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The suitability of the isotope (79)Br in the bromide form as hydrological tracer of groundwater movement was evaluated on the basis of field and flow through column studies. Laboratory scale infiltration experiments using cylinders cored from granite, and repacked columns of crushed granite showed that the change of the natural isotopic ratio (79)Br/(81)Br with time can be used to monitor the tracer breakthrough. Comparison was made with other nonsorbing tracers, such as tritiated water chloride and iodide. The difference in travel time of halides was found to be related to the solute size. A (79)Br migration test in crystalline rock was carried out between two boreholes interconnected by a low permeability fracture. A hydraulic gradient was imposed lowering the static level in the arrival well by pumping.

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Authors: D'ALESSANDRO M, JRC Ispra (IT);BIDOGLIO G, JRC Ispra (IT);MOUSTY F, JRC Ispra (IT);SALA BENITO, JRC Ispra (IT);YLLERADE LLANO A, Centro de Investigaciones EnergéticasMedioambientales y Tecnólogicas, División de Técnicas Geológicas, Madrid (ES)
Bibliographic Reference: Article: Journal of Hydrology
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