Consulta: subjectFacets:"Zinc isotopes"
Registros recuperados: 2
Data/hora: 13/06/2024 03:30:43

Pervasive sources of isotopically light zinc in the North Atlantic Ocean
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Lemaitre, Nolwenn; De Souza, Gregory F.; Archer, Corey; Wang, Ruo-mei; Planquette, Helene; Sarthou, Geraldine; Vance, Derek.
In this study, we report seawater dissolved zinc (Zn) concentration and isotope composition (Zn) from the GEOTRACES GA01 (GEOVIDE) section in the North Atlantic. Across the transect, three subsets of samples stand out due to their isotopically light signature: those close to the Reykjanes Ridge, those close to the sediments, and those, pervasively, in the upper ocean. Similar to observations at other locations, the hydrothermal vent of the Reykjanes Ridge is responsible for the isotopically light Zn composition of the surrounding waters, with an estimated source Zn of -0.42 ‰. This isotopically light Zn is then transported over a distance greater than 1000 km from the vent. Sedimentary inputs are also evident all across the trans-Atlantic section,...
Tipo: Text
Palavras-chave: Zinc isotopes; North Atlantic; Zinc sources; GEOTRACES; GEOVIDE.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00618/73035/72166.pdf

Determining sedimentary material sources in a Brazilian urban lake using Zn stable isotope compositions of bottom sediments: a preliminary study
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Ferreira Araujo, Daniel; Boaventura, Geraldo; Mulholland, Daniel; Garnier, Jeremie; Machado, Wilson; Babinski, Marly; Dantas, Elton.
Zinc isotopes ratios provide qualitative and quantitative information about contributions from different Zn sources in the environment. Here we present the results of a preliminary study to identify the main sources controlling Zn isotope signatures of sediments from Lake Paranoá (Brazil), an urban water reservoir. The Zn isotope ratios were measured by MC-ICP-MS and expressed as δ66/64Zn notation relative to the JMC 3-0749-L solution. The studied sediments showed a narrow isotopic range (+0.00 to +0.13 ‰; n = 10) similar to that reported for intensely weathered soils worldwide (from -0.4 to +0.2‰). The geoaccumulation index (Igeo) also suggests low or negligible influence of Zn anthropogenic source. This research provides a baseline assessment of the Zn...
Tipo: Text
Palavras-chave: Stable isotopes; MC-ICP-MS; Mass spectrometry; Environmental pollution; Metal contamination; Weathering; Zinc isotopes.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00666/77763/79899.pdf