Zinc isotope effects by chromatographic chelating exchange resin

Ding, Xingcheng; Nomura, Masao; Fujii, Yasuhiko

doi:10.1016/j.pnucene.2009.06.003

Cited by 16 publications

(5 citation statements)

References 26 publications

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“…The degree of fractionation of neodymium isotopes takes the order; 150 Nd

. This tendency is the same as that observed in the chromatographic isotope separation of Ce [1] , Gd [2] , Zn [3,4] , Cu [7,8] and Eu [5,6] . Since the heavier isotope is enriched in the complex species, the observed isotopic enrichment tendency accords with the theoretically expected direction of the isotopic effects in chemical exchange.…”

Section: Resultssupporting

confidence: 84%

“…According to the new theory derived by Bigeleisen, this anomaly is believed to be due to the field shift [18] . Later on, similar odd–even isotope effects were found in Gd [2] , Zn [3,4,19–21] , Nd [9–11] and Cd [22] .…”

Section: Introductionsupporting

confidence: 55%

“…Separation of isotopes by ion exchange chromatography is one of the most effective chemical exchange methods, which is based on the chemical equilibrium between isotopic species distributed between the stationary resin phase and the mobile solution phase [1] . It has been applied successfully to the separation of isotopes of various elements in ligand exchange systems, in particular, those using hydroxycarboxylates as ligands, such as Ce [1] , Gd [2] , Zn [3,4] , Eu [5,6] , Cu [7,8] and Nd [9–11] and in electron exchange systems such as Eu [12,13] and U [14,15] .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Isotope effects of neodymium in different ligands exchange systems studied by ion exchange displacement chromatography

Ismail

Fawzy

Ahmad

et al. 2013

Journal of Advanced Research

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The isotope effects of neodymium in Nd-glycolate ligand exchange system were studied by using ion exchange chromatography. The separation coefficients of neodymium isotopes, ε’s, were calculated from the observed isotopic ratios at the front and rear boundaries of the neodymium adsorption band. The values of separation coefficients of neodymium isotopes, ε’s, for the Nd-glycolate ligand exchange system were compared with those of Nd-malate and Nd-citrate, which indicated that the isotope effects of neodymium as studied by the three ligands takes the following direction Malate > Citrate > Glycolate. This order agrees with the number of available sites for complexation of each ligand. The values of the plate height, HETP of Nd in Nd-ligand exchange systems were also calculated.

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“…The degree of fractionation of neodymium isotopes takes the order; 150 Nd

Section: Resultssupporting

confidence: 84%

Section: Introductionsupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Isotope effects of neodymium in different ligands exchange systems studied by ion exchange displacement chromatography

Ismail

Fawzy

Ahmad

et al. 2013

Journal of Advanced Research

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“…As noted by both John et al (2007) and Vance (2017, 2018), culture experiments suffer from the drawback that most of the Zn in their media is complexed to an organic ligand, usually EDTA. Experimental evidence suggests that EDTA-bound Zn is isotopically heavier than aqueous free Zn, by about 0.2-0.3‰ (Ban et al, 2002;Ding et al, 2010a;Ding et al, 2010b;Markovic et al, 2017). Given that phytoplankton cells take up the free metal Zn 2+ , any isotope difference between bulk medium and phytoplankton cells may simply reflect this isotope partitioning between different species in the medium, and there may actually be no fractionation upon uptake at ocean-relevant free Zn concentrations (John et al, 2007).…”

Section: Controls On Zinc Isotopes In the Upper Ocean: Within And Beyond The Southern Oceanmentioning

confidence: 99%

Zinc and nickel isotopes in seawater from the Indian Sector of the Southern Ocean: The impact of natural iron fertilization versus Southern Ocean hydrography and biogeochemistry

2019

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The Southern Ocean is the site of 20% of global ocean carbon export, and the origin of water masses that significantly impact the chemistry of the global ocean. Much of the Southern Ocean is a high nutrient low chlorophyll (HNLC) region. Iron is the primary limiting nutrient for phytoplankton growth, and may also be an important control on the biogeochemistry of the water masses emanating from the Southern Ocean. Here we investigate the response of Zn and Ni and their isotopes to natural Fe fertilization from Southern Ocean islands, using samples collected during the KEOPS-2 (Oct-Nov 2011) program in the early austral spring near the Kerguelen plateau, Indian Sector of the Southern Ocean.Zinc and Ni concentrations show depth distributions and relationships to major nutrients that are very similar to published data from the Atlantic sector of the Southern Ocean, away from island fertilization. As in the Atlantic sector, and other regions outside the Southern Ocean, there is a slight minimum in d 66 Zn at about 100-150m depth and a slightly heavier value at the surface. At the KEOPS-2 sites, the light sub-surface Zn isotopes occur at the depth level where measured chl-a has declined to near zero. The heaviest Zn isotope values in either the Atlantic or Indian sectors occur in bottom waters, are associated with samples that show high dissolved Si relative to Zn. These latter represent possible evidence for a heavy input directly to deep water or from sediment, and the Zn-Si-d 66 Zn systematics are consistent with a source in diatom opal. Nickel concentrations show much less variation than those of Zn, with the most depleted surface value only 15-20% lower than those in upwelled deep water in the Southern Ocean. These small variations in Ni concentration are associated with no significant variability in Ni isotopes, as also previously observed in the Atlantic sector.Overall, the key feature of the dataset is the apparent absence of any significant impact of natural Fe fertilization on the distribution of Zn and Ni, with the dominant control being the station location relative to the Polar Front in both the Atlantic and Indian sectors. Zinc and Ni isotopes are invariant in surface waters, whether inside or outside the fertilised zone and whether south or north of the Polar Front.

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“…by EDTA, which is used to buffer the inorganic zinc concentration of the medium; John et al 2007). Zinc-EDTA isotope fractionation is ,0.3% between complexed and Zn 2þ with the zinc-EDTA being isotopically heavy (Ban et al 2002;Ding et al 2010;Marković et al 2017). In seawater, zinc speciation is dominated by its complexation with natural organic ligands (Bruland 1989;Ellwood and van den Berg 2000;Ellwood 2004) with ligand concentrations ranging between 1 and 2 nM.…”

Section: -D Modellingmentioning

confidence: 99%

Some observations on the biogeochemical cycling of zinc in the Australian sector of the Southern Ocean: a dedication to Keith Hunter

Ellwood

Strzepek

Chen

et al. 2020

Mar. Freshwater Res.

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In this study we investigated the distribution of dissolved and particulate zinc (dZn and pZn respectively) and its isotopes in the Subantarctic Zone as part of a Geotraces Process voyage. dZn and pZn depth profiles contrasted each other, with dZn showing depletion within the euphotic zone while pZn profiles showed enrichment. Fitting a power law equation to the pZn profiles produced an attenuation factor of 0.82, which contrasted values for particulate phosphorus, cadmium and copper. The results indicate that zinc has a longer regeneration length scale than phosphorus and cadmium, but shorter than copper. The differential regeneration of pZn relative to that of particulate phosphorus likely explains why dZn appears to have a deeper regeneration profile than that of phosphate. The dZn isotope (d 66 Zn dissolved ) profiles collected across the Subantarctic Zone showed differing profile structures. For one station collected within an isolated cold-core eddy (CCE), d 66 Zn dissolved showed surface enrichment relative to deep waters. The corresponding pZn isotope profiles within the CCE did not show enrichment; rather, they were subtly depleted in surface waters and then converged to similar values at depth. Zinc isotope fractionation can be explained through a combination of fractionation processes associated with uptake by phytoplankton, zinc complexation by natural organic ligands and zinc regeneration from particulate matter.

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Zinc isotope effects by chromatographic chelating exchange resin

Cited by 16 publications

References 26 publications

Isotope effects of neodymium in different ligands exchange systems studied by ion exchange displacement chromatography

Isotope effects of neodymium in different ligands exchange systems studied by ion exchange displacement chromatography

Zinc and nickel isotopes in seawater from the Indian Sector of the Southern Ocean: The impact of natural iron fertilization versus Southern Ocean hydrography and biogeochemistry

Some observations on the biogeochemical cycling of zinc in the Australian sector of the Southern Ocean: a dedication to Keith Hunter

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