Consulta: creatorFacets:"Machado, Wilson"
Registros recuperados: 2
Data/hora: 13/06/2024 02:45:53

Zinc isotopes as tracers of anthropogenic sources and biogeochemical processes in contaminated mangroves
Provedor de dados: 5
Autores: Ferreira Araujo, Daniel; Machado, Wilson; Weiss, Dominik; Mulholland, Daniel S.; Garnier, Jeremie; Souto-oliveira, Carlos E.; Babinski, Marly.
Recent work has shown that variations in zinc (Zn) isotope ratios enable us to identify contamination sources in the terrestrial environment and uptake processes in higher plants. Here in this study, we demonstrate that this also holds true for mangrove forests, which play an important role in the biogeochemical cycling of metals in tropical coastal ecosystems and that are seriously threatened by anthropogenic pollution. To this end, we determined zinc concentration and isotope composition (expressed using the δ66Zn notation relative to the JMC 3-0749-L standard) in sediments and tree leaves collected from a mangrove close to Rio de Janeiro in Brazil. The δ66ZnJMC values of sediments vary between +0.36 and + 0.84‰ and fall on a mixing line between detrital...
Tipo: Text
Palavras-chave: Metal transition isotopes; Metal contamination; Mass spectrometry; Coastal ecosystems; Mangrove leaves.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00440/55196/56660.pdf

Determining sedimentary material sources in a Brazilian urban lake using Zn stable isotope compositions of bottom sediments: a preliminary study
Provedor de dados: 5
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