A first inventory of the labile biochemicals found in Avignon groundwater: can we identify potential bacterial substrates?

Groundwater is a major source of water for irrigation of vegetables, especially in the Mediterranean basin. Contamination of aquifer by pathogens has been responsible for numerous disease outbreaks worldwide. Several studies reported that groundwater dissolved organic matter (DOM) can serve as a sou...

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Bibliographic Details
Main Authors: Rousset, Ludivine, Gillon, Marina, Duport, Catherine, Clavel, Thierry, Lagrée, Marie, Traikia, Mounir, Panagiotopoulos, Christos, Berge, Odile
Format: Conference Proceeding
Language:English
Subjects:
Acetic acid
Acidic soils
Acids
Alcohols
Aquifers
Carbohydrates
Contamination
Dissolved organic matter
Energy metabolism
Environment and Society
Environmental Sciences
Esters
Fulvic acids
Groundwater
Irrigation water
Lactic acid
Liquid chromatography
Low level
Magnetic resonance spectroscopy
Mass spectroscopy
Metabolism
Microorganisms
NMR
Nuclear magnetic resonance
Outbreaks
Pathogens
Powder
Soil contamination
Spectroscopy
Spectrum analysis
Substrates
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Summary:Groundwater is a major source of water for irrigation of vegetables, especially in the Mediterranean basin. Contamination of aquifer by pathogens has been responsible for numerous disease outbreaks worldwide. Several studies reported that groundwater dissolved organic matter (DOM) can serve as a source of carbon and energy for heterotrophic metabolism of pathogens. In this study, we aimed to investigate the DOM composition of groundwater collected at Avignon. Six liters of groundwater were filtered (0.2 µm) and freeze-dried following appropriate cleaning procedure. The bulk analyses of powder sample were performed using 1D and 2D nuclear magnetic resonance spectroscopy and liquid chromatography coupled with mass spectroscopy. Several components were found at concentrations around 1 µM and comprise: (i) humic and fulvic acids originated from land-derived material or soils and, (ii) various acids, esters and alcohols of different sizes including acetate, lactate and formate, these may result from microbial metabolism. In conclusion, the Avignon groundwater DOM contains a heterogeneous mixture of dissolved organic components with a rather low potential bioreactivity based on the low level of labile biogeochemicals such as carbohydrates.
ISSN:2267-1242
2555-0403
2267-1242
DOI:10.1051/e3sconf/20198802001