ECOTECH - Production durable et technologies de l'environnement

Enhanced Raman scattering for aquatic media: a new technology for on-site analysis – REMANTAS

The innovative aspect of this proposal lies in the coupling of a (bio)chemical sensor, able to preconcentrate selected contaminants in water, to Surface Enhanced Raman Scattering (SERS), selected for its qualitative and quantitative analytical performance. The development of sensitive, reproducible SERS sensors is one of the project's scientific challenges. Metal nano-structures of controlled size and shape will be obtained through the use of electron beam lithography, so as to meet this challenge. The development of stable molecular layers responsible for “selective” interaction with analytes via organic molecules (aromatic rings, pi-pi stacking) and/or biological molecules (antibodies) will also be a major focal point of the research.
The analytical tool will integrate the SERS sensor, the transducer that will detect and quantify organic substances present by Surface Enhanced Raman Scattering, a data analysis and chemometric interpretation system and a results archiving system.
The system will be deployed on sites of interest to assess the reliability and cost-effectiveness of the analytical tool developed in comparison to reference methods. This study will be conducted by BRGM, Cedre and Ifremer respectively in fresh ground waters, sea water and coastal waters. The system will also be tested for use in the event of pollutant spills.
The analytical tool developed will enable a better estimation of the spatial and temporal variability of water contaminants. In the long term, it could support decision-making by public authorities in the event of a spill, whereby response time is of vital importance.

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Submission summary

The latest European regulations (Directives 2000/60/EC, 2006/118/EC and 2006/11/EC) on water quality aim to achieve good ecological and chemical status for water bodies by 2015. To ensure water surveillance (fresh, surface, ground, coastal and transitional waters), a measurement network has been set up to conduct sustainable monitoring of aquatic environments, in particular to assess the impacts of human activities generating industrial and agricultural pollutant emissions.
The most common approach to contaminant measurements consists of sporadic sampling followed by laboratory analysis. This approach remains unsatisfactory for several reasons. First, it is costly as it requires time and human resources. Secondly, sample contamination, a frequent occurrence due to adsorption onto sampling tubes, distorts the quantities present in samples. Furthermore, changes in temperature, pressure and CO2 and O2 content cause alterations in pH, redox potential and species status. In addition to these factors, microbial activity during sampling and the transport of samples can also affect the speciation of original samples. In difficult access areas, the large sample volume required can sometimes be prohibitive.
The REMANTAS project aims to overcome this obstacle of environmental metrology by developing an original field measurement chain for the detection of organic contaminants in aquatic environments (seawater and freshwater) and testing its deployment through validation trials. The targeted substances, 3 PAHs (naphtalene, fluoranthene and benzo[a]pyrene), 3 chlorinated solvents (chloroethylene, trichloromethane and 1,2-dichloroethane) and 4 BTEX (benzene, toluene, ethylbenzene and xylene), figure on the list of priority substances under the Water Framework Directive 2000/60/EC and/or on the list of the 100 chemicals most transported by sea.
The innovative aspect of this proposal lies in the coupling of a (bio)chemical sensor, able to preconcentrate selected contaminants in water, to Surface Enhanced Raman Scattering (SERS), selected for its qualitative and quantitative analytical performance. The development of sensitive, reproducible SERS sensors is one of the project's scientific challenges. Metal nano-structures of controlled size and shape will be obtained through the use of electron beam lithography, so as to meet this challenge. The development of stable molecular layers responsible for “selective” interaction with analytes via organic molecules (aromatic rings, pi-pi stacking) and/or biological molecules (antibodies) will also be a major focal point of the research.
The analytical tool will integrate the SERS sensor, the transducer that will detect and quantify organic substances present by Surface Enhanced Raman Scattering, a data analysis and chemometric interpretation system and a results archiving system.
The system will be deployed on sites of interest to assess the reliability and cost-effectiveness of the analytical tool developed in comparison to reference methods. This study will be conducted by BRGM, Cedre and Ifremer respectively in fresh ground waters, sea water and coastal waters. The system will also be tested for use in the event of pollutant spills.
The analytical tool developed will enable a better estimation of the spatial and temporal variability of water contaminants. In the long term, it could support decision-making by public authorities in the event of a spill, whereby response time is of vital importance.

Project coordinator

Monsieur Emmanuel RINNERT (INSTITUT FRANCAIS DE RECHERCHE POUR L'EXPLOITATION DE LA MER (IFREMER)) – emmanuel.rinnert@ifremer.fr

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

HORIBA Scientific HORIBA JOBIN YVON SAS
CEDRE CENTRE DE DOCUMENTATION DE RECHERCHE ET D'EXPERIMENTATIONS SUR LES POLLUTIONS ACCIDENTELLES DES EAUX [CEDRE]
UTT / ICD / LNIO UNIVERSITE DE TECHNOLOGIE DE TROYES
BRGM BUREAU DE RECHERCHES GEOLOGIQUES ET MINIERES - BRGM
Université de Paris XIII UNIVERSITE DE PARIS XIII
IFREMER INSTITUT FRANCAIS DE RECHERCHE POUR L'EXPLOITATION DE LA MER (IFREMER)

Help of the ANR 1,084,164 euros
Beginning and duration of the scientific project: December 2011 - 48 Months

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