Passive Sampling for Accurate 87Sr/86Sr Isotope Ratio Analysis by MC-ICP-MS in Amazonian Rivers

Antonia Siebenbrunner; Stefan Wagner; Amauri Antonio Menegário; Thomas Prohaska; José Lucas Martins Viana; Luiz Felipe Pompeu Prado Moreira; Ézio Sargentini Jr.; Johanna Irrgeher

Passive Sampling for Accurate ⁸⁷Sr/⁸⁶Sr Isotope Ratio Analysis by MC-ICP-MS in Amazonian Rivers

Antonia Siebenbrunner
, Stefan Wagner
, Amauri Antonio Menegário
, Thomas Prohaska
, José Lucas Martins Viana
, Luiz Felipe Pompeu Prado Moreira
, Ézio Sargentini Jr.
, Johanna Irrgeher

São Paulo State University (UNESP)
Instituto Nacional de Pesquisas da Amazônia (INPA)

Research output: Contribution to conference › Abstract › peer-review

Abstract

The Amazon river basin presents challenging conditions for strontium (Sr) isotope ratio analysis due to extremely low Sr concentrations, high Rb/Sr ratios, and low ionic strength. This contribution applies a diffusive gradients in thin films (DGT) passive sampling method to assess Sr concentrations and ⁸⁷Sr/⁸⁶Sr isotope ratios in Amazonian rivers. Laboratory tests and in situ deployments in the Rio Negro, Solimões, and Amazon River show that DGT enables accurate Sr quantification and ⁸⁷Sr/⁸⁶Sr isotope ratio assessment, achieving up to 16-fold Sr preconcentration without inducing detectable isotopic fractionation. The method captures large spatial and seasonal
⁸⁷Sr/⁸⁶Sr isotope ratio variability linked to Amazon basin geodiversity. Binary mixing at the confluence of Rio Negro and Solimões was confirmed. DGT passive sampling proved to be a robust tool for ⁸⁷Sr/⁸⁶Sr analysis in dynamic freshwater environments, even under extreme hydrochemical conditions.

Original language	English
Publication status	Published - 30 Jan 2026
Event	57th Annual Conference of the DGMS: Including ICP-MS User's Meeting - University of Leipzig, Leipzig, Germany Duration: 10 Mar 2026 → 13 Mar 2026 https://dgms-conference.com/

Conference

Conference	57th Annual Conference of the DGMS
Country/Territory	Germany
City	Leipzig
Period	10/03/26 → 13/03/26
Internet address	https://dgms-conference.com/

Passive Sampling for Accurate ⁸⁷Sr/⁸⁶Sr Isotope Ratio Analysis by MC-ICP-MS in Amazonian Rivers
Siebenbrunner, A., Wagner, S., Menegário, A. A., Prohaska, T., Viana, J. L. M., Pompeu Prado Moreira, L. F., Sargentini Jr., É. & Irrgeher, J., Mar 2026.
Research output: Contribution to conference › Poster › Research › peer-review

57th Annual Conference of the DGMS
Wagner, S. (Invited speaker), Irrgeher, J. (Chair of meeting), Siebenbrunner, A. (Speaker) & Trimmel, S. (Speaker)
10 Mar 2026 → 13 Mar 2026
Activity: Participating in or organising an event › Participation in conference

Cite this

@conference{8017aa20b8e3443d9305447aa9e0029f,

title = "Passive Sampling for Accurate 87Sr/86Sr Isotope Ratio Analysis by MC-ICP-MS in Amazonian Rivers",

abstract = "The Amazon river basin presents challenging conditions for strontium (Sr) isotope ratio analysis due to extremely low Sr concentrations, high Rb/Sr ratios, and low ionic strength. This contribution applies a diffusive gradients in thin films (DGT) passive sampling method to assess Sr concentrations and 87Sr/86Sr isotope ratios in Amazonian rivers. Laboratory tests and in situ deployments in the Rio Negro, Solim{\~o}es, and Amazon River show that DGT enables accurate Sr quantification and 87Sr/86Sr isotope ratio assessment, achieving up to 16-fold Sr preconcentration without inducing detectable isotopic fractionation. The method captures large spatial and seasonal 87Sr/86Sr isotope ratio variability linked to Amazon basin geodiversity. Binary mixing at the confluence of Rio Negro and Solim{\~o}es was confirmed. DGT passive sampling proved to be a robust tool for 87Sr/86Sr analysis in dynamic freshwater environments, even under extreme hydrochemical conditions.",

author = "Antonia Siebenbrunner and Stefan Wagner and Meneg{\'a}rio, \{Amauri Antonio\} and Thomas Prohaska and Viana, \{Jos{\'e} Lucas Martins\} and \{Pompeu Prado Moreira\}, \{Luiz Felipe\} and \{Sargentini Jr.\}, {\'E}zio and Johanna Irrgeher",

year = "2026",

month = jan,

day = "30",

language = "English",

note = "57th Annual Conference of the DGMS ; Conference date: 10-03-2026 Through 13-03-2026",

url = "https://dgms-conference.com/",

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TY - CONF

T1 - Passive Sampling for Accurate 87Sr/86Sr Isotope Ratio Analysis by MC-ICP-MS in Amazonian Rivers

AU - Siebenbrunner, Antonia

AU - Wagner, Stefan

AU - Menegário, Amauri Antonio

AU - Prohaska, Thomas

AU - Viana, José Lucas Martins

AU - Pompeu Prado Moreira, Luiz Felipe

AU - Sargentini Jr., Ézio

AU - Irrgeher, Johanna

PY - 2026/1/30

Y1 - 2026/1/30

N2 - The Amazon river basin presents challenging conditions for strontium (Sr) isotope ratio analysis due to extremely low Sr concentrations, high Rb/Sr ratios, and low ionic strength. This contribution applies a diffusive gradients in thin films (DGT) passive sampling method to assess Sr concentrations and 87Sr/86Sr isotope ratios in Amazonian rivers. Laboratory tests and in situ deployments in the Rio Negro, Solimões, and Amazon River show that DGT enables accurate Sr quantification and 87Sr/86Sr isotope ratio assessment, achieving up to 16-fold Sr preconcentration without inducing detectable isotopic fractionation. The method captures large spatial and seasonal 87Sr/86Sr isotope ratio variability linked to Amazon basin geodiversity. Binary mixing at the confluence of Rio Negro and Solimões was confirmed. DGT passive sampling proved to be a robust tool for 87Sr/86Sr analysis in dynamic freshwater environments, even under extreme hydrochemical conditions.

AB - The Amazon river basin presents challenging conditions for strontium (Sr) isotope ratio analysis due to extremely low Sr concentrations, high Rb/Sr ratios, and low ionic strength. This contribution applies a diffusive gradients in thin films (DGT) passive sampling method to assess Sr concentrations and 87Sr/86Sr isotope ratios in Amazonian rivers. Laboratory tests and in situ deployments in the Rio Negro, Solimões, and Amazon River show that DGT enables accurate Sr quantification and 87Sr/86Sr isotope ratio assessment, achieving up to 16-fold Sr preconcentration without inducing detectable isotopic fractionation. The method captures large spatial and seasonal 87Sr/86Sr isotope ratio variability linked to Amazon basin geodiversity. Binary mixing at the confluence of Rio Negro and Solimões was confirmed. DGT passive sampling proved to be a robust tool for 87Sr/86Sr analysis in dynamic freshwater environments, even under extreme hydrochemical conditions.

M3 - Abstract

T2 - 57th Annual Conference of the DGMS

Y2 - 10 March 2026 through 13 March 2026

ER -

Passive Sampling for Accurate 87Sr/86Sr Isotope Ratio Analysis by MC-ICP-MS in Amazonian Rivers

Abstract

Conference

Research output