The institute
FEMTO's news

You are here

An innovative solution to detect pollutants in the subsoil

Researchers from FEMTO-STinstitute and the company TOTAL SA have succeeded in detecting organic pollutants with methods that did not require sampling and have been able to monitor the evolution of the pollution of the subsoil over periods ranging up to several years.

This challenge was made possible thanks to the development of autonomous and wireless sensors capable of detecting hydrogen sulfide through a layer of sand. These results have just been published in the journal ACS Sensors.

 Soil pollution, especially in basements, is a major environmental issue. This problem is very significant in areas that have been occupied for years by human activities, particularly for industrial sites. Numerous standards have been put in place to fight against this scourge, which can have consequences on groundwater  and on the reuse of this land for new activities (construction, agricultural land, etc.).

The main challenge in monitoring basement pollution is to observe over long periods, up to several years, the evolution of pollution in the in the subsoil. The current principle is based on sampling at regular intervals via a triptych of field sampling-extraction-analysis. This strategy is effective in terms of analysis (detection threshold, composition, etc.) but is time-consuming and costly.

As part of a collaborative research project undertaken with funding from the French National Research Agency (UNDERGROUND project ANR-17-CE24-0037), researchers from the FEMTO-ST Institute (CNRS/Université de Franche-Comté/École Nationale Supérieure de Mécanique et des Microtechnologies de Besançon) and the company TOTAL SA have developed a new generation of sensors which can detect a very harmful pollutant, hydrogen sulphide, H2S, through a layer of sand. For this purpose, they have developed on the one hand wireless elastic wave sensors sensitive to H2S and on the other hand they have optimized the interrogation system to be able to follow the pollution of the subsoil through a layer of sand.

The starting point for this study is the use of sensors using surface elastic waves (SAW) because these transducers are passive and can be interrogated wirelessly: they do not require a local power source to operate and they can be interrogated remotely by a radio wave. They are therefore ideal for use underground. In addition, ground penetrating RADAR (GPR) is known to be a powerful tool for the geological analysis of subsoils. However, the performance of this type of GPR is not adapted to detect chemical species. Thus, researchers at the FEMTO-ST Institute, specialists in electronics and time-frequency, have modified a commercial GPR to give it the ability to interrogate SAW sensors.  In parallel, chemists at FEMTO-ST have developed a coordination polymer whose mechanical properties are modified by a specific reaction with H2S, thus enabling H2S detection by surface acoustic waves (SAW). This polymer is also compatible with collective manufacturing processes used in the MIMENTO clean room of FEMTO-ST (RENATECH national network).

https://pubs.acs.org/doi/abs/10.1021/acssensors.0c00013

Contacts :
Frédéric Chérioux
Jean-Michel Friedt

 

  • Detecting problems of the anti-bleeding system of patients in 60 minutes

    Researchers from FEMTO-ST institue and the Universitiy of Geneva  have developed an innovative device that investigates a patient’s platelet capacity in near real-life conditions so that bleeding can be stopped.

    Read more
  • Focus on the european MiMédi project

    On Tuesday 11 June 2019, the teams of the FEMTO-ST Institute and the EFS Bourgogne-Franche-Comté will present, in the presence of representatives of the regional district, an important European research project on regional smart specialisation.  Bringing together 10 industrial and academic partne

    Read more
  • Closure of the S3-4AlpClusters project

    The final conference of the S3-4AlpClusters project was held in Venice on the 13th and 14th of March, in attendance of all the partners (including FEMTO-ST), observers, policy makers and members of the European Commission.

    Read more
  • The W. G. Cady Prize awarded to Serge GALLIOU at the IEEE IFCS 2019

    This award recognizes Serge Galliou's exceptional and pioneering contributions in the development of cryogenic acoustic resonators with extremely high quality factors (very low mechanical losses) for sensor, oscillator or fundamental physics applications.

    Read more
  • Two CNRS bronze medals for FEMTO-ST

    Aude Bolopion (biomedical micro-nano robotics) and Nadia Steiner (fuel cell diagnostics) are awarded with the CNRS 2019 bronze medal for their promising research.

    Each year, the CNRS bronze medals welcome some 40 young scientists whose career start is extremely promising

    Read more
  • Best student paper award for Rémi Meyer

    Remi Meyer got the best student presentation award at SPIE-Photonics West conference for his work on ultra-high aspect ratio Bessel beams. Shaping the beam of ultrafast lasers has become now an essential tool for ultra-high intensity laser-matter interaction.

    Read more
  • Visit of the CNRS President to FEMTO-ST

    Antoine Petit, CEO of the CNRS, was welcomed on February 11th at FEMTO-ST.

     

    Read more
  • Photo John Dudley

    John Dudley awarded by the international Society of Optics and Photonics (SPIE)

    He obtains  the "SPIE Harold E. Edgerton" Award 2019 for pioneering applications based on ultra-short light pulses in optical fibers.

    Read more
  • Award "innovation in optomechatronic research"

    Several members of different scientific departments of FEMTO-ST were rewarded for their joint paper "Photonic microsystem made by dynamic microassembly" at the ISOT conference "19th International Symposium on Optomechatronic Technology" which took place from November 5 to 8 in Cancun

    Read more
  • Entrepreneurs-PhD Award : Second place for Vladimir Gauthier at the national level

    Awarded for his « CellSelect project » he proposes a robot capable of improving the precision and speed of cell sorting in the field of innovative therapies.

    His work is the result of research carried out of Biomedical Microrobotics Team of FEMTO-ST Institute.

    Read more

Pages