title: Cd isotope fractionation during simulated and natural weathering.
abstract: In practice, stable Cd isotope ratios are being applied to trace pollution sources in the natural environment. However, Cd isotope fractionation during weathering processes is not yet fully understood. We investigated Cd isotope fractionation of PbZn ore in leaching experiments and in the environment under natural weathering processes. Our leaching experiments demonstrated that the leachate was enriched with heavy Cd isotopes, relative to initial and residual samples (Δ(114/110)Cdleachate - initial state = 0.40-0.50‰, Δ(114/110)Cdleachate -residual state = 0.36-0.53‰). For natural samples, δ(114/110)Cd values of stream sediments were higher than those of the corresponding soil samples collected from the riverbank, Δ(114/110)Cdstream sediment -soil can be up to 0.50‰. This observation is consistent with our leaching experiments, which indicate significant Cd isotope fractionation during natural weathering processes. Therefore, natural contributions should be considered when using Cd isotopes to trace anthropogenic pollution in water and sediment systems.
authors.affiliation: State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China.
authors.forename: Yuxu
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China. Electronic address: wenhanjie@vip.gyig.ac.cn.
authors.forename: Hanjie
authors.initials: H
authors.lastname: Wen
authors.affiliation: State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China.
authors.forename: Chuanwei
authors.initials: C
authors.lastname: Zhu
authors.affiliation: State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China.
authors.forename: Haifeng
authors.initials: H
authors.lastname: Fan
authors.affiliation: State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China.
authors.forename: Chongguang
authors.initials: C
authors.lastname: Luo
authors.affiliation: State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China; University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Liu
authors.affiliation: Centre de Recherches Petrographique et Geochimiques, CNRS/UMR 7358, 15, Rue Notre-Dame-Pauvres, B. P. 20, 54501 Vandoeuvre-les-Nancy Cedex, France.
authors.forename: Christophe
authors.initials: C
authors.lastname: Cloquet
mesh_terms: D002104:Cadmium / Q000032:analysis / Q000737:chemistry*; D005591:Chemical Fractionation; D004784:Environmental Monitoring / Q000379:methods*; D004787:Environmental Pollution / Q000032:analysis*; D019015:Geologic Sediments / Q000737:chemistry; D007554:Isotopes; D007854:Lead / Q000032:analysis / Q000737:chemistry*; D008906:Mining; D012987:Soil / Q000737:chemistry; D014887:Weather; D015032:Zinc / Q000032:analysis / Q000737:chemistry*
chemical_list: D007554:Isotopes; D012987:Soil; D002104:Cadmium; D007854:Lead; D015032:Zinc
keywords: Cd isotope fractionation; Leaching experiment; Pollution sources; Weathering processes