Bigalke, Moritz ; Weyer, Stefan ; Wilcke, Wolfgang (2010)
Copper Isotope Fractionation during Complexation with Insolubilized Humic Acid.
In: Environmental Science & Technology, 44 (14)
doi: 10.1021/es1017653
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The bioavailability, mobility, and toxicity of Cu depend on Cu speciation in solution. In natural systems like soils, sediments, lakes, and river waters, organo-Cu complexes are the dominating species. Organo-complexation of Cu may cause a fractionation of stable Cu isotopes. The knowledge of Cu isotope fractionation during sorption on humic acid may help to better understand Cu isotope fractionation in natural environments and thus facilitate the use of Cu stable isotope ratios (δ65Cu) as tracer of the fate of Cu in the environment. We therefore studied Cu isotope fractionation during complexation with insolubilized humic acid (IHA) as a surrogate of humic acid in soil organic matter with the help of sorption experiments at pH 2−7. We used NICA-Donnan chemical speciation modeling to describe Cu binding on IHA and to estimate the influence of Cu binding to different functional groups on Cu isotope fractionation. The observed overall Cu isotope fractionation at equilibrium between the solution and IHA was Δ65CuIHA-solution = 0.26 ± 0.11‰ (2SD). Modeled fractionations of Cu isotopes for low- (LAS) and high-affinity sites (HAS) were identical with Δ65CuLAS/HAS-solution = 0.27. pH did not influence Cu isotope fractionation in the investigated pH range.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2010 |
| Autor(en): | Bigalke, Moritz ; Weyer, Stefan ; Wilcke, Wolfgang |
| Art des Eintrags: | Bibliographie |
| Titel: | Copper Isotope Fractionation during Complexation with Insolubilized Humic Acid |
| Sprache: | Englisch |
| Publikationsjahr: | 2010 |
| Verlag: | ACS |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Environmental Science & Technology |
| Jahrgang/Volume einer Zeitschrift: | 44 |
| (Heft-)Nummer: | 14 |
| DOI: | 10.1021/es1017653 |
| Kurzbeschreibung (Abstract): | The bioavailability, mobility, and toxicity of Cu depend on Cu speciation in solution. In natural systems like soils, sediments, lakes, and river waters, organo-Cu complexes are the dominating species. Organo-complexation of Cu may cause a fractionation of stable Cu isotopes. The knowledge of Cu isotope fractionation during sorption on humic acid may help to better understand Cu isotope fractionation in natural environments and thus facilitate the use of Cu stable isotope ratios (δ65Cu) as tracer of the fate of Cu in the environment. We therefore studied Cu isotope fractionation during complexation with insolubilized humic acid (IHA) as a surrogate of humic acid in soil organic matter with the help of sorption experiments at pH 2−7. We used NICA-Donnan chemical speciation modeling to describe Cu binding on IHA and to estimate the influence of Cu binding to different functional groups on Cu isotope fractionation. The observed overall Cu isotope fractionation at equilibrium between the solution and IHA was Δ65CuIHA-solution = 0.26 ± 0.11‰ (2SD). Modeled fractionations of Cu isotopes for low- (LAS) and high-affinity sites (HAS) were identical with Δ65CuLAS/HAS-solution = 0.27. pH did not influence Cu isotope fractionation in the investigated pH range. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften > Fachgebiet Bodenmineralogie und Bodenchemie |
| Hinterlegungsdatum: | 08 Dez 2022 11:39 |
| Letzte Änderung: | 08 Dez 2022 11:39 |
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