Identification of the nitrate contamination sources of the Brusselian sands groundwater body (Belgium) using a dual isotope approach : Isotopes in environmental and health studies

Mattern, Samuel;Sebilo, M.;Vanclooster, Marnik
(2011) Isotopes in Environmental and Health Studies — Vol. 47, n° 3, p. 297-315 (2011)

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Authors
  • Mattern, SamuelUCLouvain
    Author
  • Sebilo, M.UPMC, Université Paris 6
    Author
  • Vanclooster, Marnikorcid-logoUCLouvain
    Author
Abstract
Isotopic fingerprinting is an advanced technique allowing the classification of the nitrate source pollution of groundwater, but needs further development and validation. In this study, we performed measurements of natural stable isotopic composition of nitrate ((15)N and (18)O) in the groundwater body of the Brussels sands (Belgium) and studied the spatial and temporal dynamics of the isotope signature of this aquifer. Potential nitrogen sources sampled in the region had isotopic signatures that fell within the corresponding typical ranges found in the literature. For a few monitoring stations, the isotopic data strongly suggest that the sources of nitrate are from mineral fertiliser origin, as used in agriculture and golf courses. Other stations suggest that manure leaching from unprotected stockpiles in farms, domestic gardening practices, septic tanks and probably cemeteries contribute to the nitrate pollution of this groundwater body. For most monitoring stations, nitrate originates from a mixing of several nitrogen sources. The isotopic signature of the groundwater body was poorly structured in space, but exhibited a clear temporal structure. This temporal structure could be explained by groundwater recharge dynamics and cycling process of nitrogen in the soil-nitrogen pool.
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Mattern, S., Sebilo, M., & Vanclooster, M. (2011). Identification of the nitrate contamination sources of the Brusselian sands groundwater body (Belgium) using a dual isotope approach : Isotopes in environmental and health studies. Isotopes in Environmental and Health Studies, 47(3), 297-315. https://doi.org/10.1080/10256016.2011.604127 (Original work published 2011)