Details
| Original language | English |
|---|---|
| Pages (from-to) | 5496-5502 |
| Number of pages | 7 |
| Journal | Environmental Science and Technology |
| Volume | 44 |
| Issue number | 14 |
| Publication status | Published - 15 Jul 2010 |
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 Δ65Cu IHA-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.
ASJC Scopus subject areas
- Chemistry(all)
- Environmental Science(all)
- Environmental Chemistry
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In: Environmental Science and Technology, Vol. 44, No. 14, 15.07.2010, p. 5496-5502.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Copper isotope fractionation during complexation with insolubilized humic acid
AU - Bigalke, Moritz
AU - Weyer, Stefan
AU - Wilcke, Wolfgang
PY - 2010/7/15
Y1 - 2010/7/15
N2 - 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 Δ65Cu IHA-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.
AB - 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 Δ65Cu IHA-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.
UR - http://www.scopus.com/inward/record.url?scp=77954600742&partnerID=8YFLogxK
U2 - 10.1021/es1017653
DO - 10.1021/es1017653
M3 - Article
C2 - 20557129
AN - SCOPUS:77954600742
VL - 44
SP - 5496
EP - 5502
JO - Environmental Science and Technology
JF - Environmental Science and Technology
SN - 0013-936X
IS - 14
ER -