Eléments traces et nanoparticules

Scientific orientations

The members of this team are interested in the processes and key factors governing the cycle, tracing and transfer mechanisms of metallic trace elements (metals and metalloids) and nano-objects both as contaminants and carrier phases (natural and anthropogenic, inorganic and organic nanoparticles: manufactured NPs, nano-plastics, etc.). Our research topics focus on surface environments (water, soil, watersheds, estuaries, oceans) and their interfaces, including the action of micro-organisms and vegetation. These strategic orientations will structure the core of our research within the framework of this team

Scientific approach

The synergy between chemists, bio-geochemists and geochemists provides the capability to couple field approaches (comprehensive understanding of the environmental parameters) to mechanistic studies of processes via in situ and ex situ experimentation, modeling, tracing and the development of innovative analytical methods (spectroscopic/spectrometric, microfluidic/spectroscopic couplings, etc.).
Examples of tools and methods developed by the members of this team :

  • Experimental systems
    • Experimental system for the in-situ study of the biodissolution of minerals,
    • In-situ sampling system for reoxidation products in soil solutions,
    • Analogue modeling of soil leaching,
    • Culture system for ferro-oxidant bacteria under controlled conditions,
    • Plant cultivation system under hydroponic conditions and on soil.
    • Experimental systems of controlled and chaotic bi- and tri-phasic mixtures
    • Experimental microfluidic systems for the modeling of physical and chemical parameter gradients
  • Geochemical models
    • P2M (PHREEPLOT-PHREEQ-C-Model VI coupling): complexation parameter extrapolation model between organic matter/metals/metalloids (Catrouillet et al., 2014)
    • PHREEQC-Model VI: study model of the interactions and competitions between organic matter, minerals, cations and metalloids (Marsac et al., 2012)
  • Analytical developments
    • SEC/UV/ICP-MS coupling (Al-Sid-Cheikh et al., 2015) and A4F/ICP-MS for the study of contaminants associated with colloidal and nanoparticulate carrier phases
    • A4F coupling to dynamic light scattering for the physico-chemical characterization of anthropogenic nanoparticles (see list of publications below).
    • Coupling of sequential ultrafiltration to remote dynamic light scattering for the detection and physical characterization of trace nanoparticles in complex matrices (see list of publications below).
    • Coupling of Laser Induced Breakdown Detection to separative microfluidics for ultra-trace detection of nanoparticles in natural matrices (Lacune and Lacune-2 Project) (see list of publications below).
    • Coupling of analytical polarography to remote dynamic light scattering for the characterization of the complexing capacity of anthropogenic nanoparticles.
    • NanoSIMS imaging/multivariate analysis coupling to highlight the preferential distribution of trace elements in soil matrices or re-oxidation products (Al-Sid-Cheikh et al., 2015 and Pédrot et al., 2015).

Members NBG