By a News Reporter-Staff News Editor at Ecology, Environment & Conservation -- Research findings on Environmental Science and Technology are discussed in a new report. According to news reporting out of Dubendorf, Switzerland, by VerticalNews editors, research stated, "Natural organic matter (NOM) exerts strong influence on copper speciation and bioavailability in soils and aquatic systems. In redox-dynamic environments, electron transfer reactions between copper and redox-active moieties of NOM may trigger Cu(I) and Cu(0) formation."
Our news journalists obtained a quote from the research from the Swiss Federal Institute of Aquatic Science and Technology, "To date, little is known about Cu-NOM redox interactions and Cu(1) binding to NOM. Here, we present X-ray absorption spectroscopy results on copper redox transformations upon addition of Cu(II) or Cu(I)to untreated and electrochemically reduced soil humic acid (HA) under oxic and anoxic conditions. Both untreated and reduced HA mediated copper redox transformations. Under anoxic conditions, Cu(II) and Cu(I) added to reduced HA were primarily complexed and thereby stabilized as Cu(I)-HA at low loadings, whereas high copper loadings resulted in the additional formation of Cu(0) nanoparticles (16-64% of total copper). Cu(I) bound to HA was predominantly 2-fold coordinated and to a lower extent 3- to 4-fold coordinated, with a contribution of at least one nitrogen and/or sulfur ligand group. Under oxic conditions, Cu(II)-HA complexes prevailed, but smaller fractions of copper were also stabilized as Cu(I)-HA in a 3- to 4-fold coordination."
According to the news editors, the research concluded: "Our results show that Cu-HA redox interactions are strongly affected by binding of Cu(II) and Cu(I) to HA and that HA contributes to the stabilization of Cu(I) against disproportionation."
For more information on this research see: Copper Redox Transformation and Complexation by Reduced and Oxidized Soil Humic Acid. 1. X-ray Absorption Spectroscopy Study. Environmental Science & Technology, 2013;47(19):10903-10911. Environmental Science & Technology can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Environmental Science & Technology - www.pubs.acs.org/journal/esthag)
Our news journalists report that additional information may be obtained by contacting B. Fulda, Eawag, Swiss Fed Inst Aquat Sci & Technol, CH-8600 Dubendorf, Switzerland. Additional authors for this research include A. Voegelin, F. Maurer, I. Christl and R. Kretzschmar.
Keywords for this news article include: Europe, Dubendorf, Switzerland, Environmental Science and Technology
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