.subject 54 - Química ca
dc.subject 542 - Química pràctica de laboratori. Química preparativa i experimental ca
dc.title The combined effect of thiols and solar radiation on the redox chemistry of iron in seawater ca
dc.type info:eu-repo/semantics/masterThesis ca
dc.type info:eu-repo/semantics/publishedVersion
dc.date.updated 2018-05-17T12:06:11Z
dc.date.embargoEndDate info:eu-repo/date/embargoEnd/2050-01-01
dc.embargo 2050-01-01
dc.rights.accessRights info:eu-repo/semantics/embargoedAccess


Files in this item

This item appears in the following Collection(s)

Show simple item record