Submitted by Isabelle Dubigeon on Wed, 12/04/2019 - 11:11
The Geohelis platform is a university-certified platform for improving the readability of the institution’s technical resources

This platform brings together a centre of analytical resources devoted to the analysis of major chemical and trace elements (inorganic anions/cations, dissolved carbon) of environmental samples (mainly water but also certain minerals, biological samples, etc.) and a second devoted to the elementary and/or isotopic analysis (radiogenic isotopes) of rocks and/or minerals to study the origin, the history and age of terrestrial rocks and of the associated minerals

Scientific manager of the platform : Marc Poujol with the support of Rémi Marsac
Technical managers of the platform : Martine Bouhnik Le Coz and Nathan Cogné with the technical support of David Vilbert, Dominique Bavay, and Patrice Petitjean.


Skills / Expertise:

  • Dating U-Th-Pb, K-Ar, (U-Th)/He
  • Trace elements analysis by LA-ICP-MS
  • ICP-MS analysis of major element concentrations and traces of dissolved environmental samples.
  • Analysis of dissolved organic carbon concentrations by carbon analyzer (TOC).
  • Analysis of dissolved anion concentrations by ion chromatography.
  • UV spectrophotometry

Accessibility rules

This structure is open to all researchers in the Rennes 1 University constituent units, to research institutions collaborating with these units and, subject to availability, to private partners. All requests must be validated by the instrument engineers. They will assess the feasibility of the analyses and define a schedule based on the requests.

Application sectors and equipment

Chemical (elemental and/or isotopic) analyses of environmental samples (surface water, groundwater, plants, micro-organisms, biogenic samples, etc.) or geological samples (rocks and minerals)
Equipment of the structure
  • Equipment 1: Excimer laser coupled to Q-ICP-MS for elemental or isotopic analysis by in-situ laser ablation and U-Th-Pb dating
  • Equipment 2: Rare Gas Mass Spectrometers (Ar, He) for K-Ar and (U-Th)/He and Solid Source Mass Spectrometer (TIMS) for isotopic analyses (Sm, Nd, Sr, Pb).
  • Equipment 3: Q-ICP-MS for measuring concentrations of major elements and traces of dissolved environmental samples
  • Equipment 4: Two UV-Vis spectrophotometers
  • Equipment 5: Two carbon analyzers (TOC) including one with nitrogen analysis.
  • Equipment 6: Ion chromatography for analysis of dissolved anions.
Isabelle Dubigeon
Wed, 08/19/2020 - 16:02