DETERMINING SEDIMENTARY MATERIAL SOURCES IN A BRAZILIAN URBAN LAKE USING Zn STABLE ISOTOPE COMPOSITIONS OF BOTTOM SEDIMENTS: A PRELIMINARY STUDY

  • Daniel Ferreira Araújo Ifremer
  • Geraldo Resende Boaventura Universidade de Brasília
  • Daniel Santos Mulholland Universidade Federal de Tocantis
  • Jeremie Garnier Universidade de Brasília
  • Wilson Machado Universidade Federal Fluminense
  • Marly Babinski Universidade de São Paulo
  • Elton Luiz Dantas Universidade de Brasília

Abstract

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 isotopes signatures in lake sedimentary environments under the influence of these weathered soils.

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Published
21-12-2020
How to Cite
Araújo, D. F., Boaventura, G. R., Mulholland, D. S., Garnier, J., Machado, W., Babinski, M., & Dantas, E. L. (2020). DETERMINING SEDIMENTARY MATERIAL SOURCES IN A BRAZILIAN URBAN LAKE USING Zn STABLE ISOTOPE COMPOSITIONS OF BOTTOM SEDIMENTS: A PRELIMINARY STUDY. Geochimica Brasiliensis, 34(2), 130-137. https://doi.org/10.21715/GB2358-2812.2020342130
Section
Articles